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Are there pronounceable names for common Haskell operators? [closed]
... "b pipe-to a"
!! index
! index / strict a ! b: "a index b", foo !x: foo strict x
<|> or / alternative expr <|> term: "expr or term"
++ concat / plus / append
[] empty list
: cons
:: of type / as f x :: Int: f x of type Int
\ lambda
@ ...
How to URL encode a string in Ruby
... between them is their handling of spaces:
>> ERB::Util.url_encode("foo/bar? baz&")
=> "foo%2Fbar%3F%20baz%26"
>> CGI.escape("foo/bar? baz&")
=> "foo%2Fbar%3F+baz%26"
CGI.escape follows the CGI/HTML forms spec and gives you an application/x-www-form-urlencoded string, w...
Adding data attribute to DOM
...t's essentially decoupled from the data attribute.
Example:
<div data-foo="bar"></div>
If you grabbed the value of the attribute using .data('foo'), it would return "bar" as you would expect. If you then change the attribute using .attr('data-foo', 'blah') and then later use .data('f...
Factory Pattern. When to use factory methods?
...nstructors - mostly when constructors aren't expressive enough, ie.
class Foo{
public Foo(bool withBar);
}
is not as expressive as:
class Foo{
public static Foo withBar();
public static Foo withoutBar();
}
Factory classes are useful when you need a complicated process for constructing th...
How to create a new java.io.File in memory?
...r readme:
FileSystem fs = Jimfs.newFileSystem(Configuration.unix());
Path foo = fs.getPath("/foo");
Files.createDirectory(foo);
Path hello = foo.resolve("hello.txt"); // /foo/hello.txt
Files.write(hello, ImmutableList.of("hello world"), StandardCharsets.UTF_8);
...
How to check if an object is a generator object in python?
...
>>> import inspect
>>>
>>> def foo():
... yield 'foo'
...
>>> print inspect.isgeneratorfunction(foo)
True
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...
What does enumerate() mean?
...hat to row_number and row, respectively.
Demo:
>>> elements = ('foo', 'bar', 'baz')
>>> for elem in elements:
... print elem
...
foo
bar
baz
>>> for count, elem in enumerate(elements):
... print count, elem
...
0 foo
1 bar
2 baz
By default, enumerate() starts...
Singleton: How should it be used
...to prevent people from accedentally doing so. When I have a local variable foo1 of type Foo in my small function and only want one in the function, I'm not worried that someone is going to create a second Foo varaible foo2 and use that instead of the original one.
– Thomas Edin...
An “and” operator for an “if” statement in Bash
.... For example : STATUS=; [ $STATUS -ne 13 ] 2>/dev/null && echo foo does not output foo, even though it should (empty is different from 13). What you first suggested, ${STATUS:-0} looks far better.
– Julien Vivenot
Nov 16 '12 at 0:42
...
Docker: adding a file from a parent directory
...r is to use a volume pointing to the parent folder:
#docker-composer.yml
foo:
build: foo
volumes:
- ./:/src/:ro
But I'm pretty sure the can be done playing with volumes in Dockerfile.
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