It Operator Jobspitpoint - Top Viral
The !! operator reassures the lint tool that what you wrote is what you meant: do this operation, then take the truth value of the result. A third use is to produce logical XOR and logical XNOR.
Understanding the Context
What does the !! (double exclamation mark) operator do in JavaScript ... <> operator means not equal to in MS SQL. It compares two expressions (a comparison operator).
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Key Insights
When you compare nonnull expressions, the result is TRUE if the left operand is not equal to the right operand; otherwise, the result is FALSE. If either or both operands are NULL, see the topic SET ANSI_NULLS (Transact-SQL). See here : Not Equal To Also check : 1) Not equal <> != operator on NULL 2 ... 1 That is the modulo operator, which finds the remainder of division of one number by another. So in this case a will be the remainder of b divided by c.
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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. Reference: JavaScript Tutorial: Comparison Operators The == operator will compare for equality after doing any necessary type conversions. The === operator will not do the conversion, so if two values are not the ... Which equals operator (== vs ===) should be used in JavaScript ... What is the ?: (question mark and colon operator aka. conditional or "ternary") operator and how can I use it?
The & operator does "run these 3 functions, and if one of them returns false, execute the else block", while the | does "only run the else block if none return false" - can be useful, but as said, often it's a design smell. There is a Second use of the | and & operator though: Bitwise Operations.