30秒学会 JavaScript 片段 – takeRightWhile

Removes elements from the end of an array until the passed function returns true. Returns the removed elements.

Loop through the array, using a Array.prototype.reduceRight() and accumulating elements while the function returns falsy value.

代码片段

const takeRightWhile = (arr, func) =>
  arr.reduceRight((acc, el) => (func(el) ? acc : [el, ...acc]), []);

使用样例

takeRightWhile([1, 2, 3, 4], n => n < 3); // [3, 4]