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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 ...
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...
How to fix “ImportError: No module named …” error in Python?
...
Do you have a file called __init__.py in the foo directory? If not then python won't recognise foo as a python package.
See the section on packages in the python tutorial for more information.
...
Add new methods to a resource controller in Laravel
... to that method separately, before you register the resource:
Route::get('foo/bar', 'FooController@bar');
Route::resource('foo', 'FooController');
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How do I replace the *first instance* of a string in .NET?
...ample:
using System.Text.RegularExpressions;
...
Regex regex = new Regex("foo");
string result = regex.Replace("foo1 foo2 foo3 foo4", "bar", 1);
// result = "bar1 foo2 foo3 foo4"
The third parameter, set to 1 in this case, is the number of occurrences of the regex pattern that you wa...