js get the last element of the array All In One
Array.prototype.at()
// Array.at()
const arr = [1, 2, 3, 4, 5];
let index = 1;
console.log(arr.at(index));
// 2
let lastIndex = -1;
console.log(arr.at(lastIndex));
// 5
// 等价于
console.log(`\n`,arr[1]);
// 2
console.log(arr[arr.length - 1]);
// 5
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/at
refs
JavaScript & Array
groupBy
All In One
https://www.cnblogs.com/xgqfrms/p/15943811.html
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