Loop through object's keys, then loop through values (because they are arrays)

Question

I have this object:

const example = {
  first: [*arrays objects*],
  second: [*arrays objects*],
  third: [*arrays objects*]
}

So, the situation is this: the example has 3 keys. Each key has an array of objects. First i want to loop through the objects keys (first, second, third), then the array of them (with forEach). How can i do that?

You should check out MDN, a truly great JavaScript reference. Example: developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/… — user5466293
– user5466293, Commented May 24, 2018 at 20:10

Gerardo BLANCO · Accepted Answer · 2018-05-24 19:35:41Z

1

To loop an object you need to specify what are you looping, in this case i use the keys

 Object.keys(example).forEach()

Hope this helps :>

const example = {
  first: [{object: '1'},{object: '2'}],
  second: [{object: '3'},{object: '4'}]
}


Object.keys(example).forEach( entrie => {
  console.log(entrie)
  example[entrie].forEach(object => {
    console.log(object)
  })
})

answered May 24, 2018 at 19:35

Gerardo BLANCO

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Comments

Noah Rose Ledesma · Accepted Answer · 2018-05-24 19:33:04Z

1

Object.keys( object ) will give you the keys of an object as an array.

const example = ...
Object.keys( example ).forEach( ( key, index ) => {
    example[key]; // This is your array you wish to loop through.
});

answered May 24, 2018 at 19:33

Noah Rose Ledesma

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