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What is a WeakHashMap and when to use it? [duplicate]
... that case.
– vickirk
Jun 23 '11 at 10:13
8
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Swap key with value JSON
...t spread operator (stage 3 as of writing this) that will simplify things a bit further.
const foo = { a: 1, b: 2, c: 3 };
const bar = Object.keys(foo)
.reduce((obj, key) => ({ ...obj, [foo[key]]: key }), {});
Finally, if you have Object.entries available (stage 4 as of writing), you can cl...
Getting the class name from a static method in Java
...will supersede this unofficial Reflection.getCallerClass() thing. It’s a bit complicated for his trivial operation, i.e. Optional<Class<?>> myself = StackWalker.getInstance(StackWalker.Option.RETAIN_CLASS_REFERENCE) .walk(s -> s.map(StackWalker.StackFrame::getDeclaringClass) .findFi...
How to check if all elements of a list matches a condition?
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this way is a bit more flexible than using all():
my_list = [[1, 2, 0], [1, 2, 0], [1, 2, 0]]
all_zeros = False if False in [x[2] == 0 for x in my_list] else True
any_zeros = True if True in [x[2] == 0 for x in my_list] else False
or mo...
Dynamically adding a form to a Django formset with Ajax
...m
They both make use of jQuery and are django-specific. The first seems a bit more polished and offers a download that comes w/demos which are excellent.
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CSS display: table min-height not working
...ks and min-height doesn't in Chrome 37, Safari 7 and FF 32 on mac. IE11 on Win 8.1 gives the correct behavior in both. jsfiddle.net/nuwcyvwn/1
– Stephan Muller
Sep 23 '14 at 11:54
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test a file upload using rspec - rails
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See bit.ly/OSrL7R (stack overflow question 3966263) if you are getting file does not exist errors. A different form is needed in Rails 3.2: @file = Rack::Test::UploadedFile.new(Rails.root.join('spec/fixtures/files/test.csv'), 'te...
Saving image from PHP URL
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Bit of an old thread... but don't forget file permissions for the directory you are saving into. Just wasted ten minutes forgetting the obvious.
– Squiggs.
Nov 23 '10 at 9:28
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How to import multiple .csv files at once?
... Another great point. I think when I wrote that I was being a bit too careful about protecting data.table activities from mutating the data in place (which affects performance for the next and all subsequent runs across the data). That of course doesn't make sense in this instance. Than...
How to print color in console using System.out.println?
... codes which is much more intuitive. Recently I added support for 8 and 24 bit colors ????
Choose your format, colorize it, and print it:
System.out.println(colorize("Green text on blue", GREEN_TEXT(), BLUE_BACK()));
You can also define a format once, and reuse it several times:
AnsiFormat fWarning...