CODEWITHSUNDEEP
javascripttypescript
Jack N
Jack N

Reputation: 175

How to parse array of multiple arrays

I am trying to change an array which contains multiple arrays into a form that I can use for an external API.

Example:

[ [44.5,43.2,45.1] , [42, 41.2, 48.1] ]

into 

[ [44.5,42], [43.2,41.2] , [45.1, 48.1] ]

Currently my code runs as this, but doesn't work

var newArr= [];
var tempArr= [];

for(var key in data){
    tempArr.push(finalArr[key][key])
    newArr.push(tempArr)
 }

Is there some easier way to accomplish this without looping? I was thinking of maybe a map function but I'm not sure how to implement it here.

Upvotes: 1

Views: 793

Answers (2)

mrDinckleman
mrDinckleman

Reputation: 98

var arr = [
  [44.5, 43.2, 45.1],
  [42, 41.2, 48.1]
];
var result = arr[0].map(function (el, index) {
  return [el, arr[1][index]];
});
console.log(result);

But you have to be sure, that source arrays have same length.

Upvotes: 1

Nina Scholz
Nina Scholz

Reputation: 386848

You could transpose the arrays by reducing and mapping the values.

This works for any length.

const transpose = array => array.reduce((r, a) => a.map((v, i) => [...(r[i] || []), v]), []);

console.log(transpose([[44.5, 43.2, 45.1], [42, 41.2, 48.1]]));
.as-console-wrapper { max-height: 100% !important; top: 0; }

Upvotes: 2

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