Weird Tricks with Functions
Functions are so special in JavaScript that you can do all sorts of crazy things to them. Whole books have been written on “functional” JavaScript, but let’s take a look at one trick that we will use later.
Recursion
Change the hello like this:
| | function hello(name) { |
| | var ret = 'Hello, ' + name + '! ' + 'You look very pretty today :)'; |
| | if (!name.match(/again/)) { |
| ① | ret = ret + ' /// ' + hello(name + ' (again)'); |
| | } |
| | return ret; |
| | } |
- ①
-
Look closely here. Inside the body of the function hello, we’re calling the function hello!
This will log the hello messages twice.
A function that calls itself ...
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