convert array to integer in javascript code example

Example 1: how to convert string to int a array in javascript

var a = "1,2,3,4";

var b = a.split(',').map(function(item) {
    return parseInt(item, 10);
});

Example 2: convert array to number

let x = [1,2,3,4,5]
let num = +x.join("")

Example 3: integer to array javascript

Array.from(String(12345), Number);