How to add key value pair to all objects in an array with lodash

Question

I'm looping through an array of objects, each of which has a nested array of objects:

_each(this.props.chartProps.data, function(item){
    //item.values is an array of objects
    });

I want to add the same key value pair to all of the objects within the nested array. In other words, all of the objects in item.values should have a new key value pair added, call it newpair.

I'd like to clone it.

Is there a quick lodashian way to do this?

In vanilla: item.values = item.values.map(value => { value.foo = bar; return value; }) ? — gcampbell
– gcampbell, Commented Aug 10, 2016 at 13:50
Then just use forEach instead? item.values.forEach( o => o[key] = "value"); — adeneo
– adeneo, Commented Aug 10, 2016 at 13:53

Union find · Accepted Answer · 2022-02-21 16:53:44Z

4

I used a straightforward map array prototype method:

item.values = item.values.map(value => { value.foo = bar; return value; });

edited Feb 21, 2022 at 16:53

answered Aug 11, 2016 at 3:48

Union find

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2 Comments

Christian Vincenzo Traina Over a year ago

In this way you are mutating the array, not clear if it's what OP wanted

Christian Vincenzo Traina Over a year ago

Probably you can do value => ({foo: bar, ...value})

vbuhlev · Accepted Answer · 2016-08-10 13:55:57Z

1

Something like this ?

function modify(o) { /* set prop here */}

var objects = _.flatMap(array, function(o) { return o.values; });
_.forEach(objects, modify);

answered Aug 10, 2016 at 13:55

vbuhlev

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