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

Best JavaScript code snippet using fast-check-monorepo

math.ts

Source:math.ts

`...8export const MAX_VALUE_32 = 2 ** 127 * (1 + (2 ** 23 - 1) / 2 ** 23)9/** @internal */10export const EPSILON_32 = 2 ** -2311/** @internal */12const INDEX_POSITIVE_INFINITY_32 = 2139095040 // floatToIndex(MAX_VALUE_32) + 1;13/** @internal */14const INDEX_NEGATIVE_INFINITY_32 = -2139095041 // floatToIndex(-MAX_VALUE_32) - 115export function safeFloatToIndex(f: number, label: string): I.IO<unknown, never, number> {16 const conversionTrick = 'you can convert any double to a 32-bit float by using `new Float32Array([myDouble])[0]`'17 const errorMessage = 'fc.floatNext constraints.' + label + ' must be a 32-bit float - ' + conversionTrick18 if (Number.isNaN(f) || (Number.isFinite(f) && (f < -MAX_VALUE_32 || f > MAX_VALUE_32))) {19 return I.die(new Error(errorMessage))20 }21 const index = floatToIndex(f)22 if (!Number.isInteger(index)) {23 return I.die(new Error(errorMessage))24 }25 return I.succeed(index)26}27export function decomposeFloat(f: number): { exponent: number, significand: number } {28 // 1 => significand 0b1 - exponent 1 (will be preferred)29 // => significand 0b0.1 - exponent 230 const maxSignificand = 1 + (2 ** 23 - 1) / 2 ** 2331 for (let exponent = -126; exponent !== 128; ++exponent) {32 const powExponent = 2 ** exponent33 const maxForExponent = maxSignificand * powExponent34 if (Math.abs(f) <= maxForExponent) {35 return { exponent, significand: f / powExponent }36 }37 }38 return { exponent: Number.NaN, significand: Number.NaN }39}40export function floatToIndex(f: number): number {41 if (f === Number.POSITIVE_INFINITY) {42 return INDEX_POSITIVE_INFINITY_3243 }44 if (f === Number.NEGATIVE_INFINITY) {45 return INDEX_NEGATIVE_INFINITY_3246 }47 const { exponent, significand } = decomposeFloat(f)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) - 1...`

FloatHelpers.spec.ts

Source:FloatHelpers.spec.ts

`...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 });...`

float.ts

Source:float.ts

`...51 // Number.NaN does not have any associated index in the current implementation52 // Finite values outside of the 32-bit range for floats cannot be 32-bit floats53 throw new Error(errorMessage);54 }55 const index = floatToIndex(f);56 if (!safeNumberIsInteger(index)) {57 // Index not being an integer means that original value was not a valid 32-bit float58 throw new Error(errorMessage);59 }60 return index;61}62/** @internal */63function unmapperFloatToIndex(value: unknown): number {64 if (typeof value !== 'number') throw new Error('Unsupported type');65 return floatToIndex(value);66}67/**68 * For 32-bit floating point numbers:69 * - sign: 1 bit70 * - significand: 23 bits71 * - exponent: 8 bits72 *73 * The smallest non-zero value (in absolute value) that can be represented by such float is: 2 ** -126 * 2 ** -23.74 * And the largest one is: 2 ** 127 * (1 + (2 ** 23 - 1) / 2 ** 23).75 *76 * @param constraints - Constraints to apply when building instances (since 2.8.0)77 *78 * @remarks Since 0.0.679 * @public80 */81export function float(constraints: FloatConstraints = {}): Arbitrary<number> {82 const {83 noDefaultInfinity = false,84 noNaN = false,85 min = noDefaultInfinity ? -MAX_VALUE_32 : safeNegativeInfinity,86 max = noDefaultInfinity ? MAX_VALUE_32 : safePositiveInfinity,87 } = constraints;88 const minIndex = safeFloatToIndex(min, 'min');89 const maxIndex = safeFloatToIndex(max, 'max');90 if (minIndex > maxIndex) {91 // Comparing min and max might be problematic in case min=+0 and max=-092 // For that reason, we prefer to compare computed index to be safer93 throw new Error('fc.float constraints.min must be smaller or equal to constraints.max');94 }95 if (noNaN) {96 return integer({ min: minIndex, max: maxIndex }).map(indexToFloat, unmapperFloatToIndex);97 }98 // In case maxIndex > 0 or in other words max > 0,99 // values will be [min, ..., +0, ..., max, NaN]100 // or [min, ..., max, NaN] if min > +0101 // Otherwise,102 // values will be [NaN, min, ..., max] with max <= +0103 const minIndexWithNaN = maxIndex > 0 ? minIndex : minIndex - 1;104 const maxIndexWithNaN = maxIndex > 0 ? maxIndex + 1 : maxIndex;105 return integer({ min: minIndexWithNaN, max: maxIndexWithNaN }).map(106 (index) => {107 if (index > maxIndex || index < minIndex) return safeNaN;108 else return indexToFloat(index);109 },110 (value) => {111 if (typeof value !== 'number') throw new Error('Unsupported type');112 if (safeNumberIsNaN(value)) return maxIndex !== maxIndexWithNaN ? maxIndexWithNaN : minIndexWithNaN;113 return floatToIndex(value);114 }115 );...`

Using AI Code Generation

`1const { floatToIndex } = require('fast-check');2const floatToIndex = require('fast-check').floatToIndex;3const { floatToIndex } = require('fast-check');4const floatToIndex = require('fast-check').floatToIndex;5I have a problem with my code. I have a function that takes a string as an argument and returns a string with the first letter of each word capitalized. I want to use the .map() method to return a new array, but I'm not sure how to do it. Here's my code:6function titleCase(str) {7 let newStr = str.split(' ');8 return newStr.map(function(newStr) {9 return newStr[0].toUpperCase() + newStr.slice(1);10 }).join(' ');11}12titleCase("I'm a little tea pot");13 {`

Using AI Code Generation

`1const fc = require('fast-check');2const { floatToIndex } = require('fast-check/lib/utils/FloatArray');3const fc = require('fast-check');4const { floatToIndex } = require('fast-check/lib/utils/FloatArray');5const fc = require('fast-check');6const { floatToIndex } = require('fast-check/lib/utils/FloatArray');7const fc = require('fast-check');8const { floatToIndex } = require('fast-check/lib/utils/FloatArray');9const fc = require('fast-check');10const { floatToIndex } = require('fast-check/lib/utils/FloatArray');11const fc = require('fast-check');12const { floatToIndex } = require('fast-check/lib/utils/FloatArray');13const fc = require('fast-check');14const { floatToIndex } = require('fast-check/lib/utils/FloatArray');15const fc = require('fast-check');16const { floatToIndex } = require('fast-check/lib/utils/FloatArray');17const fc = require('fast-check');18const { floatToIndex } = require('fast-check/lib/utils/FloatArray');19const fc = require('fast-check');20const { floatToIndex } = require('fast-check/lib/utils/FloatArray');21const fc = require('fast-check');22const { floatToIndex } = require('fast-check/lib/utils/FloatArray');23const fc = require('fast-check');24const { floatToIndex } = require('fast-check/lib/utils/FloatArray');25const fc = require('fast-check');26const { floatToIndex } = require('fast`

Using AI Code Generation

`1const { floatToIndex } = require('fast-check');2const index = floatToIndex(1.1, 0, 2, 10);3const { floatToIndex } = require('fast-check');4const index = floatToIndex(1.1, 0, 2, 10);5 throw err;6 at Function.Module._resolveFilename (internal/modules/cjs/loader.js:880:15)7 at Function.Module._load (internal/modules/cjs/loader.js:725:27)8 at Module.require (internal/modules/cjs/loader.js:952:19)9 at require (internal/modules/cjs/helpers.js:88:18)10 at Object.<anonymous> (/Users/.../test3.js:1:15)11 at Module._compile (internal/modules/cjs/loader.js:1063:30)12 at Object.Module._extensions..js (internal/modules/cjs/loader.js:1092:10)13 at Module.load (internal/modules/cjs/loader.js:928:32)14 at Function.Module._load (internal/modules/cjs/loader.js:769:14)15 at Function.executeUserEntryPoint [as runMain] (internal/modules/run_main.js:72:12) {16}`

Using AI Code Generation

`1import {floatToIndex} from 'fast-check'2const index = floatToIndex(0.5, 1, 1000)3console.log(index)4import {indexToFloat} from 'fast-check'5const float = indexToFloat(500, 1, 1000)6console.log(float)7import {floatToIndex, indexToFloat} from 'fast-check'8const index = floatToIndex(0.5, 1, 1000)9const float = indexToFloat(index, 1, 1000)10console.log(float)11import {floatToIndex, indexToFloat} from 'fast-check'12const float = indexToFloat(floatToIndex(0.5, 1, 1000), 1, 1000)13console.log(float)14import {floatToIndex, indexToFloat} from 'fast-check'15const float = indexToFloat(floatToIndex(0.5, 1, 1000), 1, 1000)16console.log(float)17import {floatToIndex, indexToFloat} from '`

Using AI Code Generation

`1const fc = require('fast-check');2const floatToIndex = require('fast-check-monorepo').floatToIndex;3const random = fc.random();4const index = floatToIndex(random.nextFloat(), 100);5console.log(random.nextFloat() + " " + index);6console.log(index + " " + random.nextFloat());7console.log(random.nextFloat() + " " + index);8const fc = require('fast-check');9const floatToIndex = require('fast-check-monorepo').floatToIndex;10const random = fc.random();11const index = floatToIndex(random.nextFloat(), 100);12console.log(random.nextFloat() + " " + index);13console.log(index + " " + random.nextFloat());14console.log(random.nextFloat() + " " + index);15const fc = require('fast-check');`

Using AI Code Generation

`1const fc = require("fast-check");2const { floatToIndex } = require("fast-check-monorepo");3const array = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10];4const float = fc.float({min: 0, max: 9});5fc.assert(6 fc.property(float, (float) => {7 const index = floatToIndex(float);8 return array[index] === float;9 })10);11const fc = require("fast-check");12const { floatToIndex } = require("fast-check-monorepo");13const array = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10];14const float = fc.float({min: 0, max: 9});15fc.assert(16 fc.property(float, (float) => {17 const index = floatToIndex(float);18 return array[index] === float;19 })20);21const fc = require("fast-check");22const { floatToIndex } = require("fast-check-monorepo");23const array = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10];24const float = fc.float({min: 0, max: 9});25fc.assert(26 fc.property(float, (float) => {27 const index = floatToIndex(float);28 return array[index] === float;29 })30);`

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