大约有 44,000 项符合查询结果（耗时：0.0700秒） [XML]
How to check if a file exists in Go?
Go's standard library does not have a function solely intended to check if a file exists or not (like Python's os.path.exists ). What is the idiomatic way to do it?
...
Pythonic way to check if a file exists? [duplicate]
Which is the preferred way to check if a file exists and if not create it?
5 Answers
5...
Check if multiple strings exist in another string
How can I check if any of the strings in an array exists in another string?
15 Answers
...
How to detect my browser version and operating system using JavaScript?
...set,ix;
// In Opera, the true version is after "Opera" or after "Version"
if ((verOffset=nAgt.indexOf("Opera"))!=-1) {
browserName = "Opera";
fullVersion = nAgt.substring(verOffset+6);
if ((verOffset=nAgt.indexOf("Version"))!=-1)
fullVersion = nAgt.substring(verOffset+8);
}
// In MSIE, the t...
How to check if the string is empty?
... they are considered false in a Boolean context, so you can just do this:
if not myString:
This is the preferred way if you know that your variable is a string. If your variable could also be some other type then you should use myString == "". See the documentation on Truth Value Testing for ot...
Javascript: How to check if a string is empty? [duplicate]
...
I check length.
if (str.length == 0) {
}
share
|
improve this answer
|
follow
|
...
Is “else if” faster than “switch() case”? [duplicate]
...
For just a few items, the difference is small. If you have many items you should definitely use a switch.
If a switch contains more than five items, it's implemented using a lookup table or a hash list. This means that all items get the same access ti...
Java FileOutputStream Create File if not exists
Is there a way to use FileOutputStream in a way that if a file (String filename) does not exist, then it will create it?
9 ...
Generic TryParse
I am trying to create a generic extension that uses 'TryParse' to check if a string is a given type:
23 Answers
...
How to check if mysql database exists
Is it possible to check if a (MySQL) database exists after having made a connection.
21 Answers
...