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How to avoid isset() and empty()
I have several older applications that throw a lot of "xyz is undefined" and "undefined offset" messages when running on the E_NOTICE error level, because the existence of variables is not explicitly checked using isset() and consorts.
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No ConcurrentList in .Net 4.0?
I was thrilled to see the new System.Collections.Concurrent namespace in .Net 4.0, quite nice! I've seen ConcurrentDictionary , ConcurrentQueue , ConcurrentStack , ConcurrentBag and BlockingCollection .
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How do I exchange keys with values in a dictionary?
I receive a dictionary as input, and would like to to return a dictionary whose keys will be the input's values and whose value will be the corresponding input keys. Values are unique.
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What does Docker add to lxc-tools (the userspace LXC tools)?
If you take a look at Docker's features, most of them are already provided by LXC.
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How to make my custom type to work with “range-based for loops”?
Like many people these days I have been trying the different features that C++11 brings. One of my favorites is the "range-based for loops".
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Check if an array contains any element of another array in JavaScript
I have a target array ["apple","banana","orange"] , and I want to check if other arrays contain any one of the target array elements.
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How to show vertical line to wrap the line in Vim?
I'm interested in finding a way to show a vertical line at column 80 in Vim (not GVim).
5 Answers
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Conveniently map between enum and int / String
When working with variables/parameters that can only take a finite number of values, I try to always use Java's enum , as in
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How to mount a host directory in a Docker container
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Java time-based map/cache with expiring keys [closed]
Do any of you know of a Java Map or similar standard data store that automatically purges entries after a given timeout? This means aging, where the old expired entries “age-out” automatically.
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