I have the following code:  var foo=5; var los= function (){     alert(foo);}; setInterval(los, 1000);   which works correctly.   If I change it to :  var los= function (){     alert(foo);}; setInterval(los(), 1000);   it only executes once with no e...
I have come across a self executing function that executes on a condition that the declared containing var exists, and if it doesn't exist it is passed an object.   Example:  var myFunc = (function(myFunc){}(myFunc || {}));   How come there is an...
I'm exercising in javascript calculations using a combination of maths and variables and i'm finding a difficulty on using the right way parentheses. For example i want to do the following calculation [(4,95/ans2)-4,5]*100 where ans2 is a cal...
I'm implementing a pretty-printer for a JavaScript AST and I wanted to ask if someone is aware of a "proper" algorithm to automatically parenthesize expressions with minimal parentheses based on operator precedence and associativity. I ha...
Why do nested parentheses cause empty strings in this regex?  var str = "ab((cd))ef"; var arr = str.split(/([\)\(])/); console.log(arr); // ["ab", "(", "", "(", "cd", ")", "", ")"...
Why does this return a syntax error:  function(foo){console.log(foo)}   I'd expect this to return the value of the function, hence return itself, and not assign it to anything, but i get a "SyntaxError: Unexpected token ("  but this works...
var obj, method;  obj = {   go: function() { console.log(this); } };  (method = obj.go)()     NOTE: Fyodor's first comment to his answer is what helped me the most. As the topic suggests, this was more about the parentheses than this.  In the l...
I am looking for JavaScript Regex that will replace the words in a block of text with only the first letter of each word BUT if there are words within brackets, leave them intact with the brackets. The purpose is to create a mnemonic device for remem...
I am trying to highlight parentheses depending on their level and if they are matched or not. So first level gets the following class paren_1, second gets paren_2 and so on. I want to highlight the set of parentheses next to the caret too, if there a...
Whenever I go through JavaScript code, I see a method that haves a pair of extra parentheses.  For example:   if( (typeOf VariableName) === "function" )    or   alert(("Hello World"))   What does these do, and why are they needed?...

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