CODEWITHSUNDEEP
javascriptarraysloopsobject
Marcello Fabrizio
Marcello Fabrizio

Reputation: 337

Looping through arrays inside an object

In JavaScript, it is possible to loop through an object using the Object.keys method. With this, I can loop the person Object as:

  let person: {

    name:     "John",
    lastName: "Doe",
    age:       31,

  }

  for (let key of Object.keys(person)) {
     console.log(person[key])
  }

Now, how is it possible to do this if the person has arrays as properties? 

 person: {

    name:     "John",
    lastName: "Doe",
    age:       31,    

    address: [{
     street:    "A Street Name",
     number:    190,
     apartment: 13
    }]

  }

Upvotes: 1

Views: 93

Answers (2)

StepUp
StepUp

Reputation: 38209

Try to use Object.entries:

Object.entries(object).forEach(([k, v]) => {
    if (Array.isArray(v)) {
        let keys = Object.keys(...v);
        console.log(keys)
    }
});

An example:

let object = {
    array: [
        {
     prop1: 1,
     prop2: 2,
     prop3: 3
    }]
  }

Object.entries(object).forEach(([k, v]) => {
    if (Array.isArray(v)) {
        let keys = Object.keys(...v);
        console.log(keys)
    }
});

Upvotes: 0

junvar
junvar

Reputation: 11604

It's not very clear what your're trying to accomplish, but going off your example, you can iterate prop1, prop2, prop3 values:

let object = {
  array: [{
    prop1: 1,
    prop2: 2,
    prop3: 3
  }]
};

for (key in object.array[0])
  console.log(key, object.array[0][key]);

Upvotes: 2

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