Difference between == and === in JavaScript - Stack Overflow
2009年2月7日 · 1210. === and !== are strict comparison operators: JavaScript has both strict and type-converting equality comparison. For strict equality the objects being compared must have the same type and: Two strings are strictly equal when they have the same sequence of characters, same length, and same characters in corresponding positions. Two numbers ...
Which equals operator (== vs ===) should be used in JavaScript ...
2008年12月11日 · 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 same type === …
What is the difference between the | and || or operators?
2008年8月29日 · Good question. These two operators work the same in PHP and C#. | is a bitwise OR. It will compare two values by their bits. E.g. 1101 | 0010 = 1111. This is extremely useful when using bit options. E.g. Read = 01 (0X01) Write = 10 (0X02) Read-Write = 11 (0X03). One useful example would be opening files.
An "and" operator for an "if" statement in Bash - Stack Overflow
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What is the difference between & and && in Java?
2011年4月9日 · While && operator will stop evaluating the second argument if the first argument's result is false. One more difference between these two is, Bitwise & operator is applicable for boolean as well as integral types. While short-circuit && operator is applicable only for the boolean type. We can write.
java - && (AND) and || (OR) in IF statements - Stack Overflow
Java has 5 different boolean compare operators: &, &&, |, ||, ^. & and && are "and" operators, | and || "or" operators, ^ is "xor". The single ones will check every parameter, regardless of the values, before checking the values of the parameters. The double ones will first check the left parameter and its value and if true (||) or false ...
Can I get "&&" or "-and" to work in PowerShell? - Stack Overflow
In CMD, '&&' means "execute command 1, and if it succeeds, execute command 2". I have used it for things like: build && run_tests. In PowerShell, the closest thing you can do is: (build) -and (run_tests) It has the same logic, but the output text from the commands is lost. Maybe it is good enough for you, though.
Regular Expressions: Is there an AND operator? - Stack Overflow
2009年1月22日 · The OR operator has instead to be specified with a pipe. The following RegExp: var re = /ab/; means the letter a AND the letter b. It also works with groups: var re = /(co)(de)/; it means the group co AND the group de. Replacing the (implicit) AND with an OR would require the following lines: var re = /a|b/;
Logical operators ("and", "or") in DOS batch - Stack Overflow
2010年1月26日 · (1) Supported by the following points: The presence of the cmd and windows-console tags;; Prior experience of some people failing to recognise the very real difference between cmd and MS-DOS batch languages, and conflating DOC with the cmd terminal window;
What is Python's equivalent of && (logical-and) in an if-statement?
Some of the operators you may know from other languages have a different name in Python. The logical operators && and || are actually called and and or. Likewise the logical negation operator ! is called not. So you could just write: if len(a) % 2 == 0 and len(b) % 2 == 0: or even: if not (len(a) % 2 or len(b) % 2):