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What is the difference between `new Object()` and object literal notation?
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On my machine using Node.js, I ran the following:
console.log('Testing Array:');
console.time('using[]');
for(var i=0; i<200000000; i++){var arr = []};
console.timeEnd('using[]');
console.time('using new');
for(var i=0; i<200000000; i++){var arr = new Array};
console.timeEnd('usin...
Check if a given key already exists in a dictionary
I wanted to test if a key exists in a dictionary before updating the value for the key.
I wrote the following code:
16 Answ...
Check for null in foreach loop
...> in the answer you link to. Which have the same performance penalty of testing whether the enumerable is null.
– Rune FS
May 3 '19 at 9:36
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What is the difference between typeof and instanceof and when should one be used vs. the other?
...make things clear, you need to know two facts:
The instanceof operator tests whether the prototype property of a constructor appears anywhere in the prototypes chain of an object. In most cases this mean that the object was created by using this constructor or on of its descendant. But also prot...
Check if string ends with one of the strings from a list
... str.endswith also accepts a tuple. You don't need to loop.
>>> 'test.mp3'.endswith(('.mp3', '.avi'))
True
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Create folder with batch but only if it doesn't already exist
...e a directory only if the folder does not exist.
Note that this existence test will return true only if VTS exists and is a directory. If it is not there, or is there as a file, the mkdir command will run, and should cause an error. You might want to check for whether VTS exists as a file as well...
What is the point of a “Build Server”? [closed]
...traceable. Developers manually building code for anything except their own testing is dangerous. Too much risk of stuff not getting checked in, being out of date with other people's changes, etc. etc.
Joel Spolsky on this matter.
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Difference between rake db:migrate db:reset and db:schema:load
...ironment. If RAILS_ENV is not specified it defaults to the development and test databases.
db:create:all - Creates the database for all environments.
db:drop - Drops the database for the current RAILS_ENV environment. If RAILS_ENV is not specified it defaults to the development and test databases....
Android Webview - Webpage should fit the device screen
... work anymore. I'm the only one with this problem?
– testing
Mar 10 '16 at 9:42
@testing did you get any solution of i...
windows版 svn 服务器搭建及总结 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...y。
可以使用svnadmin 命令，格式是：
svnadmin create d:/svntest
意思是在d盘创建名为svntest仓库。 不清楚的可以用 svnadmin help 查看帮助。
这里我是将一个存储仓库做为svn的根路径，其实svn的根路径也可以是单单一个文件夹。用...