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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...
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...
Do C# Timers elapse on a separate thread?
... The System.Threading.Timer class makes
callbacks on a ThreadPool thread and
does not use the event model at all.
So indeed the timer elapses on a different thread.
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Definition of a Balanced Tree
... tree for me. I have that "a tree is balanced if each sub-tree is balanced and the height of the two sub-trees differ by at most one.
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How can I clear event subscriptions in C#?
...outside the class, you can't do this - events basically expose "subscribe" and "unsubscribe" and that's it.
It's worth being aware of what field-like events are actually doing - they're creating a variable and an event at the same time. Within the class, you end up referencing the variable. From ou...
Testing modules in rspec
...ting modules in rspec? I have some modules that get included in few models and for now I simply have duplicate tests for each model (with few differences). Is there a way to DRY it up?
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How to manage startActivityForResult on Android?
...ctivity,so you can set the result as "RESULT_CANCELLED" in the catch block and return to FirstActivty and in FirstActivity's' 'onActivityResult() you can check whether you got the success or failure result.
– Nishant
Oct 31 '13 at 4:42
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Rails ActionMailer - format sender and recipient name/email address
Is there a way to specify email AND name for sender and recipient info when using ActionMailer?
6 Answers
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Concurrent.futures vs Multiprocessing in Python 3
...ures , which appear to be some advanced combination of the older threading and multiprocessing modules.
1 Answer
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Split array into chunks
...his answer):
More efficient method:
// refresh page if experimenting and you already defined Array.prototype.chunk
Object.defineProperty(Array.prototype, 'chunk', {
value: function(chunkSize) {
var R = [];
for (var i = 0; i < this.length; i += chunkSize)
R.push(this.s...