babelToJS.js

//in babel                      //in javascript 
const arr1 = ['a','b','c'];     var arr1 = ['a', 'b', 'c'];
const arr2 = ['d','e','f'];     var arr2 = ['d', 'e', 'f'];
var arr3= [...arr1,...arr2];    var arr3 = [].concat(arr1, arr2);