大约有 40,000 项符合查询结果（耗时：0.0483秒） [XML]
Why use a prime number in hashCode?
...now something about the set of input values and the set's regularities, in order to write a function that's designed to strip them of those regularities, so the values in the set don't collide in the same hash buckets. Multiplying/Dividing/Moduloing by a prime number achieves that affect, because i...
How to append one file to another in Linux from the shell?
...w-zero-length file onto itself. This makes sense when you think about the order in which the operations could and should occur but is subtle enough that it catches many people by surprise. So if nothing else, eumiro and you have prompted a further improvement to the answer. Thanks for that!
...
How to read a file into a variable in shell?
... all.
My approach now uses read along with the printf builtin's -v flag in order to read the contents of stdin directly into a variable.
# Reads stdin into a variable, accounting for trailing newlines. Avoids
# needing a subshell or command substitution.
# Note that NUL bytes are still unsupported, ...
How to delete a row by reference in data.table?
...
the approach that i have taken in order to make memory use be similar to in-place deletion is to subset a column at a time and delete. not as fast as a proper C memmove solution, but memory use is all i care about here. something like this:
DT = data.table(c...
What's the best way to retry an AJAX request on failure using jQuery?
...der is making sure the $.ajax method wasn't already wrapped previously, in order to avoid the same code running twice.
You can copy-paste these snippets (as-is) to the console to test them
share
|
...
How to make “if not true condition”?
...
Here is an answer by way of example:
In order to make sure data loggers are online a cron script runs every 15 minutes that looks like this:
#!/bin/bash
#
if ! ping -c 1 SOLAR &>/dev/null
then
echo "SUBJECT: SOLAR is not responding to ping" | ssmtp abc@d...
How to set transform origin in SVG
...nsform uses the same notation as for SVGs, so the same six numbers in that order should work.
– Peter Collingridge
Aug 1 '14 at 11:17
1
...
How to convert Milliseconds to “X mins, x seconds” in Java?
...
You should do a checking there for single/multiple, in order to avoid this kind of situation : 1 Days 1 Hours 1 Minutes 1 Seconds
– Daniel
Jul 2 '14 at 7:21
...
Conveniently map between enum and int / String
...ske uses an id just because the ordinal changes when the enum values get reordered.
– extraneon
Feb 16 '11 at 19:52
No...
How to access command line arguments of the caller inside a function?
... note that itterating the array like that causes the args to be in reverse order from the command line.
– Andrew Backer
Nov 30 '11 at 7:26
add a comment
| ...