Does anyone know how can I check whether a variable is a number or a string in JavaScript?...
First of all, let me make it clear that what I'm looking isn't a union type but a straight up concatenation i.e "Hel" + "lo" = "Hello" but for string literal types  Essentially I have a function which takes two strin...
It seems that when I use a numeric type as a key name in an object, it always gets converted to a string. Is there anyway to actually get it to store as a numeric? The normal typecasting does not seem to work.  Example:  var userId = 1; console.log...
Is there a better way to get the type of a variable in JS than typeof? It works fine when you do:  > typeof 1 "number" > typeof "hello" "string"   But it's useless when you try:  > typeof [1,2] "object"...
I'm working on the Project Euler problems (currently question 13).  For this question I have to find the first 10 digits of the sum of 100 numbers all of a size similar to this:  91,942,213,363,574,161,572,522,430,563,301,811,072,406,154,908,25...
What are the general rules that dictate when, where, how and why angle brackets, i.e. "<...>", should be used in TypeScript?  While I think I understand many individual uses of these brackets, I have a hard time seeing general patterns...
I just stumbled upon the documentation for the new (proposed for ES6, but already implemented in Firefox, Chrome & Opera) datatype in JavaScript, Symbol:  https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Symbol htt...
Consider empty JavaScript array:  var a = []; alert(a == false); // shows true alert(!a); // shows false!   How to explain this? What are the rules?...
I don't know why I never asked myself that questioned the last years before, but suddenly I could not find any answer for myself or with google.  Javascript is known to have no types for variables. A really nice thing. But somehow it must determi...

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