Javascript Equivalent…

Javascript, PHP
      • PHP preg_replace 
        let phone="+17778889999";
let p=phone.replace(/^\+1/,'');
      • PHP isset 
        if (typeof variable !== 'undefined')
      • PHP array_pop 
        path_arr.splice(-1,1); //note does not work for array[1]
      • PHP implode 
        var fruits = ["Banana", "Orange", "Apple", "Mango"];
var basket = fruits.join(" and ");
      • PHP explode 
        var abc_string="a,b,c";  
let abc_array = abc_string.split(',');