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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