30秒学会 JavaScript 片段 – Check if array elements are equal

Checks if all elements in an array are equal.

• Use Array.prototype.every() to check if all the elements of the array are the same as the first one.
• Elements in the array are compared using the strict comparison operator, which does not account for NaN self-inequality.

代码实现

const allEqual = arr => arr.every(val => val === arr[0]);

allEqual([1, 2, 3, 4, 5, 6]); // false
allEqual([1, 1, 1, 1]); // true

翻译自：https://www.30secondsofcode.org/js/s/array-element-equality