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How to Do Everything with JavaScript
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In this code, the loop is designed to execute 1,000 times, running through the numbers from 1 to 1,000 The if statement inside the loop checks to see whether the number is evenly divisible by 23, using the modulus (%) operator If it is not evenly divisible by 23, the continue statement is executed the rest of the current loop is skipped and the next iteration of the loop starts Every 23 numbers (it s odd how it works out like that), we will run into a number that is evenly divisible by 23 The continue statement is not executed, and the rest of the loop has a chance to run In our example, we output the happy news that we finally found a number that matches, using the documentwrite() function
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Using Labels
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A label is a named line of code Since their only purpose is related to loops nested loops in particular labels are rarely used in real life, although it is important to know they exist In programming terminology, you have created a nested loop when you place one loop completely inside another for instance, if you have a for loop inside a while loop In this situation, the for loop is known as the inner loop, and the while loop is called the outer loop Loops can be nested many levels deep
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CHAPTER 2: Learn JavaScript Fundamentals
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Labels are fairly easy to create 1 Open your JavaScript program using a text editor, such as Notepad 2 Pick the line of code that you would like to name Labels must appear at the beginning of a valid statement 3 Type a label name, using only letters or numbers No spaces or other special characters are allowed in the name 4 End the label with a colon (:) For instance, in the following code, we have a set of nested loops, which are also labeled
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var x, y, z; outer: for (x = 1; x < 20; x++) { middle: for (y = 1; y <= x; y++) { inner: for (z = 1; z <= y; z++) { documentwrite ("x = " + x + "; y = " + y + "z = " + z + "<br>"); } } }
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In this code, we have three loops The innermost loop, acting on the variable z, is labeled inner The middle loop, which encloses the loop named inner, is called middle And the outermost loop is named outer and encloses both the middle and inner loops The only reason to label a loop is because the break and continue statements are designed to work with labels By adding the following code immediately after the documentwrite function call inside the innermost loop, you could cause all three loops to exit prematurely:
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break outer;
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This is convenient when you have a condition inside an inner loop (it doesn t have to be the innermost one, however) that would make you want to stop processing all the loops or even just stop processing the two innermost and continue with the outer loop For instance, the following code placed inside the innermost loop in the preceding code would cause the variables y and z to never get past the value of 1, while x is allowed to increment to 20:
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break middle;
Comment Your Code
We discussed comments briefly in 1 Comments are not really a type of statement, although they are often lumped in with the other JavaScript statements for the sake of convenience There are two ways to add comments inside a JavaScript program
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You can add a single line of comments by starting your comments with two slashes
// Everything after the slashes will be ignored by JavaScript
It is also possible to include comments on the same line with valid code
var Students = 3; // There will be three students in the class
Another way to comment code is with block comments Block comments start with a slash and an asterisk (/*)
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