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javascriptlodash

Filter map and return array of ids

I have this structure :

var entities = {
  1: {'name': 'Fred', 'age': 35},
  2: {'name': 'Hans', 'age': 47},
  3: {'name': 'Bert', 'age': 27}
}

I need something like :

var ids = entities.filter( p => p.age > 30);

which should return an array :

[1, 2]

Is there a convenient way to do this ? e.g. Lodash, etc ?

Solution

  • you can use the Object.keys combined with Array.prototype.filter

    var entities = {
  1: {'name': 'Fred', 'age': 35},
  2: {'name': 'Hans', 'age': 47},
  3: {'name': 'Bert', 'age': 27}
}
const result = Object.keys(entities).filter(key =>  entities[key].age > 30);
console.log(result);