大约有 15,000 项符合查询结果（耗时：0.0282秒） [XML]
How to format numbers? [duplicate]
...oLocaleString() with minimumFractionDigits. Browser compatibility for the extended options on toLocaleString() was limited when I first wrote this answer, but the current status looks good.
var n = 100000;
var value = n.toLocaleString(
undefined, // leave undefined to use the browser's locale,...
Ruby, Difference between exec, system and %x() or Backticks
...You have to provide the command as a string argument to this method. For example:
>> system("date")
Wed Sep 4 22:03:44 CEST 2013
=> true
The invoked program will use the current STDIN, STDOUT and STDERR objects of your Ruby program. In fact, the actual return value is either true, false...
Counting the Number of keywords in a dictionary in python
...ill negligible in comparison to whatever else your program is doing.
d = {x: x**2 for x in range(1000)}
len(d)
# 1000
len(d.keys())
# 1000
%timeit len(d)
# 41.9 ns ± 0.244 ns per loop (mean ± std. dev. of 7 runs, 10000000 loops each)
%timeit len(d.keys())
# 83.3 ns ± 0.41 ns per loop (mean ...
What does Python's eval() do?
... eval function lets a Python program run Python code within itself.
eval example (interactive shell):
>>> x = 1
>>> eval('x + 1')
2
>>> eval('x')
1
share
|
improve this...
Why doesn't Dictionary have AddRange?
...ut in a manner that fits with the Framework guidelines.
AddRange doesn't exist because a range doesn't have any meaning to an associative container, as the range of data allows for duplicate entries. E.g if you had an IEnumerable<KeyValuePair<K,T>> that collection does not guard against...
What is an NP-complete in computer science?
...vable in realistic time.
Edit: As others have noted, there are often approximate solutions for NP-Complete problems. In this case, the approximate solution usually gives an approximation bound using special notation which tells us how close the approximation is.
...
Pass Variables by Reference in Javascript
...orld"
You can iterate over the properties of an array with a numeric index and modify each cell of the array, if you want.
var arr = [1, 2, 3];
for (var i = 0; i < arr.length; i++) {
arr[i] = arr[i] + 1;
}
It's important to note that "pass-by-reference" is a very specific term. It doe...
Build android release apk on Phonegap 3.x CLI
How can I build an android app locally using the Phonegap 3.x CLI, ready to release? I check the bin folder generated inside the platforms/android directory of the project, and only has .debug APKs.
...
Obfuscated C Code Contest 2006. Please explain sykes2.c
...p; main(-~_);
putchar(--_%64
? 32 | -~7[__TIME__-_/8%8][">'txiZ^(~z?"-48] >> ";;;====~$::199"[_*2&8|_/64]/(_&2?1:8)%8&1
: 10);
}
Introducing variables to untangle this mess:
main(int i) {
if(i^448)
main(-~i);
if(--i % 64) {
char a =...