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Values are the simplest components in JavaScript. Notice how the string gets repeated in red when we type it into the console? This is because we haven't told it to save the sentence anywhere so it just gives it right back (or it gives us an Error back if we messed something up). OK, to fix up one of these sentences (by replacing dog with our enhanced version) we have to first save the original sentence so that we can call it up later when we do our replacing magic. The first two sentences had matching quotation marks at the beginning and end, but when I mixed single and double quotation marks it freaked out on me. Synta圎rror ILLEGAL is just the way it sounds when robots tell you that your program has a problem. See the nasty error message? Don't worry - you didn't break any laws. Single ' or double ' is fine, just make sure you use the same at the beginning as you do at the end. Strings have to begin AND end with a quotation mark. In JavaScript a bunch of letters, numbers, words or anything else is known as a String (as in a string of characters). First go into your console and type in a few sentences that contain the word dog at least once. Since I am a cat I want to replace every instance of the word dog on the Internet with those blasted dogs. If you don't know if something works or what the command is for something, go to the console and figure it out! Here's an example: # Strings Using the console is a very important part of learning JavaScript. Here I have started to type something and the console is helping me out by giving me a list of all the possible things I could continue to type! Another thing you could do is type 1 + 1 into the console and then hit the Enter key and watch what happens. They are super useful as a learning tool (I still use the console nearly every day that I'm coding). Basically it's a way to type one thing at a time into a computer and immediately get the computers answer back. This is a console, otherwise known as a 'command line' or 'terminal'. You should see a thingy that looks like this: For the sake of simplicity I'll assume you are using Google Chrome to read this page (if you aren't it's probably easier on both of us if you follow along with Chrome).įirst, right click anywhere on the screen and hit Inspect Element, then click on the Console tab. There is JavaScript running on this page right now. Don't worry though, this will happen very rarely. So don't be a scaredy-cat! The absolute worst thing that will happen is that you might have to refresh this page in your web browser if you get stuck. The best way to learn is by making mistakes! Programmers care more about making it work eventually rather than trying to make it work the very first time. Like cats, computer programmers make mistakes all time: misspelling things, forgetting quotes or brackets, and being forgetful of how basic functions (and yarn, lasers) work. You will always land on your feet - even when programming! Unlike pawing over a glass of water on your laptop, nothing in these tutorials will damage your computer in any way, even if you mistype a command or click the wrong button. Also since you are a cat you are less likely to run and more likely to lay around in the sun Table of contents Nowadays JavaScript runs in more places than just web browsers - it runs on web servers, phones and even robots! This page will teach you some JavaScript basics so that you can get up and running in no time*. JavaScript started as a way to make web pages more interactive. All web browsers understand JavaScript and you can take advantage of that to make web pages do crazy things! Just the same as one controls humans with hisses and meows, one controls computers with statements written in a programming language. JavaScript is a programming language or, in other words, a means by which a computer is instructed to do things. JavaScript For Cats An introduction for new programmers So easy your human companion could do it too!

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