Array select usage : [{name : "William", age : 24}, {name : "Bertrand", age : 47}].select('age'); => return : [{age : 24}, {age : 47}] parameter can be a string or an Array of prop to select

select.js

/* Array select
usage : [{name : "William", age : 24}, {name : "Bertrand", age : 47}].select('age');
 => return : [{age : 24}, {age : 47}]
 parameter can be a string or an Array of prop to select*/
 
Array.prototype.select = function(props){
  var newArray = [];
  this.forEach(function(e){
    var newObj = {};
    if(typeof(props) === "string")
      props = [props];
    props.forEach(function(prop){
      if(e[prop] !== undefined)
        newObj[prop] = e[prop];
    });
    newArray.push(newObj);
  });
  return newArray;
};