v1
6/22/2020 by Lamik 6/22/202000
Setup JavaScript
let arr = ['a', 'b', 'c', 'd'];
let idx = 1;ready
delete arr[idx];ready
arr.splice(idx,1);ready
var rest = arr.slice(idx + 1 || arr.length);
arr.length = idx < 0 ? arr.length + idx : idx;
arr.push.apply(arr, rest);ready
arr.slice(0,idx).concat(arr.slice(idx + 1));ready
arr.filter((a,i) => i !== idx);