lodash: how to zip an array of objects with values

Question

I'm looking how to zip an array of objects with values including a new key for each value using lodash. Tried with zip, zipObject and map but I don't find the key.

What I want to do is the following (avoiding to iterate manually over the arrays)

   const array = [
     {a: 3, b: 42}, 
     {c: 4}, 
     {d: 12}
   ]
   const values = ['these', 'are', 'new', 'values']

   // goal = foo(array, values) <<< HERE
   goal = [
     {a: 3, b: 42, v: 'these'}, 
     {c: 4, v: 'are'},
     {d: 12, v:'new'}
   ]

Adam Boduch · Accepted Answer · 2015-12-16 23:06:41Z

6

You can use zipWith() to provide a custom iteratee:

var newArray = _.zipWith(array, values, function(item, value) {
    return _.defaults({ v: value }, item);
});

Note that this approach doesn't mutate the original array.

answered Dec 16, 2015 at 23:06

Adam Boduch

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1 Comment

Manu Artero Over a year ago

> this approach doesn't mutate the original array :thumbsup:

boombox · Accepted Answer · 2015-12-16 10:37:16Z

4

You can use the native map function. See the below snippet.

If you want to use lodash to do this, you can just do the same thing except with _.map(array, function (item, index) {...});.

var array = [
  {a: 3, b: 42}, 
  {c: 4}, 
  {d: 12}
];
var values = ['this', 'are', 'new', 'values']
 
var goal = array.map(function (item, index) {
  item.v = values[index];
  return item;
});

document.getElementById('goal').innerHTML = JSON.stringify(goal);

<div id="goal"></div>

edited Dec 16, 2015 at 10:37

answered Dec 16, 2015 at 10:30

boombox

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