usingMap.js

Example 1 :- find square of numbers

var numberArray = [1,2,3,4,5,6,7,8,9,10];

//for Version
var squareNumbers = [];
for (var counter=0; counter < numberArray.length; counter++){
   squareNumbers.push(numberArray[counter] * numberArray[counter])
}
console.log(squareNumbers);

//forEach Version
var squareNumbers1 = [];
numberArray.forEach(number => {
    squareNumbers1.push(number*number);
})
console.log(squareNumbers1);

//Map version
var squareNumbers2 = numberArray.map(number => number*number);

//es5 version
var squareNumbers2 = numberArray.map(function(number){
     return number*number;
});
console.log(squareNumbers2);

Example 2:- Map objects to String array having name
var persons = [
  {id : 1, name : "John", tags : "javascript"}, 
  {id : 2, name : "Alice", tags : "javascript"}, 
  {id : 3, name : "Roger", tags : "java"},
  {id : 4, name : "Adam", tags : "javascript"},
  {id : 5, name : "Alex", tags : "java"}
];

var nameArray = persons.map(personObj => personObj.name);

//es5 version
var nameArray = persons.map(function(personObj){
      return personObj.name;
});

console.log(nameArray);