大约有 49,000 项符合查询结果（耗时：0.0610秒） [XML]
Math.random() versus Random.nextInt(int)
... bits in its mantissa, so it is uniformly distributed in the range 0 to 1-(2^-53).
Random.nextInt(n) uses Random.next() less than twice on average- it uses it once, and if the value obtained is above the highest multiple of n below MAX_INT it tries again, otherwise is returns the value modulo n...
Transparent ARGB hex value
...
205
Transparency is controlled by the alpha channel (AA in #AARRGGBB). Maximal value (255 dec, FF ...
Getting the first character of a string with $str[0]
...
Alexis Wilke
14.2k77 gold badges5151 silver badges9898 bronze badges
answered Dec 28 '09 at 23:31
HockHock
...
setState vs replaceState in React.js
...t case.
If your current state is {a: 1}, and you call this.setState({b: 2}); when the state is applied, it will be {a: 1, b: 2}. If you called this.replaceState({b: 2}) your state would be {b: 2}.
Side note: State isn't set instantly, so don't do this.setState({b: 1}); console.log(this.state) w...
Reload django object from database
...
274
As of Django 1.8 refreshing objects is built in. Link to docs.
def test_update_result(self):
...
Shell equality operators (=, ==, -eq)
...eq foo ]; echo "$?" # wrong
-bash: [: foo: integer expression expected
2
(Side note: Quote those variable expansions! Do not leave out the double quotes above.)
If you're writing a #!/bin/bash script then I recommend using [[ instead. The doubled form has more features, more natural syntax, a...
Get __name__ of calling function's module in Python
...
123
Check out the inspect module:
inspect.stack() will return the stack information.
Inside a fun...
How to convert ActiveRecord results into an array of hashes
...
212
as_json
You should use as_json method which converts ActiveRecord objects to Ruby Hashes desp...
Difference between two dates in Python
...
286
Use - to get the difference between two datetime objects and take the days member.
from datet...
Difference between float and double in php?
...|
edited Dec 11 '14 at 16:27
ratchet freak
43.8k55 gold badges5252 silver badges9999 bronze badges
answe...