map()

The map() method creates a new array with the results of calling a provided function on every element in the calling array.

var new_array = arr.map(function callback(currentValue, index, array) {
    // Return element for new_array
}[, thisArg])

map() vs forEach() vs for loop

var tasks = [
  {
    name: 'Write for Envato Tuts+',
    duration: 120
  },
  {
    name: 'Work out',
    duration: 60
  },
  {
    name: 'Procrastinate on Duolingo',
    duration: 240
  }
];

let tmp = [];
for (let i = 0; i < tasks.length; i++) {
  tmp.push(tasks[i].name);
}

let tmp = [];
tasks.forEach((task) => tmp.push(task.name));

let tmp = tasks.map(task => task.name);