Please enable JavaScript.

Coggle requires JavaScript to display documents.

Scope & Closure (Hoisting (hoisting function declaration inside blocks…

- - - - in strict mode eval will not declare new variable, it will declare variable only for evaluated expression
- - - - Hoisted to the function scope
    - - function foo() {...}
        
        function declaration. Function name is registered in outer scope and available there
        
        function declaration can not be anonymous. It's invalid JS grammar
      - (function foo() {...})()
        
        function expression. Function name available only inside body of the function "foo"
        
        function expression can be anonymous
      - Anonymous functions expression
        
        drawbacks
        
        No name displayed in stack trace
        
        omit a name which helps to create readable self explainable code
        
        If recursion is needed then have to use deprecated arguments.callee
        
        inline function expressions
        setTimeout(function timeoutHandler(){....}, 300);
  - - - let used in for loop declares new variable per iteration. E.g.
        for(let i=0;i<4;i++){
        let j = i;
        ...}
      - do not hoist in the scope