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  1. What does the !! (double exclamation mark) operator do in …

    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 …

  2. How do you use the ? : (conditional) operator in JavaScript?

    Jun 7, 2011 · 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 …

  3. Is there a "null coalescing" operator in JavaScript?

    Jan 25, 2009 · 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 …

  4. operators - What do ">>" and "<<" mean in Javascript? - Stack …

    Aug 9, 2011 · The snippet in question uses these operators to "parse" the three components of a 32 bits float value (sign, exponent and fraction). For example, in the question's snippet: 1 - …

  5. Which equals operator (== vs ===) should be used in JavaScript ...

    Dec 11, 2008 · The strict equality operator (===) behaves identically to the abstract equality operator (==) except no type conversion is done, and the types must be the same to be …

  6. What is the difference between != and !== operators in JavaScript?

    Dec 11, 2009 · 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?

  7. JavaScript comparison operators: Identity vs. Equality

    Aug 9, 2016 · I've been trying to understand the difference between JavaScript's comparison operators: identity and equality. From what I've read, if you check the equality of two objects …

  8. operators - What's the difference between = and == in JavaScript ...

    Jun 24, 2019 · The very widely known book JavaScript: The Definitive Guide uses the term "Identity operators". it probably originated here (or at least became much more common).

  9. 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 …

  10. What's 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 …