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How do I change read/write mode for a file using Emacs?
... is set to read only mode, how do I change it to write mode and vice versa from within Emacs?
9 Answers
...
How to generate random SHA1 hash to use as ID in node.js?
...nter by 1 million, we get the probability of the length of number returned from Math.random.
len frequency(%)
------------------
13 0.0004
14 0.0066
15 0.0654
16 0.6768
17 6.6703
18 61.133 <- highest probability
19 28.089 <- second highest probability
20 ...
Python Sets vs Lists
...st(iterable):
... for i in iterable:
... pass
...
>>> from timeit import timeit
>>> timeit(
... "iter_test(iterable)",
... setup="from __main__ import iter_test; iterable = set(range(10000))",
... number=100000)
12.666952133178711
>>> timeit(
... ...
Cast Int to enum in Java
...ic enum MyEnum {
EnumValue1,
EnumValue2;
public static MyEnum fromInteger(int x) {
switch(x) {
case 0:
return EnumValue1;
case 1:
return EnumValue2;
}
return null;
}
}
...
Why does GCC generate such radically different assembly for nearly the same C code?
...do the best job, make the fastest code, etc. Actually I saw gcc get worse from 3.x to 4.x on arm at least. 4.x might have caught up to 3.x by this point, but early on it produced slower code. With practice you can learn how to write your code so the compiler doesn't have to work as hard and as a ...
Unicode character in PHP string
...ectly.
As also mentioned by others, the only way to obtain a string value from any sensible Unicode character description in PHP, is by converting it from something else (e.g. JSON parsing, HTML parsing or some other form). But this comes at a run-time performance cost.
However, there is one other...
What exactly does stringstream do?
...write about every possible aspect and use-case.
Note: I probably stole it from someone on SO and refined, but I don't have original author noted.
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When to use valueChangeListener or f:ajax listener?
...be invoked when the form is submitted and the submitted value is different from the initial value. It's thus not invoked when only the HTML DOM change event is fired. If you would like to submit the form during the HTML DOM change event, then you'd need to add another <f:ajax/> without a liste...
Sorting a set of values [closed]
...
From a comment:
I want to sort each set.
That's easy. For any set s (or anything else iterable), sorted(s) returns a list of the elements of s in sorted order:
>>> s = set(['0.000000000', '0.009518000', '10.27...
What is the difference between LR, SLR, and LALR parsers?
... shift occurs: the semantic action for G is called, the stack is popped n (from Rn) times, the pair (S,G) is pushed onto the stack, the new state S' is set to GOTO(G), and the cycle repeats with the same token T. If the parser is an SLR parser, there is at most one reduction rule for the state and s...