myForEach

script.js

var fruits= ['apple', 'orange', 'lemon', 'fig', 'banana'];
var numbers= [1, 2, 3, 4, 5];
var person = {firstName:"John", lastName:"Doe", age:46};

var mixed= [];
mixed[0]= person;
mixed[1]= new Date();
mixed[2]= fruits;

Array.prototype.myForEach = function(callback, thisObj) { 
    
    var len= this.length;
    
    for(var i=0; i< len; i++) {
        callback(i, this[i], this);
    }
};


function printIndex(index, element, array) {
  console.log( "[" + index + "] is " + element ); 
}
function addS(index, element, array) {
  console.log( element + "s" ); 
}

fruits.myForEach(printIndex);
fruits.myForEach(addS);

numbers.myForEach(printIndex);
numbers.myForEach(addS);

mixed.myForEach(printIndex);
mixed.myForEach(addS);