JS 生成随机布尔值 [英] JS generate random boolean

问题描述

简单的问题，但我对这里的细微差别很感兴趣.

Simple question, but I'm interested in the nuances here.

我正在使用我自己提出的以下方法生成随机布尔值:

I'm generating random booleans using the following method I came up with myself:

const rand = Boolean(Math.round(Math.random()));

每当 random() 出现时，似乎总会有一个陷阱 - 它不是真正随机的，它受到某种东西或其他东西的影响等等.所以，我想知道:

Whenever random() shows up, it seems there's always a pitfall - it's not truly random, it's compromised by something or other, etc. So, I'd like to know:

a) 以上是最佳实践方法吗?

a) Is the above the best-practice way to do it?

b) 我是不是想太多了?

b) Am I overthinking things?

c) 我是不是在想事情?

c) Am I underthinking things?

d) 有没有更好/更快/更优雅的方式我不知道?

d) Is there a better/faster/elegant-er way I don't know of?

(如果 B 和 C 互斥，也有点兴趣.)

(Also somewhat interested if B and C are mutually exclusive.)

更新

如果有什么不同，我会用它来移动 AI 角色.

If it makes a difference, I'm using this for movement of an AI character.

推荐答案

可以直接比较Math.random()和0.5，作为的范围Math.random() 是 [0, 1) (这意味着在 0 到 1 的范围内，包括 0，但不包括 1").您可以将范围分为 [0, 0.5) 和 [0.5, 1).

You can compare Math.random() to 0.5 directly, as the range of Math.random() is [0, 1) (this means 'in the range 0 to 1 including 0, but not 1'). You can divide the range into [0, 0.5) and [0.5, 1).

var random_boolean = Math.random() < 0.5;

// Example
console.log(Math.random() < 0.1); //10% probability of getting true
console.log(Math.random() < 0.4); //40% probability of getting true
console.log(Math.random() < 0.5); //50% probability of getting true
console.log(Math.random() < 0.8); //80% probability of getting true
console.log(Math.random() < 0.9); //90% probability of getting true

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