pragmatic way of using call

callScenario.js

var domNodeArrays = Array.prototype.slice.call(domNodes);
// now domNodeArrays has the unshift methods
domNodeArrays.unshift("h1");


let test = [1,2,3,4]
// we make a shallow copy of the orignal array, now we are isolated
let shallowCopy = [].slice.call(test)
test[1] = 4
console.log(shallowCopy[1])
console.log(test[1])