JSFiddle - React, Tailwind, and code Playground

JavaScript

var array = ['A','B','C','D','E','A','B','C','D','E','A','B','C','D','E'];

function test(cb) {
    var newArray = [];
    for (var i = 0; i < array.length; i++) {
         newArray.push(array[i]);
    }
    cb(newArray);
}
         
test(function (data) {
    console.log(data);     
});

console.log('test');