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Generate a random alphanumeric string in Cocoa
...stringWithCapacity:20];
for (NSUInteger i = 0U; i < 20; i++) {
u_int32_t r = arc4random() % [alphabet length];
unichar c = [alphabet characterAtIndex:r];
[s appendFormat:@"%C", c];
}
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Reverse / invert a dictionary mapping
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For Python 2.7.x
inv_map = {v: k for k, v in my_map.iteritems()}
For Python 3+:
inv_map = {v: k for k, v in my_map.items()}
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Why don't Java Generics support primitive types?
...all ...
– Stephen C
Mar 26 '12 at 1:32
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Why can't the Java compiler also box the primitive type...
convert ArrayList to JSONArray
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PurushothamPurushotham
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Dynamic array in C#
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John Saunders
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answered Feb 27 '09 at 13:59
Chris Van Opstal...
Check whether an array is empty [duplicate]
...rray is empty. As a quick workaround you can do following:
$errors = array_filter($errors);
if (!empty($errors)) {
}
array_filter() function's default behavior will remove all values from array which are equal to null, 0, '' or false.
Otherwise in your particular case empty() construct will alw...
Querying DynamoDB by date
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Another option: stackoverflow.com/questions/35963243/…
– Ryan Shillington
May 5 '17 at 16:32
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How to use the CancellationToken property?
... Eliahu Aaron
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answered Feb 25 '13 at 13:20
SashaSasha
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Difference of keywords 'typename' and 'class' in templates?
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Hedede
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answered Jan 7 '10 at 22:30
Aaron KlotzAaron Klotz
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Java: convert List to a String
... edited Oct 9 '14 at 7:07
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answered Mar 22 '14 at 12:25
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