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I don't know Javacript a lot. I am still a begineer. Asking this just out of self curiosity why do we use self executing function in Javascript ?

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Self-invoking expressions are automatically invoked (started) without being called. 

A self-invoking expression is invoked immediately after it has been created. This is basically used to avoid naming a conflict, as well as to achieve encapsulation. Outside of this function, the variables or declared objects are not available. To avoid problems of minimization (filename.min) always use self executed functions      

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