CODEWITHSUNDEEP
javascriptobjectiterationfor-in-loop
Ar2zee
Ar2zee

Reputation: 420

iterations thru objects JavaScript

Hello everybody I have a short question about iteration in objects

Here's my code [https://jsfiddle.net/Ar2zee/9g91ouq6/]

var names = {
  first: 'Sasha',
  second: 'Andrey',
  third: 'Pasha',

  lastnames: {
    firstL: 'Oga',
    secondL: 'opa',
    thirdL: 'uka'
  },
}
for (var keys in names) {
  for (var newKeys in names.lastnames) {
    console.log(names.lastnames[newKeys]);
  }
}

My goal it's to log once all of the lastNAmes oga, opa, uka, right now my results is 4 times each of the last name can you please explain why it's 4 times right now and how to make once each of them

Thank you

Upvotes: 2

Views: 47

Answers (3)

charlietfl
charlietfl

Reputation: 171698

In modern browsers or node can use Object.values() which returns an array.

var names = {
  first: 'Sasha',
  second: 'Andrey',
  third: 'Pasha',

  lastnames: {
    firstL: 'Oga',
    secondL: 'opa',
    thirdL: 'uka'
  }
}

console.log(Object.values(names.lastnames).join());

Upvotes: 0

baao
baao

Reputation: 73301

You are using two loops. The outer loop iterates all of the names object keys, which are first, second, third and lastnames. As the inner loop iterates over the names.lastnames, each of them will get logged in each iteration of the outer loop. To do what you want, simply remove the outer loop:

for( var newKeys in names.lastnames){
    console.log(names.lastnames[newKeys]);
}

If you're using this in real world code, make sure to check for hasOwnProperty when using a for in loop:

for( var newKeys in names.lastnames){
    if (names.lastnames.hasOwnProperty(newKeys)) console.log(names.lastnames[newKeys]);
}

Sidenote:

If you just want to get all the values in names.lastnames, you could also use Object.values():

var names = {
  first: 'Sasha',
  second: 'Andrey',
  third: 'Pasha',

  lastnames: {
    firstL: 'Oga',
    secondL: 'opa',
    thirdL: 'uka'
  }
};

console.log(Object.values(names.lastnames));

Upvotes: 1

Alberto Trindade Tavares
Alberto Trindade Tavares

Reputation: 10396

You just need one for loop:

var names = {
    first: 'Sasha',
    second: 'Andrey',
    third: 'Pasha',

    lastnames: {
        firstL: 'Oga',
        secondL: 'opa',
        thirdL: 'uka'
    },
}

for (var key in names.lastnames) {
    console.log(names.lastnames[key]);
}

Upvotes: 0

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