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- Which equals operator (== vs ===) should be used in JavaScript . . .
JavaScript has two sets of equality operators: === and !==, and their evil twins == and != The good ones work the way you would expect The good ones work the way you would expect If the two operands are of the same type and have the same value, then === produces true and !== produces false
- How do you use the ? : (conditional) operator in JavaScript?
It's a little hard to google when all you have are symbols ;) The terms to use are "JavaScript conditional operator" If you see any more funny symbols in JavaScript, you should try looking up JavaScript's operators first: Mozilla Developer Center's list of operators The one exception you're likely to encounter is the $ symbol
- What does the !! (double exclamation mark) operator do in JavaScript . . .
A third use is to produce logical XOR and logical XNOR In both C and JavaScript, a b performs a logical AND (true if both sides are true), and a b performs a bitwise AND a || b performs a logical OR (true if at least one are true), and a | b performs a bitwise OR
- javascript - When should I use ?? (nullish coalescing) vs || (logical . . .
) in JavaScript only considers null or undefined as "nullish" values If the left-hand side is any other value, even falsy values like "" (empty string), 0 , or false , it will not use the right-hand side:
- What is the difference between != and !== operators in JavaScript?
Also at In JavaScript, is '!=' the same as '!=='? More answers, but this is the duplicate target More answers, but this is the duplicate target – Peter Mortensen
- How to use OR condition in a JavaScript IF statement?
In JavaScript, if you're looking for A or B, but not both, you'll need to do something similar to:
- Whats the difference between and in JavaScript?
This operator is almost never used in JavaScript Other programming languages (like C and Java) use it for performance reasons or to work with binary data In JavaScript, it has questionable performance, and we rarely work with binary data This operator expects two numbers and returns a number In case they are not numbers, they are cast to
- Is there a null coalescing operator in JavaScript?
After reading your clarification, @Ates Goral's answer provides how to perform the same operation you're doing in C# in JavaScript @Gumbo's answer provides the best way to check for null; however, it's important to note the difference in == versus === in JavaScript especially when it comes to issues of checking for undefined and or null
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