Merge two array as key value pair

When we have two separate array and we want to make key value pair from that two array, we can use array's reduce function like below:

var columns = ["Date", "Number", "Size", "Location", "Age"]; var rows = ["2001", "5", "Big", "Sydney", "25"];
var result = rows.reduce(function(result, field, index) {
  result[columns[index]] = field;
  return result; }, {})
console.log(result);

Output:

{
  Date: "2001",
  Number: "5",
  Size: "Big",
  Location: "Sydney",
  Age: "25"
}