安裝中文字典英文字典辭典工具!
安裝中文字典英文字典辭典工具!
|
- What does lt; gt; (angle brackets) mean in MS-SQL Server?
30 <> 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
- How do you use the ? : (conditional) operator in JavaScript?
What is the ?: (question mark and colon operator aka conditional or quot;ternary quot;) operator and how can I use it?
- math - What does the ^ (XOR) operator do? - Stack Overflow
The XOR ( ^ ) is an logical operator that will return 1 when the bits are different and 0 elsewhere A negative number is stored in binary as two's complement In 2's complement, The leftmost bit position is reserved for the sign of the value (positive or negative) and doesn't contribute towards the value of number
- What does the !! (double exclamation mark) operator do in JavaScript . . .
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
- What does the `%` (percent) operator mean? - Stack Overflow
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
- What are bitwise shift (bit-shift) operators and how do they work?
The Operators >> is the arithmetic (or signed) right shift operator >>> is the logical (or unsigned) right shift operator << is the left shift operator, and meets the needs of both logical and arithmetic shifts All of these operators can be applied to integer values (int, long, possibly short and byte or char)
- 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 For example: 10101000 11101001 Original (Binary for -22,295 in 16-bit two's complement) 01010111 00010110 ~Original (Binary for
- 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)
|
|
|