One very common operation in programming is to iterate through an Array's contents, apply a function to each item, and create a new array containing the results. For example, let's say you wanted to loop through an array of stock objects and select o…
Most JavaScript developers are familiar with the for loop. One of the most common uses of the for loop is to iterate through the items in an array. In this lesson, we will learn how to replace the for loop with the Array's forEach method - and shorte…
One very common operation in programming is to iterate through an Array's contents, apply a test function to each item, and create a new array containing only those items the passed the test. For example, let's say you wanted to loop through an array…
Array.prototype.map() History Edit This article is in need of a technical review. Table of Contents Summary Syntax Parameters Description Compatibility Examples Example: Pluralizing the words (strings) in an array Example: Mapping an array of numbers…
Like an array, Observable has a map method that allows us to transform a sequence into a new Observable. var Observable = Rx.Observable; //Create click events by Observable var clicks = Observable.fromEvent(button, 'click'); var points = clicks.map(f…
