Which is the better way to check undefined in Javascript?
27606
Detecting an undefined object property
109927
JavaScript null check
19957
Is returning early from a function more elegant than an if statement?
37438
How do I use the CoffeeScript existential operator to check some object properties for undefined?
37643
Function overloading in Javascript - Best practices
40674
What is the difference between null and undefined in JavaScript?
157279
How do you check if a variable is an array in JavaScript?
6288
How do I check if an object has a specific property in JavaScript?
137138
How to check if an array element exists?
28807
What is the difference between the different methods of putting JavaScript code in an ?
144673
Why does this JavaScript code print "undefined" on the console?
80984
How do I check if an HTML element is empty using jQuery?
142624
Code with undefined behavior in C#
73021
Javascript : is given function empty?
102641
ObjectiveC: if (obj) {...} AND if (obj != nil) {...}, which is better?
125415
Why is undefined == undefined but NaN != NaN?
45164
Do 'if' statements in JavaScript require curly braces?