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unzip

unzip<T>(items: Array<Array<T>>): Array<Array<T>>

Performs the opposite of zip. It takes an array of arrays as input.

The function groups the values of the input sub-arrays by matching indices, and it outputs new sub-arrays with the values of those matching indices. No sub-arrays are produced for unmatching indices. For example, if one input sub-array contains four elements (indices 0-3) and another only contains three (indices 0-2), the function will not produce a sub-array for the value at index 3.

Parameters

Name Description

items

The input array of arrays.

Example

This example unzips an array of arrays. It outputs the first index of each sub-array into one array [ 0, 1, 2, 3 ], and the second index of each into another [ "a", "b", "c", "d" ].

Source

%dw 2.0
output application/json
---
unzip([ [0,"a"], [1,"b"], [2,"c"],[ 3,"d"] ])

Output

[ [ 0, 1, 2, 3 ], [ "a", "b", "c", "d" ] ]

Example

This example unzips an array of arrays. Notice that the number of elements in the input arrays is not all the same. The function creates only as many full sub-arrays as it can, in this case, just one.

Source

%dw 2.0
output application/json
---
unzip([ [0,"a"], [1,"a","foo"], [2], [3,"a"] ])

Output

[0,1,2,3]