What is the difference between Function declaration and Function expression?

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Function declaration	Function expression
Declared as a separate statement within the main JavaScript code	Created inside an expression or some other construct
Can be called before the function is defined	Created when the execution point reaches it; can be used only after that
Offers better code readability and better code organization	Used when there is a need for a conditional declaration of a function
Example:function abc() { return 5;}	Example:var a = function abc() { return 5;}

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