Browse all JavaScript lessons.

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Adding Shapes to Maps with Leaflet and GeoJSON

P

Intro to Webpack

Drawing Text on Canvas

P

Lodash: Refactoring Simple For Loops

P

Simple drag and drop with Observables

Using the map method with Observable

Introducing the Observable

Create an Array concatAll method

Chaining the Array map and filter methods

The Array filter method

The Array map method

The Array forEach method

Get Started with LeafletJS Mapping

Gradient Fills on the HTML5 Canvas

P

Drawing Styles on HTML5 Canvas

P

Drawing Paths - Curves and Arcs

P

Drawing Paths - Lines and Rectangles

Introduction to the HTML Canvas element

Object Enhancements in ES6

Editing breakpoints in Chrome devtools

Using the ES6 spread operator

Shorthand Properties in ES6

Introduction to Lodash

Cleaning your build folder with grunt-contrib-clean

P

Minifying your output with grunt-uglify

Concatenating Your Javascript with grunt-contrib-concat

P

Development Automation Tasks with Grunt

P

Basic Metaprogramming: Dynamic Method

P

ES6 (ES2015) - Generators

Use Template Literals in ES6

Array Comprehensions - NON-STANDARD

Destructuring Assignment in ES6

Default Values for Function Parameters in ES6

Arrow Function => in ES6

The let keyword in ES6

traceur compiler and Grunt

P

Intro to ES6 and traceur compiler

Advanced Function Scope

P

JavaScript Function Scope Basics

Multitask

External Config

P

Uglify

P

Template

P

Grunt Watch

P

Introduction to Grunt

js tutorial about Adding Shapes to Maps with Leaflet and GeoJSON

Adding Shapes to Maps with Leaflet and GeoJSON

2:56 js PRO

With a basic map in place we can add shapes, like US states. We will then see how to style the shapes to make a visually appealing map.

js tutorial about Intro to Webpack

Intro to Webpack

4:29 js

Webpack is a module bundler that bundles javascript and other assets for the browser. It works really well for applications and javascript libraries and is very simple frontend build tool.

js tutorial about Drawing Text on Canvas

Drawing Text on Canvas

6:45 js PRO

With the HTML canvas you can easily draw text as well as graphics. Let's take a look at basic text manipulation on the canvas.

js tutorial about Lodash: Refactoring Simple For Loops

Lodash: Refactoring Simple For Loops

3:44 js PRO

This lesson shows how to refactor your old loops into using a simpler and more powerful lodash-style. We will start by looking at how many people traditionally write JavaScript for loops and then talk about the alternate style and benefits that Lodash offers.

js tutorial about Simple drag and drop with Observables

Simple drag and drop with Observables

12:35 js

Armed with the map and concatAll functions, we can create fairly complex interactions in a simple way. We will use Observable to create a simple drag and drop example with basic DOM elements.

js tutorial about Using the map method with Observable

Using the map method with Observable

3:45 js

Like an array, Observable has a map method that allows us to transform a sequence into a new Observable.

js tutorial about Introducing the Observable

Introducing the Observable

11:59 js

In this lesson we will get introduced to the Observable type. An Observable is a collection that arrives over time. Observables can be used to model events, asynchronous requests, and animations. Observables can also be transformed, combined, and consumed using the Array methods we learned in the previous lessons. We can write powerful and expressive asynchronous programs using the few simple methods we've learned so far.

js tutorial about Create an Array concatAll method

Create an Array concatAll method

4:17 js

In addition to flat Arrays, programmers must often deal with nested Arrays. For example let's say we have an Array of stock exchanges, each of which is represented by an array of all the stocks listed on that exchange. If we were looking for a stock that matched a certain criteria, we would first need to loop through all of the exchanges, and then all of the stocks within.

In these situations, most developers would nest two loops. However in this lesson we will write a new Array function "concatAll" which will automatically flatten nested arrays buy one dimension. This will remove the need to ever use a nested loop to flatten a nested array.

js tutorial about Chaining the Array map and filter methods

Chaining the Array map and filter methods

3:05 js

Both map and filter do not modify the array. Instead they return a new array of the results. Because both map and filter return Arrays, we can chain these functions together to build complex array transformations with very little code. Finally we can consume the newly created array using forEach. In this lesson, we will learn how to build nontrivial programs without using any loops at all.

js tutorial about The Array filter method

The Array filter method

4:42 js

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 of stocks and select only those with the price larger than a certain value. In this lesson we will demonstrate how to use the Array's filter method to easily perform this operation with less code than a loop would require.

js tutorial about The Array map method

The Array map method

3:02 js

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 only the name for display on screen. In this lesson we will demonstrate how to use the Array's map method to easily perform this operation with less code than a loop would require.

js tutorial about The Array forEach method

The Array forEach method

4:03 js

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 shorten your code in the process.

js tutorial about Get Started with LeafletJS Mapping

Get Started with LeafletJS Mapping

3:13 js

Leaflet makes creating maps in the browser dead simple. With some HTML and 3 lines of JavaScript, we can quickly have a map displaying.

js tutorial about Gradient Fills on the HTML5 Canvas

Gradient Fills on the HTML5 Canvas

5:20 js PRO

When drawing on the HTML5 canvas element, your fills aren't limited to flat colors. You can use gradients to get smoothly blended color fills on your drawn elements.

js tutorial about Drawing Styles on HTML5 Canvas

Drawing Styles on HTML5 Canvas

5:31 js PRO

You aren't limited to boring black lines when drawing on the HTML5 canvas element. Using styles, you can program interesting colorful images with JavaScript.

js tutorial about Drawing Paths - Curves and Arcs

Drawing Paths - Curves and Arcs

5:16 js PRO

When drawing on your HTML canvas in JavaScript, you aren't restricted to straight lines. Using curves and arcs you are able to create smooth curved lines.

js tutorial about Drawing Paths - Lines and Rectangles

Drawing Paths - Lines and Rectangles

3:06 js

Now that we have an HTML5 canvas to draw on, let's take a look at drawing simple lines and rectangles with JavaScript

js tutorial about Introduction to the HTML Canvas element

Introduction to the HTML Canvas element

4:55 js

The HTML Canvas element allows us to access powerful drawing APIs from JavaScript. In this lesson, the first in a series, we will learn about <canvas>, and get ready to start drawing.

js tutorial about Object Enhancements in ES6

Object Enhancements in ES6

2:12 js

Building on the ES6 Shorthand Properties lesson, John shows the other new Object Enhancements in ES6 that will help you write less code and easily create complex Objects.

js tutorial about Editing breakpoints in Chrome devtools

Editing breakpoints in Chrome devtools

4:29 js

There is more to breakpoints than just setting them. Learn how to edit and disable breakpoints, and log to the console without modifying your code.

js tutorial about Using the ES6 spread operator

Using the ES6 spread operator

1:40 js

The spread operator allows you to "explode" an array into its individual elements.

js tutorial about Shorthand Properties in ES6

Shorthand Properties in ES6

1:01 js

Shorthand properties allow you to compose complex objects from other objects.

js tutorial about Introduction to Lodash

Introduction to Lodash

1:33 js

Lodash is a toolkit of Javascript functions that provides clean, performant methods for manipulating objects and collections. It is a "fork" of the Underscore library and provides additional functionality as well as some serious performance improvements. If you aren't using Lodash, you should be.

js tutorial about Cleaning your build folder with grunt-contrib-clean

Cleaning your build folder with grunt-contrib-clean

2:05 js PRO

Grunt will clean up your build with the grunt-contrib-clean to make sure that no artifacts from previous builds are hanging around.

js tutorial about Minifying your output with grunt-uglify

Minifying your output with grunt-uglify

2:23 js

For production we want to use minified javascript to reduce the payload that is sent from the server. This can easily be accomplished with grunt-uglify.

js tutorial about Concatenating Your Javascript with grunt-contrib-concat

Concatenating Your Javascript with grunt-contrib-concat

2:02 js PRO

You can use Grunt to combine all of your Javascript files into a single concatenated file.

js tutorial about Development Automation Tasks with Grunt

Development Automation Tasks with Grunt

4:24 js PRO

With Grunt you can automate core tasks for your AngularJS project. In this lesson we will take a look at converting Stylus files to CSS, and add a watch task to convert those files automatically whenever a change is detected.

js tutorial about Basic Metaprogramming: Dynamic Method

Basic Metaprogramming: Dynamic Method

4:27 js PRO

Metaprogramming is a powerful tool for dynamically applying behavior to JavaScript objects. It can be a confusing concept, "code that writes code", but is very useful when you understand a few simple concepts. This lesson will show you how to create dynamic methods on your Javascript objects.

js tutorial about ES6 (ES2015) - Generators

ES6 (ES2015) - Generators

5:28 js

Generators in ECMAscript 6 are first-class coroutines that produce encapsulated suspended execution contexts. Whew! Yield values and iterate over them until no more values exist in the generator. We'll talk more about practical use later ;)

js tutorial about Use Template Literals in ES6

Use Template Literals in ES6

4:12 js

ECMAscript 6 lets us use string templates to gain a lot more control over strings in JavaScript.

js tutorial about Array Comprehensions - NON-STANDARD

Array Comprehensions - NON-STANDARD

2:28 js

Array Comprehensions didn't make the ES6 cut. You probably shouldn't use them ;)

See comments.

js tutorial about Destructuring Assignment in ES6

Destructuring Assignment in ES6

4:33 js

ECMAscript 6 destructuring provides flexible options for variable assignment.

js tutorial about Default Values for Function Parameters in ES6

Default Values for Function Parameters in ES6

2:16 js

With ECMAscript 6 we get the luxury of default parameters for our functions.

js tutorial about Arrow Function => in ES6

Arrow Function => in ES6

2:57 js

ECMAscript 6 introduces the "arrow function" as a shortcut for creating anonymous functions with this scope bound.

js tutorial about The let keyword in ES6

The let keyword in ES6

2:58 js

Block scoping can be surprising, and sometimes confusing, in Javascript. With es6, we have access to the let keyword to remove this pain.

js tutorial about traceur compiler and Grunt

traceur compiler and Grunt

3:30 js PRO

Build and watch ECMAscript 6 using traceur compiler and Grunt.

js tutorial about Intro to ES6 and traceur compiler

Intro to ES6 and traceur compiler

2:42 js

es6 is the next generation of javascript. You can use it today with the traceur compiler library. Also be sure to check out es6fiddle to start playing with ECMAscript 6 right now.

js tutorial about Advanced Function Scope

Advanced Function Scope

7:06 js PRO

Function scope and closures in JavaScript can be tricky. This lesson builds on the Function Scope Basics video to dive deeper into JS function scope.

js tutorial about JavaScript Function Scope Basics

JavaScript Function Scope Basics

5:45 js

This or that? Javascript scoping can be confusing. This lesson covers the very basics of function scoping.

Multitask

1:49 js

Grunt Multitask allows you to write complex tasks that run multiple targets. In this lesson, John will show you how to use Multitask in your GruntJS builds.

External Config

3:51 js PRO

In this lesson John will show you how to create a simple external config file for your GruntJS build.

Uglify

1:41 js PRO

In this lesson John will show you how to start using Grunt Uglify to compress your javascript for production deployment.

Template

3:45 js PRO

GruntJS allows you to use underscore/erb style templates to reduce repetition and create variables. This is commonly used to point at build folders and files within your application's structure.

Grunt Watch

3:03 js PRO

In this lesson John will show you how to get started with grunt-contrib-watch. Watch is an essential component of any Grunt build, and you will find yourself using it in almost every project.

Introduction to Grunt

3:58 js

In this lesson you will install GruntJS and get up and running with your first task, initial configuration, and how to get Grunt methods auto-completing in WebStorm.

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