Tag Javascript

What are Variables?

The sole purpose of a variable is to store a value. The reason why it’s called a variable is the value can change at any time within the JavaScript application. Variables are used throughout programming with JavaScript, there’s just no escaping them.

Before you can use a variable, you must declare it. To declare a variable, you use the var (for variable) keyword, followed by the identifier (or variable name).

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Expressions are operations on numbers or text strings.

Numeric Expressions

On numbers, you typically perform arithmetic operations, such as addition, subtraction, multiplication, division, etc. To code an arithmetic expression, you use arithmetic operators to operate on two or more values.

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There are three types of data in JavaScript:

• Number
• String
• Boolean

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JavaScript Identifiers are names; names that you give things in JavaScript. These JavaScript “things” include

• variables
• functions
• objects
• properties
• methods
• events

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JavaScript statements are the core building block for anything JavaScript. A JavaScript statement is merely an instruction, telling your JavaScript what to do. Here are some examples of basic JavaScript statements:

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Before you write your Javascript, you have to know how best to incorporate it into your pages. Officially, there are three methods.

• In-line
• Embedded
• External

Inline “was” one of the more popular methods of including JavaScript on a page. However, in keeping the web standards approach in mind (seperation of content, design & functionality), we’ll focus on the last two.

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Things come easy, things come difficult.

For the past 17+ years, I’ve created websites. HTML, XHTML, HTML5, CSS, CSS3, you name it, I’ve done it. I’ve even used Flash, JavaScript and jQuery to enhance my sites. Again, I’ve used JavaScript & jQuery, but I haven’t known it up to this point.

I’ve spent over a decade trying to grasp it; each time, it would elude me and/or I’d become distracted by something more digestible. With the JavaScript renaissance (the advent of JavaScript libraries, AJAX, and all the other developer toys), JavaScript and related libraries have become a requirement in the front-end developer’s tool belt. And overnight, I was behind the ball instead of alongside or in front. So this year, I’ve made it a priority to not only learn, but know JavaScript. I don’t want nor need to be an expert (as I’m heading down a UX track). But I have to know it, create it, manipulate it.

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It’s a new year, and it’s time to get back to work.

So why do your websites still read © last year or worse?

Most web site owners forget to update their copyright date. And it’s easy to understand why. For most sites, the footer, where the copyright date usually sits, is below the fold and in small type anyways. But for site visitors, it can communicate the freshness of a website’s content. So it doesn’t hurt to make sure this information is updated.

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