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There is also a lot of Java Script code available that is not built in.

Java Script from third parties is usually referred to as a "library" or "plugin". Let's go and grab it and load it into our page! Underscore gives you a ton of helpful functions to play with. You aren't limited to using other peoples functions — you can also write them yourself. Let's make a function called In my head I read it out loud like this: "there's a function called 'make more exciting' that takes in a string and returns a new copy of that string that has a bunch of exclamation points at the end".

First go to the Underscore site, click on the download link (I usually use development versions because they are easier to read but both will give you the same basic functionality), and then copy all the code onto your clipboard (you can use Select All from the Edit menu to select everything). Here is how we would write this in the console manually if we weren't using a function: The expression ).

Let's use our function instead of doing it manually.

First, paste the function into the console and then call the function by passing in a string: You could also call the same function by passing in a variable that points to a string (in the above example we just typed the string straight in there as a value instead of saving it to a variable first): The line on the other hand doesn't belong to anyone so it would be technically incorrect to refer to it as a method (confusing, I know).

The last line of the function is another built-in that simply takes in any values that you give it and prints them out into the console.

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But don't worry about this too much for now — you can just hit the up or down arrows on your keyboard while in the console to go through everything you've entered in recently.Now that we have our sentence stored in a variable, let's change a word stored in it!We can do this by performing a function is available to use on any strings and takes in two values: the characters to take out and the characters to swap in.Another thing you could do is type key and watch what happens.Using the console is a very important part of learning Java Script.

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