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Object-Oriented JavaScript - Third Edition by Stoyan Stefanov, Ved Antani

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Conditions and loops

Conditions provide a simple but powerful way to control the flow of code execution. Loops allow you to perform repetitive operations with less code. Let's take a look at:

  • if conditions
  • switch statements
  • while, do...while, for, and for...in loops

Note

The examples in the following sections require you to switch to the multiline Firebug console. Or, if you use the WebKit console, press Shift + Enter instead of Enter to add a new line.

Code blocks

In the preceding examples, you saw the use of code blocks. Let's take a moment to clarify what a block of code is, because you will use blocks extensively when constructing conditions and loops.

A block of code consists of zero or more expressions enclosed in curly brackets, which is shown ...

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