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Booleans, conditional operators and autoboxing
...
The line:
Boolean b = true ? returnsNull() : false;
is internally transformed to:
Boolean b = true ? returnsNull().booleanValue() : false;
to perform the unboxing; thus: null.booleanValue() will yield a NPE
This is one of the major pitfalls when using autoboxing. This behavior is i...
Why do some C# lambda expressions compile to static methods?
...hanged this behavior. Now, any lambda, which captures variables or not, is transformed into a display class:
Given this example:
public class C
{
public void M()
{
var x = 5;
Action<int> action = y => Console.WriteLine(y);
}
}
Native compiler output:
public ...
Why is lazy evaluation useful?
...56
That's because lazy evaluation looks at the syntax tree and does tree-transformations...
square (square (square 2))
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\/
*
/ \
\ /
square (square 2)
||
\/
*
/ \
\ /
*
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How can I tell if a DOM element is visible in the current viewport?
...that the center of the element is visible if you have rounded corners or a transform applied, as the bounding corners may not return the expected element: element.contains(efp(rect.right - (rect.width / 2), rect.bottom - (rect.height / 2)))
– Jared
Mar 10 '15 a...
Finding three elements in an array whose sum is closest to a given number
...by representing each integer as a bit vector and performing a fast Fourier transform, but that's beyond the scope of this answer.
Note: Because this is an interview question, I've cheated a little bit here: this algorithm allows the selection of the same element multiple times. That is, (-1, -1, ...
Extending an Object in Javascript
I am currently transforming from Java to Javascript, and it's a bit hard for me to figure out how to extend objects the way I want it to do.
...
After array_filter(), how can I reset the keys to go in numerical order starting at 0
... that had only the value '' from an array, and now I want to apply certain transformations on it depending on the placeholder starting from 0, but unfortunately it still retains the original index. I looked for a while and couldn't see anything, perhaps I just missed the obvious, but my question is...
Why declare unicode by string in python?
...
I made the following module called unicoder to be able to do the transformation on variables:
import sys
import os
def ustr(string):
string = 'u"%s"'%string
with open('_unicoder.py', 'w') as script:
script.write('# -*- coding: utf-8 -*-\n')
script.write('_ustr ...
Disable git EOL Conversions
...within the repo.
With Git 2.8+ (March 2016), check if there are still eol transformation with:
git ls-files --eol
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解决Scrapy警告:You do not have a working installation of the service_i...
...g-installation-of-the-service_identity-module使用scrapy进行爬虫项目的操作时，出现如下错误：从提示错误来看，我们需要安装一个模块service_identity，根据提示地址（https: pypi python org pypi service_identity）来安装 使用scrapy进行爬虫项目的...