CODEWITHSUNDEEP
javascriptobjectlodash
benhowdle89
benhowdle89

Reputation: 37464

Don't include an object in map JavaScript

Using LoDash to map over an object:

_.map(items, (item) = > {
    if (Array.isArray(item)) {
        // don't include this in final object
    }
    return _.assign({
        foo: "bar"
    }, item);
});

Wondering what my best tactic is for not including an object in the returned, mapped, object if the current object is an array?

Upvotes: 1

Views: 225

Answers (4)

georg
georg

Reputation: 214959

Another (and IMO a cleaner) solution is to use chaining:

results = _(items).reject(_.isArray).map(function(item) {
    ....
}).value()

Upvotes: 1

Robert Moskal
Robert Moskal

Reputation: 22553

This... just assign an empty object if item is an array, otherwise assign item:

_.map(items, (item) = > {
    return _.assign({
        foo: "bar"
    }, Array.isArray(item)?{}:item);
});

Here's a little fiddle without the new anonymous function syntax: https://jsfiddle.net/xurm6vrr/1/

Upvotes: 0

Kiril
Kiril

Reputation: 2963

You may use reduce which works perfectly for your case:

var items = [{a: 1}, ["asd"], {b: 2}];

var result = _.reduce(items, (res, item) => {
    if (!Array.isArray(item)) {
        _.assign(res, item);
    }
  return res;
}, {foo: "bar"});

See jsbin.

Upvotes: 1

Halcyon
Halcyon

Reputation: 57729

I would expect a map function to always output the same keys as the input. The values maybe modified, but the keys remain the same.

There are other functions you can use to change the set of items like filter or some kind of aggregate or reduce.

Upvotes: 0

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