December 2014
Intermediate to advanced
272 pages
8h 17m
English
Content preview from Learning AngularJS
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Understanding Variable Scope
After you start adding conditions, functions, and loops to your JavaScript applications, you need to understand variable scoping. Variable scoping sets out to determine the value of a specific variable name at the line of code currently being executed.
JavaScript enables you to define both a global version and a local version of a variable. The global version is defined in the main JavaScript, and local versions are defined inside functions. When you define a local version in a function, a new variable is created in memory. Within that function, you reference the local version. Outside that function, you reference the global version.
To understand variable scoping a bit better, consider the code in Listing 1.4.
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