How to convert an array of dictionaries to an array of arrays?

Question

How can I easily convert this (array of dictionaries):

[ { a: 1,
    b: 1,
    c: 'something',
    d: 1 },
  { a: 23443,
    b: 2111,
    c: 'something 2',
    d: 1456 }
]

to this (array of arrays):

[ [ 1,
    1,
    'something',
    1 ],
  [ 23443,
    2111,
    'something2',
    1456 ]
]

Jed Fox · Accepted Answer · 2017-12-17 13:06:08Z

3

Use Array.prototype.map and for-in loop

The map() method creates a new array with the results of calling a provided function on every element in this array

The for...in statement iterates over the enumerable properties of an object

Try this:

var input = [{
  a: 1,
  b: 1,
  c: 'something',
  d: 1
}, {
  a: 23443,
  b: 2111,
  c: 'something2',
  d: 1456
}];
var op = input.map(function(inp) {
  var arr = [];
  for (var i in inp) {
    arr.push(inp[i]);
  }
  return arr;
});
console.log(op);

OR use Object.keys(YOUR_OBJECT):

var input = [{
  a: 1,
  b: 1,
  c: 'something',
  d: 1
}, {
  a: 23443,
  b: 2111,
  c: 'something2',
  d: 1456
}];
var op = input.map(function(inp) {
  return Object.keys(inp).map(function(key) {
    return inp[key];
  })
});
console.log(op);

edited Dec 17, 2017 at 13:06

Jed Fox

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answered Mar 5, 2016 at 4:09

Rayon

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