JavaScript 20 Lessons to Successful Web Development by Nixon Robin

Author:Nixon, Robin
Language: eng
Format: epub
Publisher: McGraw-Hill Education
Published: 2015-01-26T16:00:00+00:00

Using Local Variables

The solution to a sprawling name space packed with numerous variable names is to allow functions to reuse a variable name without it affecting the value of any variable with the same name used outside of the function. And the way this is achieved is with the var keyword.

To tell JavaScript that a variable you are using within a function should have local scope only, you simply precede it with the var keyword where it is first assigned a value, like this:

var MyVar = 42

From then on, this variable will have its value only within the function call (and any subfunctions that might be created within it). When the function returns, the variable’s value is forgotten, and if there is a global variable of the same name, it will retain its value because local variables don’t affect it.

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