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(![]+[])[+[]]… Explain why this works
..., for example.
![]; // false, it was truthy
!{}; // false, it was truthy
!0; // true, it was falsey
!NaN; // true, it was falsey
After it, we have the second operand of the addition, an empty Array, [], this is made just to convert the false value to String, because the string representation of...
Reference list item by index within Django template?
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190
It looks like {{ data.0 }}. See Variables and lookups.
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Opacity of background-color, but not the text [duplicate]
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601
Use rgba!
.alpha60 {
/* Fallback for web browsers that don't support RGBa */
backgroun...
防挂马：apache禁止访问文件或目录执行权限、禁止运行脚本PHP文件的设置方...
...权限的目录路径，例如：D:/piaoyun.cc/upload">
ErrorDocument 404 /404/404.html
ErrorDocument 403 /404/403.html
<FilesMatch "\.(?i:php|php3|php4)$"> // ?是尽可能多的匹配.php的字符串,i是不区分大小写,然后冒号后面跟上正则表达式，也可以写成：<FilesMat...
Preventing scroll bars from being hidden for MacOS trackpad users in WebKit/Blink
WebKit/Blink's (Safari/Chrome) default behaviour on MacOS since 10.7 (Mac OS X Lion) is to hide scroll bars from trackpad users when they're not in use. This can be confusing ; the scroll bar is often the only visual cue that an element is scrollable.
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The order of keys in dictionaries
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80
You could use OrderedDict (requires Python 2.7) or higher.
Also, note that OrderedDict({'a': 1,...
Get column index from column name in python pandas
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answered Oct 23 '12 at 0:06
DSMDSM
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mysql :: insert into table, data from another table?
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406
INSERT INTO action_2_members (campaign_id, mobile, vote, vote_date)
SELECT campaign_id, from_...
How to find the JVM version from a program?
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10 Answers
10
Active
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How to add new item to hash
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307
Create the hash:
hash = {:item1 => 1}
Add a new item to it:
hash[:item2] = 2
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