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What does <> (angle brackets) mean in MS-SQL Server?
<> operator means not equal to in MS SQL. It compares two expressions (a comparison operator). 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

What is the difference between the | and || or operators?
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.

c - What does tilde (~) operator do? - Stack Overflow
The ~ operator in C++ (and other C-like languages like C and Java) performs a bitwise NOT operation - all the 1 bits in the operand are set to 0 and all the 0 bits in the operand are set to 1. In other words, it creates the complement of the original number.

What does the `%` (percent) operator mean? - Stack Overflow
Note that the result of the % operator is equal to x – (x / y) * y and that if y is zero, a DivideByZeroException is thrown. If x and y are non-integer values x % y is computed as x – n * y, where n is the largest possible integer that is less than or equal to x / y (more details in the C# 4.0 Specification in section 7.8.3 Remainder operator).

How do you use the ? : (conditional) operator in JavaScript?
Just to clarify the name: ternary is the type of operator (i.e. it has 3 parts). The name of that specific ternary operator is the conditional operator. There just happens to only be one ternary operator in JS so the terms get misused. –

What does the "->" operator mean in C++? - Stack Overflow
The -> operator is used with a pointer (or pointer-like object) on the LHS and a structure or class member on the RHS (lhs->rhs). It is generally equivalent to (*lhs).rhs, which is the other way of accessing a member.

What is the difference between increment operator(++) and addition ...
The difference between using the increment operator(ie. value++) vs using the addition operator(ie. value + 1) is that the first one sometimes can cause mutation especially if we are accessing a global variable inside a function; Using increment operator.

When should I use ?? (nullish coalescing) vs || (logical OR)?
The ?? operator was added to TypeScript 3.7 back in November 2019. And more recently, the ?? operator was included in ES2020, which is supported by Node 14 (released in April 2020). When the nullish coalescing operator ?? is supported, I typically use it instead of the OR operator || (unless there's a good reason not to).

What's the right way to overload operator== for a class hierarchy?
bool operator==(const B& lhs, const B& rhs) { return lhs.isEqual( rhs ) && lhs.bar == rhs.bar; } By avoiding having an operator== that works on abstract base classes and keeping compare functions protected, you don't ever get accidentally fallbacks in client code where only the base part of two differently typed objects are compared.

Which equals operator (== vs ===) should be used in JavaScript ...
The === operator is called a strict comparison operator, it does differ from the == operator. Lets take 2 vars a and b. For "a == b" to evaluate to true a and b need to be the same value. In the case of "a === b" a and b must be the same value and also the same type for it to evaluate to true. Take the following example

 

 

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