javascript how to add to a list code example

Example 1: js array add element

array.push(element)

Example 2: javscript append item from array

let foo = ['oop','plop','copo'];
	foo.push("plop");

Example 3: javascript append array to end of array

const new_array = old_array.concat([value1[, value2[, ...[, valueN]]]])