Object manipulation in javascript in loop

Question

var userLists = {
    user0 : {username: 'user9110252username', genrePref: 'user9110252genre'},
    user1 : {username: 'Jon', genrePref: 'rock'},
    user2 : {username: 'Lucy', genrePref: 'pop'},
    user3 : {username: 'Mike', genrePref: 'rock'},
}

I am getting input like userLists.user from somewhere it should be like userLists.user0 how can i convert this request

var i =0;
for(var key in userLists) {
   console.log(userLists.user+i)
   i++;
}

Just use console.log(userLists[key]). You don't need another i variable. Also, consider using a users array instead of using consecutive numeral keys — adiga
– adiga, Commented May 15, 2020 at 4:59
Is it possible to use foreach for iteration of javascript ?? — Sunil Dubey
– Sunil Dubey, Commented May 15, 2020 at 5:53
var i = 0; userLists.forEach((key, value) => { console.log(key); i++ }) is this possible in object iteration ? — Sunil Dubey
– Sunil Dubey, Commented May 15, 2020 at 6:13
@SunilDubey for (const [key, value] of Object.entries(userLists)) { console.log(key); } — JLRishe
– JLRishe, Commented May 15, 2020 at 9:27

Ramesh Reddy · Accepted Answer · 2020-05-15 06:23:11Z

1

If you want to use forEach or map you can do that on arrays but since you have an object you can use Object.entries for getting an array of arrays. There are also Object.keys and Object.values.

var userLists = {
    user0 : {username: 'user9110252username', genrePref: 'user9110252genre'},
    user1 : {username: 'Jon', genrePref: 'rock'},
    user2 : {username: 'Lucy', genrePref: 'pop'},
    user3 : {username: 'Mike', genrePref: 'rock'},
}

Object.entries(userLists).forEach(([key, value]) => {
  console.log(key, value);
})

answered May 15, 2020 at 6:23

Ramesh Reddy

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1 Comment

Sunil Dubey Over a year ago

hmm but Is there any way to fix this code ? var i =0; for(var key in userLists) { console.log(userLists.user+i) i++; }

Rajneesh · Accepted Answer · 2020-05-15 06:28:35Z

1

If I understand your question correctly, do you want like this ?

var userLists = {
    user0 : {username: 'user9110252username', genrePref: 'user9110252genre'},
    user1 : {username: 'Jon', genrePref: 'rock'},
    user2 : {username: 'Lucy', genrePref: 'pop'},
    user3 : {username: 'Mike', genrePref: 'rock'},
}

var result = Object.fromEntries(Object.entries(userLists).map(([k,v], i)=>[k=i, v]));

console.log(result);

Or you can do similar manipulation inside map function according to your requirement.

answered May 15, 2020 at 6:28

Rajneesh

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