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How to check a not-defined variable in JavaScript
I wanted to check whether the variable is defined or not. For example, the following throws a not-defined error
14 Answer...
Update just one gem with bundler
I use bundler to manage dependencies in my rails app, and I have a gem hosted in a git repository included as followed:
8 A...
ConcurrentHashMap vs Synchronized HashMap
What is the difference between using the wrapper class, SynchronizedMap , on a HashMap and ConcurrentHashMap ?
12 Ans...
Render HTML to an image
...ld question which already has a lot of answers, yet I still spent hours trying to actually do what I wanted:
given an html file, generate a (png) image with transparent background from the command line
Using Chrome headless (version 74.0.3729.157 as of this response), it is actually easy:
"/App...
How do I obtain the frequencies of each value in an FFT?
I have an FFT result. These are stored in two double arrays: a real part array and an imaginary part array. How do I determine the frequencies that correspond to each element in these arrays?
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Regular expression for a hexadecimal number?
How do I create a regular expression that detects hexadecimal numbers in a text?
11 Answers
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Why isn't ProjectName-Prefix.pch created automatically in Xcode 6?
Why isn't ProjectName-Prefix.pch created automatically in Xcode 6 ?
8 Answers
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Code Golf - π day
Guidelines for code-golf on SO
26 Answers
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difference between variables inside and outside of __init__()
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Variable set outside __init__ belong to the class. They're shared by all instances.
Variables created inside __init__ (and all other method functions) and prefaced with self. belong to the object instance.
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How to sort Map values by key in Java?
I have a Map that has strings for both keys and values.
15 Answers
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