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Dynamic variable names in Bash
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Use an associative array, with command names as keys.
# Requires bash 4, though
declare -A magic_variable=()
function grep_search() {
magic_variable[$1]=$( ls | tail -1 )
echo ${magic_variable[$1]}
}
If you can't use associative arrays (e.g...
Disable button in jQuery
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edited Sep 17 '14 at 13:37
community wiki
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How do I get the real .height() of a overflow: hidden or overflow: scroll div?
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edited Nov 30 '16 at 13:41
Mosh Feu
21.9k1212 gold badges6868 silver badges105105 bronze badges
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Named routes _path vs _url
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_path helpers provide a site-root-relative path. You should probably use this most of the time.
_url helpers provide an absolute path, including protocol and server name. I've found that I mainly use these in emails when creating links to the app on...
getenv() vs. $_ENV in PHP
...ly the same, except that getenv will look for the variable in a case-insensitive manner. Most of the time it probably doesn't matter, but one of the comments on the documentation explains:
For example on Windows $_SERVER['Path'] is like you see, with the first letter capitalized, not 'PATH' as...
How do I remove all .pyc files from a project?
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edited Jul 17 '18 at 9:27
Mark Amery
98.8k4848 gold badges336336 silver badges379379 bronze badges
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How do I perform the SQL Join equivalent in MongoDB?
... use cases for $lookup, but at least as of 3.2 doing join is now possible with MongoDB.
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How can I output leading zeros in Ruby?
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If the maximum number of digits in the counter is known (e.g., n = 3 for counters 1..876), you can do
str = "file_" + i.to_s.rjust(n, "0")
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【解决】scrapyd启动job时报错：exceptions.TypeError: __init__() got an ...
【解决】scrapyd启动job时报错：exceptions.TypeError: __init__() got an unexpected keyword argument '_job'进入项目spiders目录, 修改 spider py 文件（你自己的spider的主文件）：def __init__(self):改为：def __init__(self, *args, **kwargs):最后不要忘了重新部署一...
How to implement an STL-style iterator and avoid common pitfalls?
... made a collection for which I want to provide an STL-style, random-access iterator. I was searching around for an example implementation of an iterator but I didn't find any. I know about the need for const overloads of [] and * operators. What are the requirements for an iterator to be "STL-st...