I have an array:
[ [1,2,3], [4,5,6] ]
How can I turn it into
[ [1,4], [2,5], [3,6] ]
I am sure it's something I can do easily with lodash but I have not found it in the docs.
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Jose Ricardo Bustos M.
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Sergei Basharov
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1You're looking for `_.zip()` – Pointy Apr 17 '15 at 20:20
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@Pointy, but zip() is only in python , right ? – Vitaliy Terziev Apr 17 '15 at 20:27
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2@vtz ?? No, [it's also part of Lodash.](https://lodash.com/docs#zip) – Pointy Apr 17 '15 at 20:28
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2Seen this answer: http://stackoverflow.com/a/17428779/2059482 – solarshado Apr 17 '15 at 20:31
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ah yes, never heard of it, tnx @Pointy – Vitaliy Terziev Apr 17 '15 at 20:31
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@JoseRicardoBustosM. why is that necessary? Is it generalized to higher-dimension arrays? – Pointy Apr 17 '15 at 20:32
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@Pointy you are right .... deleting comment – Jose Ricardo Bustos M. Apr 17 '15 at 20:39
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@Pointy the solution in [link](https://github.com/jlmorgan/lodash-transpose/blob/master/src/transpose.js) I do not feel bad solution – Jose Ricardo Bustos M. Apr 17 '15 at 20:44
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@JoseRicardoBustosM. I don't think it's bad either; I was just curious as to what it does that `_.zip()` doesn't do. I suppose I could just read the code :) – Pointy Apr 17 '15 at 20:47
2 Answers
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a solution using lodash
m = [ [1,2,3], [4,5,6] ];
t = _.zip.apply(_, m);
// result t = [ [1,4], [2,5], [3,6] ]
m = [ [1,1,1,1], [2,2,2,2], [3,3,3,3] ]
t = _.zip.apply(_, m);
// result t = [ [1,2,3], [1,2,3], [1,2,3], [1,2,3] ]
explanation:
apply: Make the call to a function with a given value for this and arguments passed as an array ..... is same that _.zip(arg0, arg1, arg2) similar _.zip.apply(null, m) where m = [arg0, arg1, arg2]
Jose Ricardo Bustos M.
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_.zip(['fred', 'barney'], [30, 40], [true, false]);
// → [['fred', 30, true], ['barney', 40, false]]
// Official documentation
Official documentation. https://lodash.com/docs#zip
baquiax
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OP want to use lodash library, he want not tranpose matrix algorithm – Jose Ricardo Bustos M. Apr 17 '15 at 20:35
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