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Code: Use String Constant Macros

Chapter 8 - Ajax Optimization

For example, if you have a number of alert( ) invocations in your program, like this:

alert("An error has occurred");

you could set a global variable, like this:

msg="An error has occurred";

to serve as a string constant and then replace the repeated strings in the various alert( ) calls as follows:

alert(msg);

You can even use this macro expansion idea for partial strings. For example, use the earlier string constant that we set and modify it:

alert(msg+": email address is required");
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Last modified: February 19, 2009.

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