Can the lodash zip function work with an array of arrays?

Question

The lodash zip() function normally accepts two or more arrays as arguments. Can it accept an array of arrays?

For example, given an object like var aa = [[1,2,3],[4,5,6]]; and a desired output of [[1,4],[2,5],[3,6]] zip() must be called like _.zip(aa[0],aa[1]). For an array of arrays with more than two elements, typing the indexes into the function call becomes repetitive.

Calling _.zip(aa) doesn't work. It just nests the original array of arrays.

Sean Vieira · Accepted Answer · 2016-06-30 01:55:32Z

12

You can splat your array of arrays using apply or the ES2015 spread operator (...):

// call zip with a `this` context of the lodash object
// and with each entry in aa as a separate argument
// e. g. zip(aa[0], aa[1], ..., aa[N]);
_.zip.apply(_, aa);

// Same call, but using ES2015
_.zip(...aa)

answered Jun 30, 2016 at 1:55

Sean Vieira

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Martin Burch Over a year ago

This is an important note about the right context to pass. It might sometimes work to pass null but the lodash object is the obviously right choice.

Dylon · Accepted Answer · 2016-06-30 01:55:36Z

3

Sure, try this:

_.zip.apply(_, aa)

answered Jun 30, 2016 at 1:55

Dylon

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