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Store a closure as a variable in Swift
...nce.
But what you probably want is that the completion handler is initialized to nil
in the same way that an Objective-C instance variable is inititialized to nil. In Swift
this can be realized with an optional:
var completionHandler: ((Float)->Void)?
Now the property is automatically initial...
How do you tell if a string contains another string in POSIX sh?
...substring parameter expansion, so it works in Bash, Dash, KornShell (ksh), Z shell (zsh), etc.
test "${string#*$word}" != "$string" && echo "$word found in $string"
A functionalized version with some examples:
# contains(string, substring)
#
# Returns 0 if the specified string contains t...
How to specify more spaces for the delimiter using cut?
...lar expressions:
ps axu | awk '/[j]boss/ {print $5}'
But if, for some bizarre reason, you really can't use awk, there are other simpler things you can do, like collapse all whitespace to a single space first:
ps axu | grep '[j]boss' | sed 's/\s\s*/ /g' | cut -d' ' -f5
That grep trick, by the...
Definitive way to trigger keypress events with jQuery
...
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answered May 6 '09 at 22:31
Nadia AlramliNadia Alramli
94.1k3131 gol...
How to duplicate a whole line in Vim?
... iono
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answered Sep 16 '08 at 15:06
Mark BiekMark Biek
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How to disable/enable select field using jQuery?
...ike to use code like this:
<form>
<input type="checkbox" id="pizza" name="pizza" value="yes">
<label for="pizza">I would like to order a</label>
<select id="pizza_kind" name="pizza_kind">
<option>(choose one)</option>
<option value="margari...
How to draw circle in html page?
...: 50px;
height: 50px;
-webkit-border-radius: 25px;
-moz-border-radius: 25px;
border-radius: 25px;
background: red;
}
<div id="circle"></div>
share
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How to run a Python script in the background even after I logout SSH?
...e
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16
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Find provisioning profile in Xcode 5
...
extempl
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answered Oct 2 '13 at 12:53
matzinomatzino
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Using DISTINCT and COUNT together in a MySQL Query
...David
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...