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What is the Sign Off feature in Git for?
...t, especially with patches.” — That’s almost certainly wrong (specifically the first sentence). As a counter-example, see for example b2c150d3aa (linked to in VonC’s answer), which has two signed-off-by headers; one by the author, and one by the maintainer. This is common practice in the Gi...
Understanding the map function
...ld recommend using list comprehensions instead:
map(f, iterable)
is basically equivalent to:
[f(x) for x in iterable]
map on its own can't do a Cartesian product, because the length of its output list is always the same as its input list. You can trivially do a Cartesian product with a list co...
Apache Commons equals/hashCode builder [closed]
...n allows for short-circuiting the evaluation if an earlier Object.equals() call returns false (to be fair: commons / lang has an ObjectUtils.equals(obj1, obj2) method with identical semantics which could be used instead of EqualsBuilder to allow short-circuiting as above).
So: yes, the commons lang...
What is a mixin, and why are they useful?
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@hillel good point, but keep in mind that Python will call superclasses' methods from left to right (when you need to override the constructor, for example).
– Eliseu Monar dos Santos
Jun 16 '15 at 8:23
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What is the difference between require() and library()?
...t; test <- library("abc")
Error in library("abc") : there is no package called 'abc'
> test
Error: object 'test' not found
> test <- require("abc")
Loading required package: abc
Warning message:
In library(package, lib.loc = lib.loc, character.only = TRUE, logical.return = TRUE, :
the...
Getting all names in an enum as a String[]
...etEnumConstants()).replaceAll("^.|.$", "").split(", ");
}
That you would call like this:
String[] names = getNames(State.class); // any other enum class will work
If you just want something simple for a hard-coded enum class:
public static String[] names() {
return Arrays.toString(State.va...
jQuery: find element by text
...f it's possible to find an element based on its content rather than by an id or class ?
7 Answers
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How to set default values in Rails?
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Try it. It'll work on new model objects called with the .new class method. That blog post's discussion about ActiveRecord directly calling .allocate was about model objects loaded with existing data from the database. (And it's a terrible idea for ActiveRecord to...
Random float number generation
...n will often not be sufficient if you need truly random numbers.
Before calling rand(), you must first "seed" the random number generator by calling srand(). This should be done once during your program's run -- not once every time you call rand(). This is often done like this:
srand (static_c...
jQuery - Illegal invocation
...his helps me remember that it represents a jQuery object which helps avoid calling a method on something that's a string or trying to manipulate a string with .toString() or something when it's a jQuery object.
– timbrown
Apr 16 '13 at 15:13
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