大约有 30,000 项符合查询结果（耗时：0.0534秒） [XML]
Why does javascript map function return undefined?
...
You aren't returning anything in the case that the item is not a string. In that case, the function returns undefined, what you are seeing in the result.
The map function is used to map one value to another, but it looks you actually want to filter the array, which a map function is not s...
Android应用开发性能优化完全分析 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...其他潜在性能优化技巧，具体如下探讨。
4-1 Android应用String/StringBuilder/StringBuffer优化建议
字符串操作在Android应用开发中是十分常见的操作，也就是这个最简单的字符串操作却也暗藏很多潜在的性能问题，下面我们实例来说说...
How can I use PHP to dynamically publish an ical file to be read by Google Calendar?
...l($timestamp) {
return date('Ymd\Tgis\Z', $timestamp);
}
function escapeString($string) {
return preg_replace('/([\,;])/','\\\$1', $string);
}
$eol = "\r\n";
$load = "BEGIN:VCALENDAR" . $eol .
"VERSION:2.0" . $eol .
"PRODID:-//project/author//NONSGML v1.0//EN" . $eol .
...
How to use SharedPreferences in Android to store, fetch and edit values [closed]
...s(
"com.example.app", Context.MODE_PRIVATE);
To read preferences:
String dateTimeKey = "com.example.app.datetime";
// use a default value using new Date()
long l = prefs.getLong(dateTimeKey, new Date().getTime());
To edit and save preferences
Date dt = getSomeDate();
prefs.edit().putLo...
How to extract a string using JavaScript Regex?
I'm trying to extract a substring from a file with JavaScript Regex. Here is a slice from the file :
5 Answers
...
Show or hide element in React
... && false && 2; // will output false
true && 'some string'; // will output 'some string'
opened && <SomeElement />; // will output SomeElement if `opened` is true, will output false otherwise (and false will be ignored by react during rendering)
// be careful wi...
PowerShell and the -contains operator
...
The -Contains operator doesn't do substring comparisons and the match must be on a complete string and is used to search collections.
From the documentation you linked to:
-Contains
Description: Containment operator. Tells whether a collection of referenc...
Split string using a newline delimiter with Python
I need to delimit the string which has new line in it. How would I achieve it? Please refer below code.
5 Answers
...
Remove element by id
... complicated. Just pass the element itself to the function instead of a id string. This way the element is accessible in the whole function plus it stays a one liner
– David Fariña
Sep 29 '16 at 8:52
...
Which characters are valid/invalid in a JSON key name?
...here any forbidden characters in key names, for JavaScript objects or JSON strings? Or characters that need to be escaped?
...