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What is the fastest or most elegant way to compute a set difference using Javascript arrays?
...don't know if this is most effective, but perhaps the shortest
A = [1, 2, 3, 4];
B = [1, 3, 4, 7];
diff = A.filter(function(x) { return B.indexOf(x) < 0 })
console.log(diff);
Updated to ES6:
A = [1, 2, 3, 4];
B = [1, 3, 4, 7];
diff = A.filter(x => !B.includes(x) );
console.log(diff);
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What is the HEAD in git?
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edited Nov 30 '16 at 12:30
Maroun
84k2323 gold badges167167 silver badges218218 bronze badges
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Show a number to two decimal places
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edited Dec 18 '13 at 7:58
answered Dec 19 '10 at 15:14
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Convert Elixir string to integer or float
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edited Jul 10 '18 at 13:06
Ronan Boiteau
7,52566 gold badges2828 silver badges4343 bronze badges
ans...
Difference between jar and war in Java
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13 Answers
13
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Compare two List objects for equality, ignoring order [duplicate]
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313
If you want them to be really equal (i.e. the same items and the same number of each item), I ...
Any way to modify Jasmine spies based on arguments?
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3 Answers
3
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How to check whether a variable is a class or not?
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348
Even better: use the inspect.isclass function.
>>> import inspect
>>> class...
How do I detect if Python is running as a 64-bit application? [duplicate]
...k with the windows registry. Depending on whether you're running python as 32-bit or 64-bit, the key value will be different. How do I detect if Python is running as a 64-bit application as opposed to a 32-bit application?
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