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- javascript - When should I use ?? (nullish coalescing) vs || (logical . . .
The nullish coalescing operator (??) 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 does the !! (double exclamation mark) operator do in JavaScript . . .
Novice JavaScript developers need to know that the "not not" operator is using implicitly the original loose comparison method instead of the exact === or !== operators and also the hidden cast operation that is happening behind the scenes and I show it in the example I provide
- How do you use the ? : (conditional) operator in JavaScript?
27 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
- Which equals operator (== vs ===) should be used in JavaScript . . .
I'm using JSLint to go through JavaScript, and it's returning many suggestions to replace == (two equals signs) with === (three equals signs) when doing things like comparing idSele_UNVEHtype value
- Is there a null coalescing operator in JavaScript?
JavaScript now supports the nullish coalescing operator (??) It returns its right-hand-side operand when its left-hand-side operand is null or undefined, and otherwise returns its left-hand-side operand
- JavaScript OR (||) variable assignment explanation - Stack Overflow
That is, JavaScript "short-circuits" the evaluation of Boolean operators and will return the value associated with either the first non-false variable value or whatever the last variable contains See Anurag's explanation of those values that will evaluate to false Using this technique is not good practice for several reasons; however
- What is the difference between != and !== operators in JavaScript?
What is the difference between the !== operator and the != operator in JavaScript? Does it behave similarly to the === operator where it compares both value and type?
- What does ${} (dollar sign and curly braces) mean in a string in . . .
What does $ {} (dollar sign and curly braces) mean in a string in JavaScript? Asked 9 years, 11 months ago Modified 2 years, 2 months ago Viewed 429k times
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