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"...
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...
Consider empty JavaScript array:  var a = []; alert(a == false); // shows true alert(!a); // shows false!   How to explain this? What are the rules?...
How can I check if a variable's type is of type Boolean?  I mean, there are some alternatives such as:  if(jQuery.type(new Boolean()) === jQuery.type(variable))       //Do something..   But that doesn't seem pretty to me.  Is there a cleaner...
For example, I've made a JavaScript library called lowclass and I'm wondering how to make it work in the TypeScript type system.  The library lets us define a class by passing in an object-literal into the API, like the following, and I'm...
Suppose you are creating the data type and expose its behavior.   Can you give some examples of when would you use:   a function & new:  // define new data type var CustomDataType= function(){                        this.a='whatever';...
For the last week, I've been researching how it could be possible to type function return values to the funtion itself in TypeScript.  What is hard to me is types are not the first-class object in TypeScript(or any other type systems, not sure)....
View this code:  function testprecision(){     var isNotNumber = parseFloat('1.3').toPrecision(6);     alert(typeof isNotNumber); //=> string }   I would have expected a number. If 'isNotNumber' should be a real number, recasting i...
I'm trying to use some of the more advanced OO features of Javascript, following Doug Crawford's "super constructor" pattern. However, I don't know how to set and get types from my objects using Javascript's native type system...

Tags

Recent Questions

Top Questions

Home Tags Terms of Service Privacy Policy DMCA Contact Us

©2020 All rights reserved.