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Will console.log reduce JavaScript execution performance?
...also causes a performance hit. This came to my attention as I was logging "called" within a function that got invoked on hundreds of React components during re-renders. The mere presence of the logging code caused very noticeable stutter during frequent updates.
– Lev
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Difference between method and function in Scala
...ote that, on the JVM, these (method values) are implemented with what Java calls "methods".
A Function Declaration is a def declaration, including type and body. The type part is the Method Type, and the body is an expression or a block. This is also implemented on the JVM with what Java calls "me...
git stash blunder: git stash pop and ended up with merge conflicts
...removed from the stash list. You need to resolve the conflicts by hand and call git stash drop manually afterwards.
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Why in Java 8 split sometimes removes empty strings at start of result array?
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The behavior of String.split (which calls Pattern.split) changes between Java 7 and Java 8.
Documentation
Comparing between the documentation of Pattern.split in Java 7 and Java 8, we observe the following clause being added:
When there is a positive-widt...
How to style CSS role
...e not wrong, but they rely on you using either a div or using the specific id. With this selector, you'll be able to have all kinds of crazy markup and it would still work and you avoid problems with specificity.
[role=main] {
background: rgba(48, 96, 144, 0.2);
}
div,
span {
padding: ...
MySQL复制的概述、安装、故障、技巧、工具 - 数据库(内核) - 清泛网 - 专注...
... REPLICATION SLAVE ON *.*
TO '<SLAVE_USER>'@'<SLAVE_HOST>'
IDENTIFIED BY '<SLAVE_PASSWORD>';
注：出于安全性和灵活性的考虑，不要把root等具有SUPER权限用户作为复制账号。
然后设置主服务器配置文件（缺省：/etc/my.cnf）：
[mysqld]
se...
Rails: How does the respond_to block work?
....html
The Responder does NOT contain a method for .html or .json, but we call these methods anyways! This part threw me for a loop.
Ruby has a feature called method_missing. If you call a method that doesn't exist (like json or html), Ruby calls the method_missing method instead.
http://ruby-met...
Is it possible to make abstract classes in Python?
...initions of those methods:
>>> Abstract()
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
TypeError: Can't instantiate abstract class Abstract with abstract methods foo
>>> class StillAbstract(Abstract):
... pass
...
>>> StillAbst...
Run a Python script from another Python script, passing in arguments [duplicate]
...
@macdonjo: No, the os.system() call waits until the thing you called finishes before continuing. You could use subprocess.Popen() and manage the new processes yourself, or use the multiprocessing module, or various other solutions.
– ...
Is nested function a good approach when required by only one function? [closed]
...xb772b304>
>>> a()
4
Is this what you were looking for? It's called a closure.
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