How to use safeGenerateForIndex method in fast-check-monorepo

Best JavaScript code snippet using fast-check-monorepo

FrequencyArbitrary.ts

Source:FrequencyArbitrary.ts

...60  }61  generate(mrng: Random, biasFactor: number | undefined): Value<T> {62    if (this.mustGenerateFirst()) {63      // index=0 can be selected even if it has a weight equal to zero64      return this.safeGenerateForIndex(mrng, 0, biasFactor);65    }66    const selected = mrng.nextInt(this.computeNegDepthBenefit(), this.totalWeight - 1);67    for (let idx = 0; idx !== this.cumulatedWeights.length; ++idx) {68      if (selected < this.cumulatedWeights[idx]) {69        return this.safeGenerateForIndex(mrng, idx, biasFactor);70      }71    }72    throw new Error(`Unable to generate from fc.frequency`);73  }74  canShrinkWithoutContext(value: unknown): value is T {75    return this.canShrinkWithoutContextIndex(value) !== -1;76  }77  shrink(value: T, context?: unknown): Stream<Value<T>> {78    if (context !== undefined) {79      const safeContext = context as _FrequencyArbitraryContext<T>;80      const selectedIndex = safeContext.selectedIndex;81      const originalBias = safeContext.originalBias;82      const originalArbitrary = this.warbs[selectedIndex].arbitrary;83      const originalShrinks = originalArbitrary84        .shrink(value, safeContext.originalContext)85        .map((v) => this.mapIntoValue(selectedIndex, v, null, originalBias));86      if (safeContext.clonedMrngForFallbackFirst !== null) {87        if (safeContext.cachedGeneratedForFirst === undefined) {88          safeContext.cachedGeneratedForFirst = this.safeGenerateForIndex(89            safeContext.clonedMrngForFallbackFirst,90            0,91            originalBias92          );93        }94        const valueFromFirst = safeContext.cachedGeneratedForFirst;95        return Stream.of(valueFromFirst).join(originalShrinks);96      }97      return originalShrinks;98    }99    const potentialSelectedIndex = this.canShrinkWithoutContextIndex(value);100    if (potentialSelectedIndex === -1) {101      return Stream.nil(); // No arbitrary found to accept this value102    }103    return this.defaultShrinkForFirst(potentialSelectedIndex).join(104      this.warbs[potentialSelectedIndex].arbitrary105        .shrink(value, undefined) // re-checked by canShrinkWithoutContextIndex106        .map((v) => this.mapIntoValue(potentialSelectedIndex, v, null, undefined))107    );108  }109  /** Generate shrink values for first arbitrary when no context and no value was provided */110  private defaultShrinkForFirst(selectedIndex: number): Stream<Value<T>> {111    ++this.context.depth; // increase depth112    try {113      if (!this.mustFallbackToFirstInShrink(selectedIndex) || this.warbs[0].fallbackValue === undefined) {114        // Not applicable: no fallback to first arbitrary on shrink OR no hint to shrink without an initial value and context115        return Stream.nil();116      }117    } finally {118      --this.context.depth; // decrease depth (reset depth)119    }120    // The arbitrary at [0] accepts to shrink fallbackValue.default without any context (context=undefined)121    const rawShrinkValue = new Value(this.warbs[0].fallbackValue.default, undefined);122    return Stream.of(this.mapIntoValue(0, rawShrinkValue, null, undefined));123  }124  /** Extract the index of the generator that would have been able to gennrate the value */125  private canShrinkWithoutContextIndex(value: unknown): number {126    if (this.mustGenerateFirst()) {127      return this.warbs[0].arbitrary.canShrinkWithoutContext(value) ? 0 : -1;128    }129    try {130      ++this.context.depth; // increase depth131      for (let idx = 0; idx !== this.warbs.length; ++idx) {132        const warb = this.warbs[idx];133        if (warb.weight !== 0 && warb.arbitrary.canShrinkWithoutContext(value)) {134          return idx;135        }136      }137      return -1;138    } finally {139      --this.context.depth; // decrease depth (reset depth)140    }141  }142  /** Map the output of one of the children with the context of frequency */143  private mapIntoValue(144    idx: number,145    value: Value<T>,146    clonedMrngForFallbackFirst: Random | null,147    biasFactor: number | undefined148  ): Value<T> {149    const context: _FrequencyArbitraryContext<T> = {150      selectedIndex: idx,151      originalBias: biasFactor,152      originalContext: value.context,153      clonedMrngForFallbackFirst,154    };155    return new Value(value.value, context);156  }157  /** Generate using Arbitrary at index idx and safely handle depth context */158  private safeGenerateForIndex(mrng: Random, idx: number, biasFactor: number | undefined): Value<T> {159    ++this.context.depth; // increase depth160    try {161      const value = this.warbs[idx].arbitrary.generate(mrng, biasFactor);162      const clonedMrngForFallbackFirst = this.mustFallbackToFirstInShrink(idx) ? mrng.clone() : null;163      return this.mapIntoValue(idx, value, clonedMrngForFallbackFirst, biasFactor);164    } finally {165      --this.context.depth; // decrease depth (reset depth)166    }167  }168  /** Check if generating a value based on the first arbitrary is compulsory */169  private mustGenerateFirst(): boolean {170    return this.constraints.maxDepth <= this.context.depth;171  }172  /** Check if fallback on first arbitrary during shrinking is required */...

Using AI Code Generation

1const fc = require('fast-check');2const { safeGenerateForIndex } = require('fast-check-monorepo');3  .integer()4  .filter((x) => x > 0)5  .map((x) => x + 1);6console.log(result1);7console.log(result2);8    at safeGenerateForIndex (C:\Users\testuser\Documents\test\test1\node_modules\fast-check-monorepo\lib\arbitrary\safeGenerate.js:15:29)9    at Object.<anonymous> (C:\Users\testuser\Documents\test\test1\test3.js:11:29)10    at Module._compile (internal/modules/cjs/loader.js:1137:30)11    at Object.Module._extensions..js (internal/modules/cjs/loader.js:1157:10)12    at Module.load (internal/modules/cjs/loader.js:985:32)13    at Function.Module._load (internal/modules/cjs/loader.js:878:14)14    at Function.executeUserEntryPoint [as runMain] (internal/modules/run_main.js:71:12)15describe('test', () => {16  it('a', () => {})17  it('b', () => {})18  it('c', () => {})19})20describe('test', () => {

Using AI Code Generation

1const { safeGenerateForIndex } = require('fast-check-monorepo')2const result = safeGenerateForIndex(0, 'string', 1000)3console.log(result)4const { safeGenerateForPath } = require('fast-check-monorepo')5const result = safeGenerateForPath('string', 1000)6console.log(result)7const { safeGenerateForPath } = require('fast-check-monorepo')8const result = safeGenerateForPath('string', 1000)9console.log(result)10const { safeGenerateForPath } = require('fast-check-monorepo')11const result = safeGenerateForPath('string', 1000)12console.log(result)13const { safeGenerateForPath } = require('fast-check-monorepo')14const result = safeGenerateForPath('string', 1000)15console.log(result)16const { safeGenerateForPath } = require('fast-check-monorepo')17const result = safeGenerateForPath('string', 1000)18console.log(result)19const { safeGenerateForPath } = require('fast-check-monorepo')20const result = safeGenerateForPath('string', 1000)21console.log(result)22const { safeGenerateForPath } = require('fast-check-monorepo')23const result = safeGenerateForPath('string', 1000)24console.log(result)25const { safeGenerateForPath } = require('fast-check-monorepo')26const result = safeGenerateForPath('string', 1000)27console.log(result)

Using AI Code Generation

1const fc = require('fast-check');2const { safeGenerateForIndex } = require('@dubzzz/fast-check');3const randomString = safeGenerateForIndex(fc.string(), 10);4console.log(randomString);5const fc = require('fast-check');6const { safeGenerateForIndex } = require('fast-check');7const randomString = safeGenerateForIndex(fc.string(), 10);8console.log(randomString);9const { safeGenerateForIndex } = require('fast-check');10const fc = require('fast-check');11const randomString = safeGenerateForIndex(fc.string(), 10);12console.log(randomString);13const fc = require('fast-check');14const { safeGenerateForIndex } = require('fast-check');15const randomString = safeGenerateForIndex(fc.string(), 10);16console.log(randomString);17const { safeGenerateForIndex } = require('fast-check');18const fc = require('fast-check');19const randomString = safeGenerateForIndex(fc.string(), 10);20console.log(randomString);21const { safeGenerateForIndex } = require('fast-check');22const fc = require('fast-check');23const randomString = safeGenerateForIndex(fc.string(), 10);24console.log(randomString);

Using AI Code Generation

1const { safeGenerateForIndex } = require('fast-check');2const fc = require('fast-check');3const arbData = fc.record({4  name: fc.string(),5  value: fc.integer(),6});7const arbIndex = fc.integer();8const arbInput = arbData.array().chain((data) => arbIndex.map((index) => ({ data, index })));9const prop = fc.property(arbInput, ({ data, index }) => {10  const res = safeGenerateForIndex(data, index);11  return res === data[index % data.length];12});13fc.assert(prop, { seed: 1234, numRuns: 10000 });

Using AI Code Generation

1const fc = require('fast-check')2const generator = fc.integer().safeGenerateForIndex(0)3console.log(generator)4const fc = require('fast-check')5const generator = fc.integer().safeGenerateForIndex(0)6console.log(generator)7const fc = require('fast-check')8const generator = fc.integer().safeGenerateForIndex(0)9console.log(generator)10const fc = require('fast-check')11const generator = fc.integer().safeGenerateForIndex(0)12console.log(generator)13const fc = require('fast-check')14const generator = fc.integer().safeGenerateForIndex(0)15console.log(generator)16const fc = require('fast-check')17const generator = fc.integer().safeGenerateForIndex(0)18console.log(generator)19const fc = require('fast-check')20const generator = fc.integer().safeGenerateForIndex(0)21console.log(generator)22const fc = require('fast-check')23const generator = fc.integer().safeGenerateForIndex(0)24console.log(generator)25const fc = require('fast-check')26const generator = fc.integer().safe

Using AI Code Generation

1const { safeGenerateForIndex } = require('fast-check-monorepo');2const arbs = require('fast-check-monorepo/lib/arbitrary/index.js');3const { seed } = require('fast-check-monorepo/lib/random/Random.js');4const { stringify } = require('fast-check-monorepo/lib/utils/JSON.js');5const arb = arbs.array(arbs.string(), 0, 100);6const index = 0;7const rnd = seed(42);8const value = safeGenerateForIndex(arb, index, rnd);9console.log(stringify(value));10const { safeGenerateForIndex } = require('fast-check');11const arbs = require('fast-check/lib/arbitrary/index.js');12const { seed } = require('fast-check/lib/random/Random.js');13const { stringify } = require('fast-check/lib/utils/JSON.js');14const arb = arbs.array(arbs.string(), 0, 100);15const index = 0;16const rnd = seed(42);17const value = safeGenerateForIndex(arb, index, rnd);18console.log(stringify(value));19const { safeGenerateForIndex } = require('./node_modules/fast-check/lib/fast-check-default.js');20const arbs = require('./node_modules/fast-check/lib/arbitrary/index.js');21const { seed } = require('./node_modules/fast-check/lib/random/Random.js');22const { stringify } = require('./node_modules/fast-check/lib/utils/JSON.js');23const arb = arbs.array(arbs.string(), 0, 100);24const index = 0;25const rnd = seed(42);26const value = safeGenerateForIndex(arb, index, rnd);27console.log(stringify(value));28const { safeGenerateForIndex } = require('./node_modules/fast-check-monorepo/lib/fast-check-default.js');29const arbs = require('./node_modules/fast-check-monorepo/lib/arbitrary/index.js');30const { seed } = require('./node_modules/fast-check-monorepo/lib/random/Random.js');31const { stringify } = require('./node_modules/fast

Using AI Code Generation

1const fc = require('fast-check');2const { safeGenerateForIndex } = require('fast-check/lib/arbitrary/index.js');3const { integer } = require('fast-check/lib/arbitrary/integer.js');4const { array } = require('fast-check/lib/arbitrary/array.js');5const uniqueArray = (size) => {6  return array(integer(), size, size).map((arr) => {7    const uniqueArr = [];8    for (let i = 0; i < arr.length; i++) {9      const value = safeGenerateForIndex(integer(), i, arr.length);10      if (!uniqueArr.includes(value)) {11        uniqueArr.push(value);12      }13    }14    return uniqueArr;15  });16};17fc.assert(18  fc.property(uniqueArray(5), (arr) => {19    return arr.length === new Set(arr).size;20  })21);22const fc = require('fast-check');23const { safeGenerateForIndex } = require('fast-check/lib/arbitrary/index.js');24const { integer } = require('fast-check/lib/arbitrary/integer.js');25const { array } = require('fast-check/lib/arbitrary/array.js');26const uniqueArray = (size) => {27  return array(integer(), size, size).map((arr) => {28    const uniqueArr = [];29    for (let i = 0; i < arr.length; i++) {30      const value = safeGenerateForIndex(integer(), i, arr.length);31      if (!uniqueArr.includes(value)) {32        uniqueArr.push(value);33      }34    }35    return uniqueArr;36  });37};38fc.assert(39  fc.property(uniqueArray(5), (arr) => {40    return arr.length === new Set(arr).size;41  })42);43const fc = require('fast-check');44const { safeGenerateForIndex } = require('fast-check/lib/arbitrary/index.js');45const { integer } = require('fast-check/lib/arbitrary/integer.js');46const { array }

Using AI Code Generation

1import { safeGenerateForIndex } from "./dist/index.js";2const [result, index] = safeGenerateForIndex(2, 1, 3, 1);3if (result === "ok") {4  console.log("result is ok");5} else {6  console.log("result is not ok");7}8console.log("index: " + index);9import { safeGenerateForIndex } from "./dist/index.js";10const [result, index] = safeGenerateForIndex(2, 1, 3, 2);11if (result === "ok") {12  console.log("result is ok");13} else {14  console.log("result is not ok");15}16console.log("index: " + index);17import { safeGenerateForIndex } from "./dist/index.js";18const [result, index] = safeGenerateForIndex(2, 1, 3, 3);19if (result === "ok") {20  console.log("result is ok");21} else {22  console.log("result is not ok");23}24console.log("index: " + index);25import { safeGenerateForIndex } from "./dist/index.js";26const [result, index] = safeGenerateForIndex(2, 1, 3, 4);27if (result === "ok") {28  console.log("result is ok");29} else {30  console.log("result is not ok");31}32console.log("index: " + index);33import { safeGenerateForIndex } from "./dist/index.js";34const [result, index] = safeGenerateForIndex(2, 1, 3, 5);35if (result === "ok") {36  console.log("result is ok");37} else {38  console.log("result is not ok");39}40console.log("index: " + index);41import { safeGenerateForIndex } from "./dist/index.js";

Using AI Code Generation

1const fc = require('fast-check');2const { safeGenerateForIndex } = require('fast-check-monorepo');3const testFunction = (arr) => {4}5const safeGenerate = safeGenerateForIndex(testFunction, 3);6describe('test3', () => {7  it('should pass', () => {8    fc.assert(fc.property(safeGenerate, testFunction));9  });10});11const fc = require('fast-check');12const { safeGenerateForIndex } = require('fast-check-monorepo');13const testFunction = (arr) => {14}15const safeGenerate = safeGenerateForIndex(testFunction, 3);16describe('test3', () => {17  it('should pass', () => {18    fc.assert(fc.property(safeGenerate, testFunction));19  });20});21const fc = require('fast-check');22const { safeGenerateForIndex } = require('fast-check-monorepo');23const testFunction = (arr) => {24}25const safeGenerate = safeGenerateForIndex(testFunction, 3);26describe('test3', () => {27  it('should pass', () => {28    fc.assert(fc.property(safeGenerate, testFunction));29  });30});

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