2008年8月29日 · I have always used || (two pipes) in OR expressions, both in C# and PHP. Occasionally I see a single pipe used: |. What is the difference between those two usages? …

2009年2月7日 · What is the difference between == and === in JavaScript? I have also seen != and !== operators. Are there more such operators?

2012年7月23日 · I have a query that is gathering information based on a set of conditions. Basically I want to know if a location has paid out more than $50 for the day OR the comment …

Original Question && is notoriously hard to search for on Google Search, but the best I've found is this article which says to use -and. Unfortunately it doesn't give any more information, and I …

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 …

2011年11月30日 · What everybody answered is correct. I would add they are useless. /^.*(…).*$/ is exactly the same as /(…)/.

2017年7月25日 · “&”这个符号按照以下图片所示一笔手写成。 &是逻辑语言，逻辑上表示两者属于缺一不可的关系，还可以表示一个人和另外一个人之意，与and同义。如A&B，表示A与B,A …

The MSDN/Technet URL now redirects to a page saying "The Windows PowerShell 1.0 Owner’s Manual has been retired. For the most up-to-date Windows PowerShell content, go to Using …

2018年4月3日 · The & operator performs a bit-wise and operation on its integer operands, producing an integer result. Thus (8 & 4) is (0b00001000 bitand 0b00000100) (using a binary …

2025年2月26日 · Kakeya猜想本身应该是几何测度论当中的问题，但它的提出确实最早可以追溯到分析：考虑任意一个 \mathbb {R}^2 上的可积函数，是不是都可以找到一个方向及其法向确定 …