Recompose JavaScript arrays: m n-dim arrays --> n x m matrix

Question

Suppose I have the following array structure (say: for a plot with 3 lines):

let series1 = [1,2,3,4]
let series2 = [2,3,4,5]
let series3 = [2,6,6,7]

But I also need the following structure (say: for a jexcel table):

let data = [ [1,2,2], [2,3,6], [3,4,6], [4,5,7] ]

What would be the shortest way to create A from B (or vice versa)?

Answer 1

One possible way to create the desired output is using .map() , .forEach() combination.

Please find my example below:

 let series1 = [1,2,3,4]; let series2 = [2,3,4,5]; let series3 = [2,6,6,7]; const arrays = ['series1', 'series2', 'series3']; const result = series1.map((c,i) => { const a = []; arrays.forEach(e => a.push(eval(e)[i])); return a; }); console.log(result);

With the provided solution the code expects all the series arrays to have the same length.

I hope that helps!