randomInt

Generate a random integer in a range.

Demo

<script setup lang="ts">
import { randomInt } from '.'

const data = ref(-1)
</script>

<template>
  <div>
    <button btn @click="data = randomInt(0, 100)">
      Roll!
    </button>
    <p>{{ data }}</p>
  </div>
</template>

---

-1

Type Declarations

Details

/**
 * Closed interval random integer number
 *
 * @example
 *
 * ```js
 *  // 1 <= value <= 10
 * randomInt(1, 10)
 *  // A rand function return [0, 1) to replace `Math.random`
 * randomInt(1, 10, () => myRand())
 * ```
 *
 * ## Prove
 *
 * 1. rand() return value -> [0, 1)
 *
 * 2. rand() * (high - low + 1) return value -> [0, high - low + 1)
 *
 * 3. Floor it return value -> [0, high - low].
 *
 * When floor it, value is 0 -> [0, 1), 1 -> [0, 2), ... , Max -> [Max-1, Max),
 * and because Math.random return a uniform distribution number,
 * so the rate is still uniform distribution.
 *
 * 4. plus low -> [low, high]
 *
 * @see {@link https://s3xysteak.github.io/fnclip/functions/number/randomInt/}
 */
export declare function randomInt(min: number, max: number, rand?: () => number): number;

Source

Source • Demo