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How can I check for an empty/undefined/null string in JavaScript?
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edited Jun 2 '18 at 0:29
user5779136
answered Sep 30 '08 at 17:20
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Why does Clojure have “keywords” in addition to “symbols”?
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answered Oct 6 '09 at 19:52
Brian CarperBrian Carper
64.9k2525 gold badges154154 silver badges164164 bronze badges
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Swift make method parameter mutable?
...passing in a pointer.
func reduceToZero(_ x: inout Int) {
while (x != 0) {
x = x-1
}
}
var a = 3
reduceToZero(&a)
print(a) // will print '0'
This can be particularly useful in recursion.
Apple's inout declaration guidelines can be found here.
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What is the purpose of AsQueryable()?
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ServyServy
190k2323 gold badges279279 silver badges394394 bronze badges
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How do I replace the *first instance* of a string in .NET?
...search, string replace)
{
int pos = text.IndexOf(search);
if (pos < 0)
{
return text;
}
return text.Substring(0, pos) + replace + text.Substring(pos + search.Length);
}
Example:
string str = "The brown brown fox jumps over the lazy dog";
str = ReplaceFirst(str, "brown", "quick")...
Double not (!!) operator in PHP
...rrays, etc.) you will get the boolean value TRUE, and for any false value (0, 0.0, NULL, empty strings or empty arrays) you will get the boolean value FALSE.
It is functionally equivalent to a cast to boolean:
return (bool)$row;
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font-style: italic vs oblique in CSS
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edited May 22 '14 at 15:10
BoltClock♦
601k141141 gold badges12611261 silver badges12641264 bronze badges
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Why JSF saves the state of UI components on server?
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201
Why does JSF need to save the state of UI components on the server side ?
Because HTTP is sta...
Could not find com.google.android.gms:play-services:3.1.59 3.2.25 4.0.30 4.1.32 4.2.40 4.2.42 4.3.23
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edited Dec 3 '15 at 1:20
CJBS
12.4k55 gold badges6868 silver badges119119 bronze badges
answered Jun ...
Bootstrap Dropdown menu is not working
...ybe try with
<script src="//ajax.googleapis.com/ajax/libs/jquery/1.11.0/jquery.min.js"></script>
<script src="//netdna.bootstrapcdn.com/bootstrap/3.1.1/js/bootstrap.min.js"></script>
<link rel="stylesheet" type="text/css" href="//netdna.bootstrapcdn.com/bootstrap/3.1.1/c...