add array integers to number javascript code example

Example 1: sum all elements in array javascript

arr.reduce((a, b) => a + b)

Example 2: javascript array push

var SomeRandomArray = [];
SomeRandomArray.push("Hello, world!");

Example 3: js array push

const arr = ["foo", "bar"];
arr.push('baz'); // 3
arr; // ["foo", "bar", "baz"]