Category: javascript tutorials

In JavaScript, arrays store a list of items. An item may be a primitive such as a string or number. An item may also be an object or another array. Indexing starts at 0. Arrays are objects. To determine if a variable is an array, use Object.prototype.toString.call(theArray) === ‘[object Array]’ or the newer way of…

In JavaScript, variable names must start with a letter or underscore, are case sensitive and multiple words should be camel cased, example: aVariableName. Variable names may only contain letters, numbers and underscores. JavaScript determines what type a variable is. There are primitive and complex types. Valid primitive types include string, number, boolean, null, symbol and…

A best practice in programming is to adhere to a consistent style guide. It allows for more readable code and easier maintenance. All code looks uniform even when multiple people contribute to it. JavaScript doesn’t have one set standard style guide. There are a couple of different style guide options though. These are provided by…

Comments are used to make notes in source code about what a piece of code does or to not include executable lines of code when the application is run. Comments are not rendered on the page when the containing JavaScript file is loaded. Comments are created in JavaScript by adding 2 forward slashes, //, in…

JavaScript source files end in .js. JavaScript source files can be written in a simple text editor. IDE’s will offer a better experience though as they have features such as code completion, a debugger, error highlighting and source code formatting. I use NetBeans or Visual Studio Code. Other options include Eclipse, Atom, Komodo and Brackets.…

JavaScript runs in a web browser, so all that is needed to get started is having a web browser, such as Google Chrome, Firefox or Internet Explorer, etc. installed on your computer. That’s it. Super simple. Implementation: The goal of this JavaScript Tutorial series is to teach JavaScript to someone with programming knowledge. This tutorial…