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I've been reading about the this keyword on MDN. In their article they have mentioned the following example: 

<button onclick="alert((function(){return this}()));">
  Show inner this
</button>
  • What is the purpose of brackets () after return statement {return this}()?
user31782
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    To actually call the anonymous function – Damiano Stoffie Apr 19 '16 at 06:50
  • Those brackets make the function a **self-invoking** anonymous function. – agdhruv Apr 19 '16 at 06:52
  • @ag_dhruv But it works even if we don't enclose the whole function and function call inside closed brackets, e.g. `( function(){return this}() )` works as well. The other post says enclosing function definition inside brackets converts the function definition into an expression. – user31782 Apr 19 '16 at 06:55

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