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Easiest way to check for an index or a key in an array?
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To check if the element is set (applies to both indexed and associative array)
[ ${array[key]+abc} ] && echo "exists"
Basically what ${array[key]+abc} does is
if array[key] is set, return abc
if array[key] is not set, return nothing
References:
See Parameter Expa...
Numeric for loop in Django templates
... a simple technique that works nicely for small cases with no special tags and no additional context. Sometimes this comes in handy
{% for i in '0123456789'|make_list %}
{{ forloop.counter }}
{% endfor %}
share
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“elseif” syntax in JavaScript
... people ask questions like this.. I think it shows a fundamental misunderstanding. With if and else there really is no need of elseif.
– mpen
Oct 23 '10 at 21:12
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How to check what version of jQuery is loaded?
...'t know how to check it. If they have it loaded how do I check the version and the prefix such as:
11 Answers
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How to redirect to previous page in Ruby On Rails?
I have a page that lists all of the projects that has sortable headers and pagination.
7 Answers
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Elements order in a “for (… in …)” loop
...doesn't do it in order?
The object I wish to use will be declared once and will never be modified.
9 Answers
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GitHub relative link in Markdown file
...nk from within a Markdown file, to another file within the same repository and branch (aka a link relative to the current branch)?
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Can I change the fill color of an svg path with CSS?
...rnal CSS appears to override the path's fill attribute, at least in WebKit and Gecko-based browsers I tested. Of course, if you write, say, <path style="fill: green"> then that will override external CSS as well.
shar...
How to find indices of all occurrences of one string in another in JavaScript?
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new RegExp(searchStr) would be the way, and yes, in the general case you would have to escape special characters. It's not really worth doing unless you need that level of generality.
– Tim Down
Aug 4 '10 at 23:43
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How can I configure Logback to log different levels for a logger to different destinations?
... things with Logback filters. The below configuration will only print warn and error messages to stderr, and everything else to stdout.
logback.xml
<appender name="stdout" class="ch.qos.logback.core.ConsoleAppender">
<target>System.out</target>
<filter class="com.foo.StdOu...