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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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Moving UITabBarItem Image down?
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180
Try adjusting tabBarItem's imageInsets (for moving the icon image) and setting the controllers t...
(![]+[])[+[]]… 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...
Ruby: Merging variables in to a string
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answered Feb 16 '09 at 21:42
Mike WoodhouseMike Woodhouse
47.6k1212 gold badges8585 silver badges123123 bronze badges
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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,...
Are lists thread-safe?
...to concurrently access, the lists's data is not protected. For example:
L[0] += 1
is not guaranteed to actually increase L[0] by one if another thread does the same thing, because += is not an atomic operation. (Very, very few operations in Python are actually atomic, because most of them can cau...
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_...
Bash tool to get nth line from a file
...re NUM is the number of the line you want to print; so, for example, sed '10q;d' file to print the 10th line of file.
Explanation:
NUMq will quit immediately when the line number is NUM.
d will delete the line instead of printing it; this is inhibited on the last line because the q causes the res...
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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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...