function declaration vs function call conflict#1546
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function(){return count++} is running because it is a function declaration. It is running and result of this running a function has been created and sent as a parameter to return command. "return count++;" this part is not running because the function has not been called yet.
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function(){return count++}is running because it is a function expression. It is running and result of this running, a function has been created and sent as a parameter to return command.return count++;this part is not running because the function has not been called yet.