Web Reference: Self-invocation (also known as auto-invocation) is when a function executes immediately upon its definition. This is a core pattern and serves as the foundation for many other patterns of JavaScript development. Function expressions can be made self-invoking. A self-invoking function expression is invoked (started) automatically, without being called. Parentheses around the function tell JavaScript to treat the function as an expression. The function is wrapped in parentheses to turn it into an expression. The self-invoking functions are JavaScript functions that execute immediately as they are defined. To define a self-invoking function, you can enclose an anonymous function within parentheses followed by another set of parentheses. These are also called self-executing anonymous functions.
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