var characters = [

    { 'name': 'barney', 'age': 36 },

    { 'name': 'fred', 'age': 40 }

];

​

function pluck(array, prop) {

    var newArray = [];

    array.forEach(function(element) {

        newArray.push(element.prop);

        console.log(element.prop);

        console.log(element);

        console.log(prop);

    });

    console.log(newArray);

}

​

pluck(characters, 'name'); // ['barney', 'fred']