ecmascript 6 - ES6: Merge two arrays into an array of objects

Question

I have two arrays that I want to merge together to one array of objects...

The first array is of dates (strings):

let metrodates = [
 "2008-01",
 "2008-02",
 "2008-03",..ect
];

The second array is of numbers:

let figures = [
 0,
 0.555,
 0.293,..ect
]

I want to merge them to make an object like this (so the array items match up by their similar index):

let metrodata = [
   {data: 0, date: "2008-01"},
   {data: 0.555, date: "2008-02"},
   {data: 0.293, date: "2008-03"},..ect
];

So far I do this like so: I create an empty array and then loop through one of the first two arrays to get the index number (the first two arrays are the same length)... But is there an easier way (in ES6)?

  let metrodata = [];

  for(let index in metrodates){
     metrodata.push({data: figures[index], date: metrodates[index]});
  }

Answer 1

The easiest way is probably to use map and the index provided to the callback

let metrodates = [
  "2008-01",
  "2008-02",
  "2008-03"
];

let figures = [
  0,
  0.555,
  0.293
];

let output = metrodates.map((date,i) => ({date, data: figures[i]}));

console.log(output);