Exclude given objects from array

Question

I have the below array. I am attempting to exclude certain objects from this array in processing.

For example. I would like to exclude the type 'dog' and only use any object that is of type duck.

I'd like to do this using underscore/lodash but will use plain JS if need be.

animals: [
  {
    type: 'duck',
    name: 'quack',
  },
  {
    type: 'duck',
    name: 'quieck',
  },
  {
    type: 'dog',
    name: 'bark',
  },
]

Answer 1

I suppose your array represents variable animals . You can use Array.prototype.filter() function. If you want all ducks:

const animals = [
    { type: 'duck', name: 'quack' },
    { type: 'duck', name: 'quieck' },
    { type: 'dog', name: 'bark' },
];
const ducks = animals.filter(o => o.type === 'duck');

or if you want to exclude all dogs:

const withoutDogs = animals.filter(o => o.type !== 'dog');

I used ES6 syntax. ES5 equivalent would be:

var ducks = animals.filter(function(o) { return o.type === 'duck' });

Answer 2

Underscore / LoDash方法只是

var result = _.where(animals, {type: 'duck'});