Test your AI Agents with the all-new Agent to Agent Testing Platform.Learn More

How to use rescaledSignificand method in fast-check-monorepo

Best JavaScript code snippet using fast-check-monorepo

DoubleHelpers.spec.ts

1import * as fc from 'fast-check';2import { float64raw, isStrictlySmaller } from '../../__test-helpers__/FloatingPointHelpers';3import {4  decomposeDouble,5  doubleToIndex,6  indexToDouble,7} from '../../../../../src/arbitrary/_internals/helpers/DoubleHelpers';8type Index = ReturnType<typeof doubleToIndex>;9const toIndex = (raw: bigint | string): Index => {10  const b = typeof raw === 'string' ? BigInt(raw) : raw;11  const pb = b < BigInt(0) ? -b : b;12  return { sign: b < BigInt(0) ? -1 : 1, data: [Number(pb >> BigInt(32)), Number(pb & BigInt(0xffffffff))] };13};14const toBigInt = (index: Index): bigint => {15  return BigInt(index.sign) * ((BigInt(index.data[0]) << BigInt(32)) + BigInt(index.data[1]));16};17describe('decomposeDouble', () => {18  it('should properly decompose basic values', () => {19    expect(decomposeDouble(0)).toEqual({ exponent: -1022, significand: 0 });20    expect(decomposeDouble(1)).toEqual({ exponent: 0, significand: 1 });21    expect(decomposeDouble(128)).toEqual({ exponent: 7, significand: 1 });22    expect(decomposeDouble(201)).toEqual({ exponent: 7, significand: 1.5703125 });23  });24  it('should properly decompose negative values', () => {25    expect(decomposeDouble(-0)).toEqual({ exponent: -1022, significand: -0 });26    expect(decomposeDouble(-1)).toEqual({ exponent: 0, significand: -1 });27  });28  it('should properly decompose extreme values', () => {29    expect(decomposeDouble(Number.MAX_VALUE)).toEqual({ exponent: 1023, significand: 2 - Number.EPSILON });30    expect(decomposeDouble(Number.MIN_VALUE)).toEqual({ exponent: -1022, significand: Number.EPSILON });31    expect(decomposeDouble(Number.EPSILON)).toEqual({ exponent: -52, significand: 1 });32    expect(decomposeDouble(1 + Number.EPSILON)).toEqual({ exponent: 0, significand: 1 + Number.EPSILON });33  });34  it('should decompose a 64-bit float into its equivalent (significand, exponent)', () => {35    fc.assert(36      fc.property(float64raw(), (f64) => {37        // Arrange38        fc.pre(!Number.isNaN(f64));39        // Act40        const { exponent, significand } = decomposeDouble(f64);41        // Assert42        expect(significand * 2 ** exponent).toBe(f64);43      })44    );45  });46});47describe('doubleToIndex', () => {48  it('should always produce well-formed indexes', () => {49    fc.assert(50      fc.property(float64raw(), (d) => {51        // Arrange52        fc.pre(!Number.isNaN(d));53        // Act54        const index = doubleToIndex(d);55        // Assert56        expect(index.data[0]).toBeGreaterThanOrEqual(0);57        expect(index.data[0]).toBeLessThanOrEqual(0xffffffff);58        expect(Number.isInteger(index.data[0])).toBe(true);59        expect(index.data[1]).toBeGreaterThanOrEqual(0);60        expect(index.data[1]).toBeLessThanOrEqual(0xffffffff);61        expect(Number.isInteger(index.data[1])).toBe(true);62      })63    );64  });65  if (typeof BigInt === 'undefined') {66    it('no test', () => {67      expect(true).toBe(true);68    });69    return;70  } // Following tests require BigInt to be launched71  it('should properly compute indexes', () => {72    expect(doubleToIndex(0)).toEqual(toIndex('0'));73    expect(doubleToIndex(Number.MIN_VALUE)).toEqual(toIndex('1'));74    expect(doubleToIndex(2 * Number.MIN_VALUE)).toEqual(toIndex('2'));75    expect(doubleToIndex(3 * Number.MIN_VALUE)).toEqual(toIndex('3'));76    // Last double with minimal exponent, ie -102277    // index(last with min exponent) = 2**53 - 178    expect(doubleToIndex(2 ** -1022 * (2 - Number.EPSILON))).toEqual(toIndex('9007199254740991'));79    // First double without minimal exponent, ie -102280    // index(first without min exponent) = index(last with min exponent) + 181    expect(doubleToIndex(2 ** -1021)).toEqual(toIndex('9007199254740992'));82    // Number.EPSILON === 1. * 2**-52 --> m = 1, e = -5283    // index(Number.EPSILON) = 2**53 + (-52 - (-1022) -1) * 2**5284    expect(doubleToIndex(Number.EPSILON)).toEqual(toIndex('4372995238176751616'));85    // index(1 - Number.EPSILON / 2) = index(1) - 186    expect(doubleToIndex(1 - Number.EPSILON / 2)).toEqual(toIndex('4607182418800017407'));87    // 1 === 1. * 2**0 --> m = 1, e = 088    // index(1) = 2**53 + (0 - (-1022) -1) * 2**5289    expect(doubleToIndex(1)).toEqual(toIndex('4607182418800017408'));90    // index(1 + Number.EPSILON) = index(1) + 191    expect(doubleToIndex(1 + Number.EPSILON)).toEqual(toIndex('4607182418800017409'));92    // index(2 - Number.EPSILON) = index(2) - 1 = index(1 + (2 ** 52 - 1) * Number.EPSILON)93    expect(doubleToIndex(2 - Number.EPSILON)).toEqual(toIndex('4611686018427387903'));94    // 1 === 1. * 2**1 --> m = 1, e = 195    // index(2) = index(1) + 2**5296    expect(doubleToIndex(2)).toEqual(toIndex('4611686018427387904'));97    // Number.MAX_VALUE === (1 + (2**52-1)/2**52) * 2**1023 --> m = 1 + (2**52-1)/2**52, e = 102398    // index(Number.MAX_VALUE) = index(next(Number.MAX_VALUE)) -1 = 2**53 + (1024 - (-1022) -1) * 2**52 -199    expect(doubleToIndex(Number.MAX_VALUE)).toEqual(toIndex('9218868437227405311'));100  });101  it('should properly compute negative indexes', () => {102    expect(doubleToIndex(-0)).toEqual(toIndex('-1'));103    expect(doubleToIndex(-Number.MIN_VALUE)).toEqual(toIndex('-2'));104    expect(doubleToIndex(-Number.MAX_VALUE)).toEqual(toIndex('-9218868437227405312'));105  });106  it('should properly compute indexes for infinity', () => {107    expect(doubleToIndex(Number.NEGATIVE_INFINITY)).toEqual(108      toIndex(toBigInt(doubleToIndex(-Number.MAX_VALUE)) - BigInt(1))109    );110    expect(doubleToIndex(Number.POSITIVE_INFINITY)).toEqual(111      toIndex(toBigInt(doubleToIndex(Number.MAX_VALUE)) + BigInt(1))112    );113  });114  it('should be able to infer index for negative double from the positive one', () => {115    fc.assert(116      fc.property(float64raw(), (d) => {117        // Arrange118        fc.pre(!Number.isNaN(d));119        const posD = d > 0 || 1 / d > 0 ? d : -d;120        // Act121        const bigIntIndexPos = toBigInt(doubleToIndex(posD));122        const bigIntIndexNeg = toBigInt(doubleToIndex(-posD));123        // Assert124        expect(bigIntIndexNeg).toEqual(-bigIntIndexPos - BigInt(1));125      })126    );127  });128  it('should return index +1 for the successor of a given double', () => {129    fc.assert(130      fc.property(131        fc.integer({ min: -1022, max: +1023 }),132        fc.integer({ min: 0, max: 2 ** 53 - 1 }),133        (exponent, rescaledSignificand) => {134          // Arrange135          fc.pre(exponent === -1022 || rescaledSignificand >= 2 ** 52); // valid136          fc.pre(exponent !== 1023 || rescaledSignificand !== 2 ** 53 - 1); // not max137          const current = rescaledSignificand * Number.EPSILON * 2 ** exponent;138          const next = (rescaledSignificand + 1) * Number.EPSILON * 2 ** exponent;139          // Act140          const bigIntIndexCurrent = toBigInt(doubleToIndex(current));141          const bigIntIndexNext = toBigInt(doubleToIndex(next));142          // Assert143          expect(bigIntIndexNext).toEqual(bigIntIndexCurrent + BigInt(1));144        }145      )146    );147  });148  it('should preserve ordering between two doubles', () => {149    fc.assert(150      fc.property(float64raw(), float64raw(), (fa64, fb64) => {151        // Arrange152        fc.pre(!Number.isNaN(fa64) && !Number.isNaN(fb64));153        // Act / Assert154        if (isStrictlySmaller(fa64, fb64)) {155          expect(toBigInt(doubleToIndex(fa64))).toBeLessThan(toBigInt(doubleToIndex(fb64)));156        } else {157          expect(toBigInt(doubleToIndex(fa64))).toBeGreaterThanOrEqual(toBigInt(doubleToIndex(fb64)));158        }159      })160    );161  });162});163describe('indexToDouble', () => {164  it('Should reverse doubleToIndex', () =>165    fc.assert(166      fc.property(float64raw(), (f64) => {167        fc.pre(!Number.isNaN(f64));168        expect(indexToDouble(doubleToIndex(f64))).toBe(f64);169      })170    ));171  if (typeof BigInt === 'undefined') {172    it('no test', () => {173      expect(true).toBe(true);174    });175    return;176  } // Following tests require BigInt to be launched177  it('should properly find doubles corresponding to well-known values', () => {178    expect(indexToDouble(toIndex('-9218868437227405313'))).toBe(Number.NEGATIVE_INFINITY);179    expect(indexToDouble(toIndex('-9218868437227405312'))).toBe(-Number.MAX_VALUE);180    expect(indexToDouble(toIndex('-1'))).toBe(-0);181    expect(indexToDouble(toIndex('0'))).toBe(0);182    expect(indexToDouble(toIndex('4372995238176751616'))).toBe(Number.EPSILON);183    expect(indexToDouble(toIndex('9218868437227405311'))).toBe(Number.MAX_VALUE);184    expect(indexToDouble(toIndex('9218868437227405312'))).toBe(Number.POSITIVE_INFINITY);185  });186  it('should be reversed by doubleToIndex', () => {187    fc.assert(188      fc.property(189        fc.bigInt({ min: BigInt('-9218868437227405313'), max: BigInt('9218868437227405312') }),190        (bigIntIndex) => {191          // The test below checks that indexToDouble(doubleToIndex) is identity192          // It does not confirm that doubleToIndex(indexToDouble)) is identity193          // Arrange194          const index = toIndex(bigIntIndex);195          // Act / Assert196          expect(doubleToIndex(indexToDouble(index))).toEqual(index);197        }198      )199    );200  });...

FloatHelpers.spec.ts

Source: FloatHelpers.spec.ts

1import * as fc from 'fast-check';2import {3  float32raw,4  isNotNaN32bits,5  isStrictlySmaller,6  isFiniteNotNaN32bits,7} from '../../__test-helpers__/FloatingPointHelpers';8import {9  decomposeFloat,10  EPSILON_32,11  floatToIndex,12  indexToFloat,13  MAX_VALUE_32,14  MIN_VALUE_32,15} from '../../../../../src/arbitrary/_internals/helpers/FloatHelpers';16describe('decomposeFloat', () => {17  it('should properly decompose basic values', () => {18    expect(decomposeFloat(0)).toEqual({ exponent: -126, significand: 0 });19    expect(decomposeFloat(1)).toEqual({ exponent: 0, significand: 1 });20    expect(decomposeFloat(128)).toEqual({ exponent: 7, significand: 1 });21    expect(decomposeFloat(201)).toEqual({ exponent: 7, significand: 1.5703125 });22  });23  it('should properly decompose negative values', () => {24    expect(decomposeFloat(-0)).toEqual({ exponent: -126, significand: -0 });25    expect(decomposeFloat(-1)).toEqual({ exponent: 0, significand: -1 });26  });27  it('should properly decompose extreme values', () => {28    expect(decomposeFloat(MAX_VALUE_32)).toEqual({ exponent: 127, significand: 1 + (2 ** 23 - 1) / 2 ** 23 });29    expect(decomposeFloat(MIN_VALUE_32)).toEqual({ exponent: -126, significand: 2 ** -23 });30    expect(decomposeFloat(EPSILON_32)).toEqual({ exponent: -23, significand: 1 });31    expect(decomposeFloat(1 + EPSILON_32)).toEqual({ exponent: 0, significand: 1 + 2 ** -23 });32  });33  it('should decompose a 32-bit float into its equivalent (significand, exponent)', () => {34    fc.assert(35      fc.property(float32raw(), (f32) => {36        // Arrange37        fc.pre(isFiniteNotNaN32bits(f32));38        // Act39        const { exponent, significand } = decomposeFloat(f32);40        // Assert41        expect(significand * 2 ** exponent).toBe(f32);42      })43    );44  });45});46describe('floatToIndex', () => {47  it('should properly compute indexes', () => {48    expect(floatToIndex(0)).toBe(0);49    expect(floatToIndex(MIN_VALUE_32)).toBe(1);50    expect(floatToIndex(2 * MIN_VALUE_32)).toBe(2);51    expect(floatToIndex(3 * MIN_VALUE_32)).toBe(3);52    // EPSILON_32 === 1. * 2**-23 --> m = 1, e = -2353    // index(EPSILON_32) = 2**24 + (-23 - (-126) -1) * 2**2354    expect(floatToIndex(EPSILON_32)).toBe(872415232);55    // index(1 - EPSILON_32 / 2) = index(1) - 156    expect(floatToIndex(1 - EPSILON_32 / 2)).toEqual(1065353215);57    // 1 === 1. * 2**0 --> m = 1, e = 058    // index(1) = 2**24 + (0 - (-126) -1) * 2**2359    expect(floatToIndex(1)).toEqual(1065353216);60    // index(1 + EPSILON_32) = index(1) + 161    expect(floatToIndex(1 + EPSILON_32)).toEqual(1065353217);62    // index(2 - EPSILON_32) = index(2) - 1 = index(1 + (2 ** 23 - 1) * EPSILON_32)63    expect(floatToIndex(2 - EPSILON_32)).toEqual(1073741823);64    // 1 === 1. * 2**1 --> m = 1, e = 165    // index(2) = index(1) + 2**2366    expect(floatToIndex(2)).toEqual(1073741824);67    expect(floatToIndex(MAX_VALUE_32)).toBe(2139095039);68  });69  it('should properly compute negative indexes', () => {70    expect(floatToIndex(-0)).toEqual(-1);71    expect(floatToIndex(-MIN_VALUE_32)).toBe(-2);72    expect(floatToIndex(-MAX_VALUE_32)).toBe(-2139095040);73  });74  it('should properly compute indexes for infinity', () => {75    expect(floatToIndex(Number.NEGATIVE_INFINITY)).toBe(floatToIndex(-MAX_VALUE_32) - 1);76    expect(floatToIndex(Number.POSITIVE_INFINITY)).toBe(floatToIndex(MAX_VALUE_32) + 1);77  });78  it('should be able to infer index for negative float from the positive one', () => {79    fc.assert(80      fc.property(float32raw(), (f) => {81        // Arrange82        fc.pre(isNotNaN32bits(f));83        const posD = f > 0 || 1 / f > 0 ? f : -f;84        // Act85        const indexPos = floatToIndex(posD);86        const indexNeg = floatToIndex(-posD);87        // Assert88        expect(indexNeg).toEqual(-indexPos - 1);89      })90    );91  });92  it('should return index +1 for the successor of a given float', () => {93    fc.assert(94      fc.property(95        fc.integer({ min: -126, max: +127 }),96        fc.integer({ min: 0, max: 2 ** 24 - 1 }),97        (exponent, rescaledSignificand) => {98          // Arrange99          fc.pre(exponent === -126 || rescaledSignificand >= 2 ** 23); // valid100          fc.pre(exponent !== 127 || rescaledSignificand !== 2 ** 24 - 1); // not max101          const current = rescaledSignificand * EPSILON_32 * 2 ** exponent;102          const next = (rescaledSignificand + 1) * EPSILON_32 * 2 ** exponent;103          // Act / Assert104          expect(floatToIndex(next)).toEqual(floatToIndex(current) + 1);105        }106      )107    );108  });109  it('should preserve ordering between two floats', () => {110    fc.assert(111      fc.property(float32raw(), float32raw(), (fa32, fb32) => {112        // Arrange113        fc.pre(isNotNaN32bits(fa32) && isNotNaN32bits(fb32));114        // Act / Assert115        if (isStrictlySmaller(fa32, fb32)) expect(floatToIndex(fa32)).toBeLessThan(floatToIndex(fb32));116        else expect(floatToIndex(fa32)).toBeGreaterThanOrEqual(floatToIndex(fb32));117      })118    );119  });120});121describe('indexToFloat', () => {122  it('should properly find floats corresponding to well-known values', () => {123    expect(indexToFloat(-2139095041)).toBe(Number.NEGATIVE_INFINITY);124    expect(indexToFloat(-2139095040)).toBe(-MAX_VALUE_32);125    expect(indexToFloat(-1)).toBe(-0);126    expect(indexToFloat(0)).toBe(0);127    expect(indexToFloat(872415232)).toBe(EPSILON_32);128    expect(indexToFloat(2139095039)).toBe(MAX_VALUE_32);129    expect(indexToFloat(2139095040)).toBe(Number.POSITIVE_INFINITY);130  });131  it('should only produce 32-bit floating point numbers (excluding NaN)', () => {132    fc.assert(133      fc.property(fc.integer({ min: -2139095041, max: 2139095040 }), (index) => {134        // Arrange / Act135        const f = indexToFloat(index);136        // Assert137        expect(f).toBe(new Float32Array([f])[0]);138      })139    );140  });141  it('should reverse floatToIndex', () => {142    fc.assert(143      fc.property(float32raw(), (f32) => {144        // Arrange145        fc.pre(isNotNaN32bits(f32));146        // Act / Assert147        expect(indexToFloat(floatToIndex(f32))).toBe(f32);148      })149    );150  });151  it('should be reversed by floatToIndex', () => {152    fc.assert(153      fc.property(fc.integer({ min: -2139095041, max: 2139095040 }), (index) => {154        // The test below checks that indexToFloat(floatToIndex) is identity155        // It does not confirm that floatToIndex(indexToFloat)) is identity156        expect(floatToIndex(indexToFloat(index))).toBe(index);157      })158    );159  });...

DoubleHelpers.ts

Source: DoubleHelpers.ts

1import { ArrayInt64, clone64, isEqual64 } from './ArrayInt64';2const safeNegativeInfinity = Number.NEGATIVE_INFINITY;3const safePositiveInfinity = Number.POSITIVE_INFINITY;4const safeNaN = Number.NaN;5const safeEpsilon = Number.EPSILON;6/** @internal */7const INDEX_POSITIVE_INFINITY: ArrayInt64 = { sign: 1, data: [2146435072, 0] }; // doubleToIndex(Number.MAX_VALUE) + 1;8/** @internal */9const INDEX_NEGATIVE_INFINITY: ArrayInt64 = { sign: -1, data: [2146435072, 1] }; // doubleToIndex(-Number.MAX_VALUE) - 110/**11 * Decompose a 64-bit floating point number into a significand and exponent12 * such that:13 * - significand over 53 bits including sign (also referred as fraction)14 * - exponent over 11 bits including sign15 * - whenever there are multiple possibilities we take the one having the highest significand (in abs)16 * - Number.MAX_VALUE = 2**1023    * (1 + (2**52-1)/2**52)17 *                    = 2**1023    * (2 - Number.EPSILON)18 * - Number.MIN_VALUE = 2**(-1022) * 2**(-52)19 * - Number.EPSILON   = 2**(-52)20 *21 * @param d - 64-bit floating point number to be decomposed into (significand, exponent)22 *23 * @internal24 */25export function decomposeDouble(d: number): { exponent: number; significand: number } {26  // 1 => significand 0b1   - exponent 1 (will be preferred)27  //   => significand 0b0.1 - exponent 228  const maxSignificand = 2 - safeEpsilon;29  for (let exponent = -1022; exponent !== 1024; ++exponent) {30    const powExponent = 2 ** exponent;31    const maxForExponent = maxSignificand * powExponent;32    if (Math.abs(d) <= maxForExponent) {33      return { exponent, significand: d / powExponent };34    }35  }36  return { exponent: safeNaN, significand: safeNaN };37}38/** @internal */39function positiveNumberToInt64(n: number): ArrayInt64['data'] {40  return [~~(n / 0x100000000), n >>> 0];41}42/** @internal */43function indexInDoubleFromDecomp(exponent: number, significand: number): ArrayInt64['data'] {44  // WARNING: significand >= 045  // By construct of significand in decomposeDouble,46  // significand is always max-ed.47  // The double close to zero are the only one having a significand <1, they also have an exponent of -1022.48  // They are in range: [2**(-1022) * 2**(-52), 2**(-1022) * (2 - 2 ** 52)]49  // In other words there are 2**53 elements in that range if we include zero.50  // All other ranges (other exponents) have a length of 2**52 elements.51  if (exponent === -1022) {52    // We want the significand to be an integer value (like an index)53    const rescaledSignificand = significand * 2 ** 52; // significand * 2**5254    return positiveNumberToInt64(rescaledSignificand);55  }56  // Offset due to exp = -1022 + Offset of previous exp (excl. -1022) + Offset in current exp57  // 2**53 + (exponent - (-1022) -1) * 2**52 + (significand - 1) * 2**5258  // (exponent + 1023) * 2**52 + (significand - 1) * 2**5259  const rescaledSignificand = (significand - 1) * 2 ** 52; // (significand-1) * 2**5260  const exponentOnlyHigh = (exponent + 1023) * 2 ** 20; // (exponent + 1023) * 2**52 => [high: (exponent + 1023) * 2**20, low: 0]61  const index = positiveNumberToInt64(rescaledSignificand);62  index[0] += exponentOnlyHigh;63  return index;64}65/**66 * Compute the index of d relative to other available 64-bit floating point numbers67 * Rq: Produces negative indexes for negative doubles68 *69 * @param d - 64-bit floating point number, anything except NaN70 *71 * @internal72 */73export function doubleToIndex(d: number): ArrayInt64 {74  if (d === safePositiveInfinity) {75    return clone64(INDEX_POSITIVE_INFINITY);76  }77  if (d === safeNegativeInfinity) {78    return clone64(INDEX_NEGATIVE_INFINITY);79  }80  const decomp = decomposeDouble(d);81  const exponent = decomp.exponent;82  const significand = decomp.significand;83  if (d > 0 || (d === 0 && 1 / d === safePositiveInfinity)) {84    return { sign: 1, data: indexInDoubleFromDecomp(exponent, significand) };85  } else {86    const indexOpposite = indexInDoubleFromDecomp(exponent, -significand);87    if (indexOpposite[1] === 0xffffffff) {88      indexOpposite[0] += 1;89      indexOpposite[1] = 0;90    } else {91      indexOpposite[1] += 1;92    }93    return { sign: -1, data: indexOpposite }; // -indexInDoubleFromDecomp(exponent, -significand) - 194  }95}96/**97 * Compute the 64-bit floating point number corresponding to the provided indexes98 *99 * @param n - index of the double100 *101 * @internal102 */103export function indexToDouble(index: ArrayInt64): number {104  if (index.sign === -1) {105    const indexOpposite: ArrayInt64 = { sign: 1, data: [index.data[0], index.data[1]] };106    if (indexOpposite.data[1] === 0) {107      indexOpposite.data[0] -= 1;108      indexOpposite.data[1] = 0xffffffff;109    } else {110      indexOpposite.data[1] -= 1;111    }112    return -indexToDouble(indexOpposite); // -indexToDouble(-index - 1);113  }114  if (isEqual64(index, INDEX_POSITIVE_INFINITY)) {115    return safePositiveInfinity;116  }117  if (index.data[0] < 0x200000) {118    // if: index < 2 ** 53  <--> index[0] < 2 ** (53-32) = 0x20_0000119    // The first 2**53 elements correspond to values having120    // exponent = -1022 and significand = index * Number.EPSILON121    // double value = index * 2 ** -1022 * Number.EPSILON122    //              = index * 2 ** -1022 * 2 ** -52123    //              = index * 2 ** -1074124    return (index.data[0] * 0x100000000 + index.data[1]) * 2 ** -1074;125  }126  const postIndexHigh = index.data[0] - 0x200000; // postIndex = index - 2 ** 53127  // exponent = -1021 + Math.floor(postIndex / 2**52)128  //          = -1021 + Math.floor(postIndexHigh / 2**(52-32))129  //          = -1021 + Math.floor(postIndexHigh / 2**20)130  //          = -1021 + (postIndexHigh >> 20)131  const exponent = -1021 + (postIndexHigh >> 20);132  // significand = 1 + (postIndex % 2**52) / 2**52133  //             = 1 + ((postIndexHigh * 2**32 + postIndexLow) % 2**52) / 2**52134  //             = 1 + ((postIndexHigh % 2**20) * 2**32 + postIndexLow) / 2**52135  //             = 1 + ((postIndexHigh & 0xfffff) * 2**32 + postIndexLow) / 2**52136  //             = 1 + ((postIndexHigh & 0xfffff) * 2**32 + postIndexLow) * Number.EPSILON137  const significand = 1 + ((postIndexHigh & 0xfffff) * 2 ** 32 + index.data[1]) * safeEpsilon;138  return significand * 2 ** exponent;...

Using AI Code Generation

1const { rescaledSignificand } = require('fast-check-monorepo');2const fc = require('fast-check');3const MAX_SIGNIFICAND = 2 ** 53 - 1;4const MAX_EXPONENT = 1023;5const MIN_EXPONENT = -1022;6const MAX_DOUBLE = MAX_SIGNIFICAND * 2 ** MAX_EXPONENT;7const MIN_DOUBLE = 1 / (2 ** (-MIN_EXPONENT));8const MIN_NORMALIZED_DOUBLE = 2 ** MIN_EXPONENT;9const MAX_NORMALIZED_DOUBLE = 2 ** MAX_EXPONENT;10const MAX_NORMALIZED_SIGNIFICAND = 2 ** 52 - 1;11const MIN_NORMALIZED_SIGNIFICAND = 2 ** 52;12const MAX_NORMALIZED_EXPONENT = 1023;13const MIN_NORMALIZED_EXPONENT = 1;14const MIN_NORMALIZED_DOUBLE = 2 ** MIN_NORMALIZED_EXPONENT;15const MAX_NORMALIZED_DOUBLE = 2 ** MAX_NORMALIZED_EXPONENT;16const MAX_NORMALIZED_SIGNIFICAND = 2 ** 52 - 1;17const MIN_NORMALIZED_SIGNIFICAND = 2 ** 52;18const MAX_NORMALIZED_EXPONENT = 1023;19const MIN_NORMALIZED_EXPONENT = 1;20const MIN_SUBNORMALIZED_DOUBLE = 2 ** MIN_EXPONENT;21const MAX_SUBNORMALIZED_DOUBLE = 2 ** MIN_NORMALIZED_EXPONENT;22const MAX_SUBNORMALIZED_SIGNIFICAND = 2 ** 52 - 1;23const MIN_SUBNORMALIZED_SIGNIFICAND = 1;24const MAX_SUBNORMALIZED_EXPONENT = 0;25const MIN_SUBNORMALIZED_EXPONENT = -1022;26const MAX_SUBNORMALIZED_DOUBLE = 2 ** MAX_SUBNORMALIZED_EXPONENT;27const MIN_SUBNORMALIZED_DOUBLE = 1 / (2 ** (-MIN_SUBNORMALIZED_EXPONENT));28const MAX_SUBNORMALIZED_SIGNIFICAND = 2 ** 52 - 1;29const MIN_SUBNORMALIZED_SIGNIFICAND = 1;30const MAX_SUBNORMALIZED_EXPONENT = 0;31const MIN_SUBNORMALIZED_EXPONENT = -1022;32const MIN_SUBNORMALIZED_DOUBLE = 1 / (2 ** (-MIN_SUBNORMALIZED_EXPONENT));33const MAX_SUBNORMALIZED_DOUBLE = 2 ** MAX_SUBNORMALIZED_EXPONENT;

Using AI Code Generation

1const fc = require('fast-check');2const { rescaledSignificand } = require('fast-check-monorepo');3const { rescaledSignificand } = require('fast-check-monorepo');4const myArbitrary = fc.integer().map(rescaledSignificand);5fc.assert(6  fc.property(myArbitrary, (n) => {7    return n >= 0 && n < 1;8  })9);10const fc = require('fast-check');11const { rescaledSignificand } = require('fast-check-monorepo');12const myArbitrary = fc.integer().map(rescaledSignificand);13fc.assert(14  fc.property(myArbitrary, (n) => {15    return n >= 0 && n < 1;16  })17);18const fc = require('fast-check');19const { rescaledSignificand } = require('fast-check-monorepo');20const myArbitrary = fc.integer().map(rescaledSignificand);21fc.assert(22  fc.property(myArbitrary, (n) => {23    return n >= 0 && n < 1;24  })25);26const fc = require('fast-check');27const { rescaledSignificand } = require('fast-check-monorepo');28const myArbitrary = fc.integer().map(rescaledSignificand);29fc.assert(30  fc.property(myArbitrary, (n) => {31    return n >= 0 && n < 1;32  })33);34const fc = require('fast-check');35const { rescaledSignificand } = require('fast-check-monorepo');36const myArbitrary = fc.integer().map(rescaledSignificand);37fc.assert(38  fc.property(myArbitrary, (n) => {39    return n >= 0 && n < 1;40  })41);

Using AI Code Generation

1const fc = require('fast-check');2const {rescaledSignificand} = require('fast-check/lib/check/arbitrary/FloatArbitrary');3const max = Number.MAX_VALUE;4const min = Number.MIN_VALUE;5const minExp = Number.MIN_SAFE_INTEGER;6const maxExp = Number.MAX_SAFE_INTEGER;7const floatArb = fc.float({min, max, minExp, maxExp});8const floatArb2 = fc.float({min: -max, max: -min, minExp, maxExp});9fc.assert(fc.property(floatArb, (x) => {10    const y = rescaledSignificand(x);11    return x === y;12}));13fc.assert(fc.property(floatArb2, (x) => {14    const y = rescaledSignificand(x);15    return x === y;16}));17const fc = require('fast-check');18const {rescaledSignificand} = require('fast-check/lib/check/arbitrary/FloatArbitrary');19const max = Number.MAX_VALUE;20const min = Number.MIN_VALUE;21const minExp = Number.MIN_SAFE_INTEGER;22const maxExp = Number.MAX_SAFE_INTEGER;23const floatArb = fc.float({min, max, minExp, maxExp});24const floatArb2 = fc.float({min: -max, max: -min, minExp, maxExp});25fc.assert(fc.property(floatArb, (x) => {26    const y = rescaledSignificand(x);27    return x === y;28}));29fc.assert(fc.property(floatArb2, (x) => {30    const y = rescaledSignificand(x);31    return x === y;32}));33const fc = require('fast-check');34const {rescaledSignificand} = require('fast-check/lib/check/arbitrary/FloatArbitrary');35const max = Number.MAX_VALUE;36const min = Number.MIN_VALUE;37const minExp = Number.MIN_SAFE_INTEGER;38const maxExp = Number.MAX_SAFE_INTEGER;39const floatArb = fc.float({min, max, minExp, maxExp});40const floatArb2 = fc.float({min: -max, max: -min, minExp, maxExp});41fc.assert(fc.property(floatArb, (x

Using AI Code Generation

1const fc = require('fast-check');2const { rescaledSignificand } = require('@fast-check/arbitrary-helpers');3const { property } = require('ava-fast-check');4const { test } = require('ava');5property('rescaledSignificand', [fc.integer(1, 1000), fc.integer(1, 1000)], (t, min, max) => {6  const rescaled = rescaledSignificand(min, max);7  t.true(rescaled >= min);8  t.true(rescaled <= max);9});10test('rescaledSignificand', t => {11  t.plan(2);12  const rescaled = rescaledSignificand(1, 1000);13  t.true(rescaled >= 1);14  t.true(rescaled <= 1000);15});16You need to create a new project (or use an existing one

Using AI Code Generation

1import { rescaledSignificand } from 'fast-check';2console.log(rescaledSignificand(1, 1, 1, 1, 1));3console.log(rescaledSignificand(2, 2, 2, 2, 2));4console.log(rescaledSignificand(3, 3, 3, 3, 3));5console.log(rescaledSignificand(4, 4, 4, 4, 4));6console.log(rescaledSignificand(5, 5, 5, 5, 5));

Using AI Code Generation

1const fc = require('fast-check')2const sigDig = 4;3const numTests = 100;4function f() {5    return fc.integer(0, 9).chain(firstDigit =>6        fc.integer(0, 9).chain(secondDigit =>7            fc.integer(0, 9).chain(thirdDigit =>8                fc.integer(0, 9).chain(fourthDigit =>9                    fc.integer(0, 9).chain(fifthDigit =>10                        fc.integer(0, 9).map(sixthDigit =>11                            fc.rescaledSignificand(12    );13}14for (let i = 0; i < numTests; i++) {

Blogs

Check out the latest blogs from LambdaTest on this topic:

A Detailed Guide To Xamarin Testing

Xamarin is an open-source framework that offers cross-platform application development using the C# programming language. It helps to simplify your overall development and management of cross-platform software applications.

How To Automate Mouse Clicks With Selenium Python

Sometimes, in our test code, we need to handle actions that apparently could not be done automatically. For example, some mouse actions such as context click, double click, drag and drop, mouse movements, and some special key down and key up actions. These specific actions could be crucial depending on the project context.

How Testers Can Remain Valuable in Agile Teams

Traditional software testers must step up if they want to remain relevant in the Agile environment. Agile will most probably continue to be the leading form of the software development process in the coming years.

Do you possess the necessary characteristics to adopt an Agile testing mindset?

To understand the agile testing mindset, we first need to determine what makes a team “agile.” To me, an agile team continually focuses on becoming self-organized and cross-functional to be able to complete any challenge they may face during a project.

Testing in Production: A Detailed Guide

When most firms employed a waterfall development model, it was widely joked about in the industry that Google kept its products in beta forever. Google has been a pioneer in making the case for in-production testing. Traditionally, before a build could go live, a tester was responsible for testing all scenarios, both defined and extempore, in a testing environment. However, this concept is evolving on multiple fronts today. For example, the tester is no longer testing alone. Developers, designers, build engineers, other stakeholders, and end users, both inside and outside the product team, are testing the product and providing feedback.

Automation Testing Tutorials

Learn to execute automation testing from scratch with LambdaTest Learning Hub. Right from setting up the prerequisites to run your first automation test, to following best practices and diving deeper into advanced test scenarios. LambdaTest Learning Hubs compile a list of step-by-step guides to help you be proficient with different test automation frameworks i.e. Selenium, Cypress, TestNG etc.