Lodash Javascript Return Elements Based Of Off Unique Property Values

Question

I'm trying to utilize lodash but cannot find a javascript function that will take this:

[
{item: {id: 1}, 'name': 'hi'},
{item: {id: 2}, 'name': 'hey'},
{item: {id: 1}, 'name': 'hello'}
];

and turn it into

[
{item: {id: 1}, 'name': 'hi'},
{item: {id: 2}, 'name': 'hey'}
];

So far I have in javascript this:

var mainThings = [
        {item: {id: 1}, 'name': 'hi'},
        {item: {id: 2}, 'name': 'hey'},
        {item: {id: 1}, 'name': 'hello'}
        ];

uniqueMainsFunc = function() {
    var ids = [],
        mains = [];

    _.forEach(mainThings, function(thing) {
        if (ids.indexOf(thing.item.id) === -1) {
            ids.push(thing.item.id);
            mains.push(thing);
        }
    });
    return uniqueMains;
};

In this scenario uniqueMains would only contain:

[
{item: {id: 1}, 'name': 'hi'},
{item: {id: 2}, 'name': 'hey'}
]

Is there a lodash function that can better handle this? After the .forEach I tried to use !_.some(uniqueNestedIds, thing.item.id) and it did not work.

isvforall · Accepted Answer · 2016-03-04 19:43:00Z

2

uniqBy method can solve your problem

var mainThings = [
    { item: { id: 1 }, 'name': 'hi' },
    { item: { id: 2 }, 'name': 'hey' },
    { item: { id: 1 }, 'name': 'hello' }
];


var uniq = _.uniqBy(mainThings, 'item.id')

console.log(uniq);

Result:

[ { item: { id: 1 }, name: 'hi' },
  { item: { id: 2 }, name: 'hey' } ]

answered Mar 4, 2016 at 19:43

isvforall

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Comments

crackmigg · Accepted Answer · 2016-03-04 19:43:20Z

2

You can use _.uniqBy for this:

_.uniqBy(mainThings, function(item) {
    return item.item.id;
});

See this Plnkr.

answered Mar 4, 2016 at 19:43

crackmigg

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