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  1. 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 …

  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 try …

  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 its left-hand-side …

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

    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 - (2*(b1 >> 7)) …

  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 considered equal. …

  6. 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 using ==, …

  7. 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?

  8. 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 …

  9. 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).

  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 performance, …