大约有 44,000 项符合查询结果（耗时：0.0609秒） [XML]
How can I check if a Perl array contains a particular value?
... turn the array into a hash:
my %params = map { $_ => 1 } @badparams;
if(exists($params{$someparam})) { ... }
You can also add more (unique) params to the list:
$params{$newparam} = 1;
And later get a list of (unique) params back:
@badparams = keys %params;
...
Check if bash variable equals 0 [duplicate]
I have a bash variable depth and I would like to test if it equals 0. In case yes, I want to stop executing of script. So far I have:
...
How can I check for an empty/undefined/null string in JavaScript?
I saw this question , but I didn't see a JavaScript specific example. Is there a simple string.Empty available in JavaScript, or is it just a case of checking for "" ?
...
Check if element is visible in DOM
Is there any way that I can check if an element is visible in pure JS (no jQuery) ?
18 Answers
...
How to use OR condition in a JavaScript IF statement?
...
Simply use the logical "OR" operator, that is ||.
if (A || B)
share
|
improve this answer
|
follow
|
...
How to tell if a JavaScript function is defined
How do you tell if a function in JavaScript is defined?
21 Answers
21
...
Create directory if it does not exist
I am writing a PowerShell script to create several directories if they do not exist.
11 Answers
...
DROP IF EXISTS VS DROP?
Can someone tell me if there is any difference between
5 Answers
5
...
How to check if there's nothing to be committed in the current branch?
...dition you care about separately. One might not always care, for example, if there are untracked files in the output of git status.
For example, to see if there are any local unstaged changes, you can look at the return code of:
git diff --exit-code
To check if there are any changes that are st...
LINQ Single vs First
...
If you're expecting a Single record, it's always good to be explicit in your code.
I know others have written why you use one or the other, but I thought I'd illustrate why you should NOT use one, when you mean the other.
Not...