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How can you sort an array without mutating the original array?
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the spread-syntax as array literal (copied from mdn):
var arr = [1, 2, 3];
var arr2 = [...arr]; // like arr.slice()
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Spread_operator
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Python Pandas merge only certain columns
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answered Jul 31 '13 at 18:46
Andy HaydenAndy Hayden
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How to tell where a header file is included from?
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Viet
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answered Apr 29 '11 at 17:02
SodvedSodved
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How does git compute file hashes?
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Git prefixes the object with "blob ", followed by the length (as a
human-readable integer),...
What is the HEAD in git?
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edited Nov 30 '16 at 12:30
Maroun
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Catching all javascript unhandled exceptions
... done on the client side, without using any server side code. I'm using MVC3 as an environment.
4 Answers
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How to swap keys and values in a hash
... (in essence, by letting you access keys through values):
{a: 1, b: 2, c: 3}.key(1)
=> :a
If you want to keep the inverted hash, then Hash#invert should work for most situations:
{a: 1, b: 2, c: 3}.invert
=> {1=>:a, 2=>:b, 3=>:c}
BUT...
If you have duplicate values, invert will...
Python argparse ignore unrecognised arguments
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3 Answers
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To find whether a column exists in data frame or not
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answered Apr 23 '12 at 7:03
user554546user554546
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