Javascript Array map(projectionFunction)

Array.prototype.map = function (projectionFunction) {
  var results = [];
  this.forEach(function (itemInArray) {
    results.push(projectionFunction(itemInArray));

  });//from w w w . j  a  v a2 s.com

  return results;
};

'use strict';/* ww  w  . j  av  a2  s.com*/

Array.prototype.map = function(projectionFunction) {
  var results = [];
  this.forEach(item => results.push(projectionFunction(item)));
  return results;
};

Array.prototype.map = function(projectionFunction) {
  var reuslts = [];
  this.forEach(function(itemInArray){
    results.push(projectionFunction(itemInArray));
  })/*from w w  w  .  ja v a  2  s . com*/
  return results;
}

Array.prototype.map = function(projectionFunction) {
  var results = [];
  this.forEach(function(itemInArray) {
    results.push(projectionFunction(itemInArray));
  });// w w  w. j  a  v  a  2 s  . com
  return results;
};

console.log(JSON.stringify([1,2,3].map(function(x) { return x + 1; })) === '[2,3,4]');

Array.prototype.map = function (projectionFunction) {
    var results = [];
    this.forEach(function (itemArray) {
        results.push(itemArray + 1);/*from w w w.  j  a va2  s. c om*/
    });

    return results;
};

// JSON.stringify([1,2,3].map(function(x) { return x + 1; })) === '[2,3,4]'

Array.prototype.map = function(projectionFunction) {
  var results = [];
  this.forEach(itemInArray => results.push(projectionFunction(itemInArray)) );
  return results;
};