大约有 42,000 项符合查询结果（耗时：0.0479秒） [XML]
Why does Haskell's “do nothing” function, id, consume tons of memory?
...
We know the type of id,
id :: a -> a
And when we specialize this for id id, the left copy of id has type:
id :: (a -> a) -> (a -> a)
And then when you specialize this again for the leftmost id in id id id, you get:
id :: ((a -> a) -> (a -> ...
Colors with unix command “watch”?
Some commands that I use display colors, but when I use them with watch the colors disappears:
6 Answers
...
Rails: Custom text for rails form_for label
...
Just go to the above link and type in the method you are looking for in the search box. label is listed under ActionView::Helpers::FormBuilder and ActionView::Helpers::FormHelper. ActionView::Helpers::FormBuilder is the one we are interested in, but t...
ReactJS: Modeling Bi-Directional Infinite Scrolling
...
This is a mix of an infinite table and an infinite scroll scenario. The best abstraction I found for this is the following:
Overview
Make a <List> component that takes an array of all children. Since we do not render them, it's really cheap to just all...
Idiomatic way to wait for multiple callbacks in Node.js
...to have a look at:
Promises
The Promise object is used for deferred and asynchronous computations.
A Promise represents an operation that hasn't completed yet, but is
expected in the future.
A popular promises library is bluebird. A would advise to have a look at why promises.
You s...
How to make a Java thread wait for another thread's output?
I'm making a Java application with an application-logic-thread and a database-access-thread.
Both of them persist for the entire lifetime of the application and both need to be running at the same time (one talks to the server, one talks to the user; when the app is fully started, I need both of t...
What is the use of the pipe symbol in YAML?
I am new to yaml, and I have a question about the pipe symbol (|) used for multiple lines. Does YAML have any syntax like the one below?
...
git - skipping specific commits when merging
I've been using Git for about a year now and think it's fantastic, but I've just started on a second version of the project and started a new branch for it. I'm struggling a little with the best way to handle things going forward.
...
How to .gitignore files recursively
...o this answer. It also works for me in Windows 7 using Sourcetree 1.6.12.0 and the version of git that it installs (1.8.4-preview20130916).
To gitignore every file and folder under a directory recursively:
MyPrject/WebApp/Scripts/special/**
...
What's better at freeing memory with PHP: unset() or $var = null
...is garbage-collected.) (bug 33595)
The question "difference between unset and = null" details some differences:
unset($a) also removes $a from the symbol table; for example:
$a = str_repeat('hello world ', 100);
unset($a);
var_dump($a);
Outputs:
Notice: Undefined variable: a in xxx
NULL
But ...