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Difference between single and double square brackets in Bash
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I'd add that if your script doesn't start with a shebang that explicitly requests a shell that supports [[ ]] (e.g. bash with #!/bin/bash or #!/usr/bin/env bash), you should use the portable option. Scripts that assume /bin/sh supports extensions like t...
Collections.emptyMap() vs new HashMap()
...e an API where clients are expected to modify the collection, then yes, it does not make sense to return an immutable collection. But if you have an API where you return a collection that clients must not modify and should just iterate on, then returning a view to the underlying collection makes per...
Reference: mod_rewrite, URL rewriting and “pretty links” explained
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To understand what mod_rewrite does you first need to understand how a web server works. A web server responds to HTTP requests. An HTTP request at its most basic level looks like this:
GET /foo/bar.html HTTP/1.1
This is the simple request of a browser ...
Assigning default values to shell variables with a single command in bash
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It turns out THIS DOES NOT ALWAYS WORK FOR BASH-BUILTIN VARIABLES. It's very very weird. Currently those known to me are HISTTIMEFORMAT
– Otheus
Apr 13 '16 at 10:20
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Get an object's class name at runtime
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Unfortunately MyClass.name is an ES6 feature hence it does not work in IE11.
– begie
May 9 '16 at 15:30
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What is the difference between ArrayList.clear() and ArrayList.removeAll()?
...;
}
}
return modified;
}
clear() is much faster since it doesn't have to deal with all those extra method calls.
And as Atrey points out, c.contains(..) increases the time complexity of removeAll to O(n2) as opposed to clear's O(n).
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Getting scroll bar width using JavaScript [duplicate]
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// offsetWidth includes width of scroll bar and clientWidth doesn't. As rule, it equals 14-18px. so:
var scrollBarWidth = element.offsetWidth - element.clientWidth;
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Is it safe to push_back an element from the same vector?
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vector::insert(iter, value) is required to work because the standard
doesn't give permission for it not to work.
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Why does the default parameterless constructor go away when you create one with parameters
...dd a constructor in this scenario - the rest of the answer explains why it doesn't (for the languages specified in the question)
– JohnL
Aug 3 '12 at 17:51
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