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Why is there no logical xor in JavaScript?
...ld never use it as a logical operator on boolean because implementation is OS dependant. I was using some kind of a ^= true to toggle booleans and it fails on some machines such as phones.
– Masadow
Jun 5 '15 at 15:14
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invalid context 0x0 under iOS 7.0 and system degradation
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Others will ask you to post the code where you access a core graphics context, but I doubt that's the issue. These invalid context 0x0 error messages are common and easy to reproduce in iOS 7. In fact, I can reproduce the error using storyboard with...
Find unused npm packages in package.json
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If you're using a Unix like OS (Linux, OSX, etc) then you can use a combination of find and egrep to search for require statements containing your package name:
find . -path ./node_modules -prune -o -name "*.js" -exec egrep -ni 'name-of-package' {} \;
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How to run a shell script on a Unix console or Mac terminal?
...rences such as is the case between sh and bash).
A note on /usr/bin/env
Most commonly, you'll see hash bangs like so:
#!/bin/bash
The result is that the kernel will run the program /bin/bash to interpret the script. Unfortunately, bash is not always shipped by default, and it is not always ava...
Setting custom UITableViewCells height
... buttons and image views to be displayed. There is one label in the cell whose text is a NSString object and the length of string could be variable. Due to this, I cannot set a constant height to the cell in the UITableView 's heightForCellAtIndex method. The cell's height depends on the label'...
Fast check for NaN in NumPy
...e of NaNs than in their absence. It also seems to get slower as NaNs get closer to the start of the array. On the other hand, sum's throughput seems constant regardless of whether there are NaNs and where they're located:
In [40]: x = np.random.rand(100000)
In [41]: %timeit np.isnan(np.min(x))
100...
Is it worthwile to learn assembly language? [closed]
...thermore, the conventional wisdom is to not try to hand-optimise assembly most of the time but let the compiler worry about it. When you see some examples of the twisted things that compilers generate, you will better understand why the conventional wisdom holds.
Example: LFSRs run fast with the ro...
How to create a file with a given size in Linux?
For testing purposes I have to generate a file of a certain size (to test an upload limit).
13 Answers
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How to ignore xargs commands if stdin input is empty?
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@wedi - OSX has BSD userspace, so this sort of thing will happen frequently. You can work around it by using homebrew to install the GNU fileutils.
– edk750
Jul 20 '16 at 19:41
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How do I parse XML in Python?
...e number in the XML source, etc. that can be very useful in several scenarios.
– Saheel Godhane
Jan 21 '15 at 22:23
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