Getting empty array on applying splice. How to fix it?

Question

Here I want to add word at the last 4 letter before the x length. So i converted the string to array. Applied split. But when i tried to splice. Getting empty string on adding the second argument to the splice. Looking for help.

let x = "abcdefgh";
console.log(x);
console.log(x.length);
let y = x.split('');
console.log(y);
let len = (y.length - 4);
console.log(len);
console.log(y.splice(len));
console.log(y.splice(len, 0, "test"));

Answer 1

Your problem is understanding what Array#splice() returns

Per Array#splice() MDN docs

Returns: An array containing the deleted elements. If only one element is removed, an array of one element is returned. If no elements are removed, an empty array is returned.

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So do the splice first then log the whole array to see results

let x = "abcdefgh";

let y = x.split('');

let len = (y.length - 4);
y.splice(len, 0, "test");

console.log(y);