# How to use indexInFloatFromDecomp method in fast-check-monorepo

Best JavaScript code snippet using fast-check-monorepo

math.ts

Source:math.ts

`...48 if (Number.isNaN(exponent) || Number.isNaN(significand) || !Number.isInteger(significand * 0x800000)) {49 return Number.NaN50 }51 if (f > 0 || (f === 0 && 1 / f === Number.POSITIVE_INFINITY)) {52 return indexInFloatFromDecomp(exponent, significand)53 } else {54 return -indexInFloatFromDecomp(exponent, -significand) - 155 }56}57/** @internal */58export function indexInFloatFromDecomp(exponent: number, significand: number) {59 // WARNING: significand >= 060 // By construct of significand in decomposeFloat,61 // significand is always max-ed.62 // The float close to zero are the only one having a significand <1, they also have an exponent of -126.63 // They are in range: [2**(-126) * 2**(-23), 2**(-126) * (2 - 2 ** 23)]64 // In other words there are 2**24 elements in that range if we include zero.65 // All other ranges (other exponents) have a length of 2**23 elements.66 if (exponent === -126) {67 return significand * 0x800000 // significand * 2**2368 }69 // Offset due to exp = -126 + Offset of previous exp (excl. -126) + Offset in current exp70 // 2**24 + (exponent - (-126) -1) * 2**23 + (significand - 1) * 2**2371 return (exponent + 127) * 0x800000 + (significand - 1) * 0x80000072}...`

FloatHelpers.ts

Source:FloatHelpers.ts

`...44 }45 return { exponent: safeNaN, significand: safeNaN };46}47/** @internal */48function indexInFloatFromDecomp(exponent: number, significand: number) {49 // WARNING: significand >= 050 // By construct of significand in decomposeFloat,51 // significand is always max-ed.52 // The float close to zero are the only one having a significand <1, they also have an exponent of -126.53 // They are in range: [2**(-126) * 2**(-23), 2**(-126) * (2 - 2 ** 23)]54 // In other words there are 2**24 elements in that range if we include zero.55 // All other ranges (other exponents) have a length of 2**23 elements.56 if (exponent === -126) {57 return significand * 0x800000; // significand * 2**2358 }59 // Offset due to exp = -126 + Offset of previous exp (excl. -126) + Offset in current exp60 // 2**24 + (exponent - (-126) -1) * 2**23 + (significand - 1) * 2**2361 return (exponent + 127) * 0x800000 + (significand - 1) * 0x800000;62}63/**64 * Compute the index of f relative to other available 32-bit floating point numbers65 * Rq: Produces negative indexes for negative floats66 *67 * @param f - 32-bit floating point number68 *69 * @internal70 */71export function floatToIndex(f: number): number {72 if (f === safePositiveInfinity) {73 return INDEX_POSITIVE_INFINITY;74 }75 if (f === safeNegativeInfinity) {76 return INDEX_NEGATIVE_INFINITY;77 }78 const decomp = decomposeFloat(f);79 const exponent = decomp.exponent;80 const significand = decomp.significand;81 if (safeNumberIsNaN(exponent) || safeNumberIsNaN(significand) || !safeNumberIsInteger(significand * 0x800000)) {82 return safeNaN;83 }84 if (f > 0 || (f === 0 && 1 / f === safePositiveInfinity)) {85 return indexInFloatFromDecomp(exponent, significand);86 } else {87 return -indexInFloatFromDecomp(exponent, -significand) - 1;88 }89}90/**91 * Compute the 32-bit floating point number corresponding to the provided indexes92 *93 * @param n - index of the float94 *95 * @internal96 */97export function indexToFloat(index: number): number {98 if (index < 0) {99 return -indexToFloat(-index - 1);100 }101 if (index === INDEX_POSITIVE_INFINITY) {...`

Using AI Code Generation

`1const { FloatArbitrary } = require('@dubzzz/fast-check');2const floatArbitrary = new FloatArbitrary();3const index = floatArbitrary.indexInFloatFromDecomp(0.0000001, 0.0000002, 0.0000003, 0.0000004, 0.0000005, 0.0000006, 0.0000007, 0.0000008, 0.0000009, 0.0000010);4console.log(index);5You can also use the following import:6I am using the following code to import the FloatArbitrary:7const { FloatArbitrary } = require('@dubzzz/fast-check/lib/check/arbitrary/definition/FloatArbitrary');8const floatArbitrary = new FloatArbitrary();9const index = floatArbitrary.indexInFloatFromDecomp(0.0000001, 0.0000002, 0.0000003,`

Using AI Code Generation

`1const { check, property } = require('fast-check')2const { indexInFloatFromDecomp } = require('fast-check-monorepo')3const isInteger = (x) => Number.isInteger(x) && x >= 0 && x < 14const isFloat = (x) => Number.isFinite(x) && x >= 0 && x < 15const isIndex = (x) => Number.isInteger(x) && x >= 06const isFloatIndex = (x) => Number.isFinite(x) && x >= 07const isIndexInFloat = (x) => Number.isInteger(x) && x >= 0 && x < 538const isIndexInFloatFromDecomp = (x) => Number.isInteger(x) && x >= 0 && x < 549check(10 property(11 [check.arrayOf(check.float, { maxLength: 54 }), check.nat],12 (decomp, index) => {13 const result = indexInFloatFromDecomp(decomp, index)14 return (15 isIndexInFloatFromDecomp(result) &&16 (index === 017 ? isInteger(decomp[0])18 : isFloat(decomp[index - 1]) || isInteger(decomp[index]))19 }20 { seed: 1, path: 'test3.js', endOnFailure: true }`

Using AI Code Generation

`1const { check, gen } = require('fast-check');2const { indexInFloatFromDecomp } = require('fast-check-monorepo');3check(4 gen.array(gen.float(), 3, 3),5 (decomp) => {6 const index = indexInFloatFromDecomp(decomp);7 return decomp[0] <= index && index < decomp[1];8 }9);`

Using AI Code Generation

`1const { check, property } = require('fast-check');2const { indexInFloatFromDecomp } = require('fast-check');3const checkIndexInFloatFromDecomp = property(4 (m, e) => {5 const res = indexInFloatFromDecomp(m, e);6 return res >= 0 && res < 2 ** 23;7 }8);9check(checkIndexInFloatFromDecomp, { verbose: true });`

Using AI Code Generation

`1const { IntegerArbitrary } = require('fast-check');2const { indexInFloatFromDecomp } = IntegerArbitrary;3const { toFloat32 } = require('ieee754');4const { decomp } = require('ieee754');5const decomp1 = decomp(1);6const decomp2 = decomp(2);7const decomp3 = decomp(3);8const decomp4 = decomp(4);9const decomp5 = decomp(5);10const decomp6 = decomp(6);11const decomp7 = decomp(7);12const decomp8 = decomp(8);13const decomp9 = decomp(9);14const decomp10 = decomp(10);15const decomp11 = decomp(11);16const decomp12 = decomp(12);17const decomp13 = decomp(13);18const decomp14 = decomp(14);19const decomp15 = decomp(15);20const decomp16 = decomp(16);21const decomp17 = decomp(17);22const decomp18 = decomp(18);23const decomp19 = decomp(19);24const decomp20 = decomp(20);25const decomp21 = decomp(21);26const decomp22 = decomp(22);27const decomp23 = decomp(23);28const decomp24 = decomp(24);29const decomp25 = decomp(25);30const decomp26 = decomp(26);31const decomp27 = decomp(27);32const decomp28 = decomp(28);33const decomp29 = decomp(29);34const decomp30 = decomp(30);35const decomp31 = decomp(31);36const decomp32 = decomp(32);37const decomp33 = decomp(33);38const decomp34 = decomp(34);39const decomp35 = decomp(35);40const decomp36 = decomp(36);41const decomp37 = decomp(37);42const decomp38 = decomp(38);43const decomp39 = decomp(39);44const decomp40 = decomp(40);45const decomp41 = decomp(41);46const decomp42 = decomp(42);47const decomp43 = decomp(43);48const decomp44 = decomp(`

Using AI Code Generation

`1const {Float} = require('fast-check-monorepo');2const decomp = [1.1, 2.2, 3.3, 4.4, 5.5, 6.6, 7.7, 8.8, 9.9, 10.1];3const float = 6.6;4const index = Float.indexInFloatFromDecomp(float, decomp);5console.log(index);6const floatAtIndex = decomp[index];7console.log(floatAtIndex);8const {Float} = require('fast-check-monorepo');9const decomp = [1.1, 2.2, 3.3, 4.4, 5.5, 6.6, 7.7, 8.8, 9.9, 10.1];10const float = 6.6;11const index = Float.indexInFloatFromDecomp(float, decomp);12console.log(index);13const floatAtIndex = decomp[index];14console.log(floatAtIndex);15console.log(floatAtIndex === decomp[index]);`

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