30秒学会 JavaScript 片段 – sample

Returns a random element from an array.

Use Math.random() to generate a random number, multiply it by length and round it off to the nearest whole number using Math.floor().
This method also works with strings.

代码片段

const sample = arr => arr[Math.floor(Math.random() * arr.length)];

使用样例

sample([3, 7, 9, 11]); // 9