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What's the difference between console.dir and console.log?
...earest example of a difference is a regular expression:
> console.log(/foo/);
/foo/
> console.dir(/foo/);
* /foo/
global: false
ignoreCase: false
lastIndex: 0
...
You can also see a clear difference with arrays (e.g., console.dir([1,2,3])) which are logged differently from ...
How to get “wc -l” to print just the number of lines without file name?
...unt; for line count you'd do wc -l. echo -n omits the trailing line break.
FOO="bar"
echo -n "$FOO" | wc -c # " 3" (x)
echo -n "$FOO" | wc -c | bc # "3" (√)
echo -n "$FOO" | wc -c | tr -d ' ' # "3" (√)
echo -n...
How to call methods dynamically based on their name? [duplicate]
... dispatch. It’s very easy in Ruby, just use public_send:
method_name = 'foobar'
obj.public_send(method_name) if obj.respond_to? method_name
If the method is private/protected, use send instead, but prefer public_send.
This is a potential security risk if the value of method_name comes from the...
When is “i += x” different from “i = i + x” in Python?
... then x + y tries to call y.__radd__(x). So, in the case where you have
foo_instance += bar_instance
if Foo doesn't implement __add__ or __iadd__ then the result here is the same as
foo_instance = bar_instance.__radd__(bar_instance, foo_instance)
2In the expression foo_instance + bar_instance...
CSS attribute selector does not work a href
...ng.
a[href$='.pdf'] { /*css*/ }
JSFiddle: http://jsfiddle.net/UG9ud/
E[foo] an E element with a "foo" attribute (CSS 2)
E[foo="bar"] an E element whose "foo" attribute value is exactly equal to "bar" (CSS 2)
E[foo~="bar"] an E element whose "foo" attribute value is a list of whitespace-s...
In Python, how do I iterate over a dictionary in sorted key order?
...in a loop in a way very much like a dict, but it is not in anyway a dict!
foo = {
'a': 1,
'b': 2,
'c': 3,
}
print foo
>>> {'a': 1, 'c': 3, 'b': 2}
print foo.items()
>>> [('a', 1), ('c', 3), ('b', 2)]
print sorted(foo.items())
>>> [('a', 1), ('b...
How to unpack and pack pkg file?
...u really do just need to edit one of the info files, that's simple:
mkdir Foo
cd Foo
xar -xf ../Foo.pkg
# edit stuff
xar -cf ../Foo-new.pkg *
But if you need to edit the installable files:
mkdir Foo
cd Foo
xar -xf ../Foo.pkg
cd foo.pkg
cat Payload | gunzip -dc |cpio -i
# edit Foo.app/*
rm Payloa...
Find object by id in an array of JavaScript objects
...
Use the find() method:
myArray.find(x => x.id === '45').foo;
From MDN:
The find() method returns the first value in the array, if an element in the array satisfies the provided testing function. Otherwise undefined is returned.
If you want to find its index instead, use ...
如何编写一个独立的 PHP 扩展（译） - 更多技术 - 清泛网 - 专注C/C++及内核技术
... PHP 源码。
定义一个新扩展
我们给示例扩展命名为 “foobar”。
新扩展包含两个资源文件：foo.c 和 bar.c（还有一些头文件，但这些不只重要）。
示例扩展不引用任何外部的库（这点很重要，因为这样用户就不需要特别指定一...
How to convert a std::string to const char* or char*?
...st character pointer.
1. Use the contiguous storage of C++11
std::string foo{"text"};
auto p = &*foo.begin();
Pro
Simple and short
Fast (only method with no copy involved)
Cons
Final '\0' is not to be altered / not necessarily part of the non-const memory.
2. Use std::vector<CharT...