Javascript methods with a var in it

Question

I'm trying to get the value of an object in a object but the key value is a variable so I don't know how to have this code working:

var res = 'Hello';
var greetings = {
  'Hello': {'lang':'EN' ,'goodbye': 'Goodbye'},
  'Bonjour': {'lang':'FR', 'goodbye': 'Aurevoir'}
}

Later I want to use this :

greetings.res.lang

to get : 'EN', for now I get 'undefined' because it evaluates the expression greetings.res and not greeting.Hello so it doesn't find it in the list.

EDIT : Thanks for the quick answer guys !

@SergioTulentsev there was an error when it posted...later it edited the posted one was `var greetings = { 'Hello': {'lang':'EN' ,'goodbye': 'Goodbye'}, 'Bonjour': {'lang:'FR', 'goodbye': 'Aurevoir'} }` — Aravind S, Jun 28 '18 at 08:54
@SergioTulentsev yeah.when i checked, the JSON was not fine that's why i commented like that — Aravind S, Jun 28 '18 at 08:59

score 5 · Accepted Answer · answered Jun 28 '18 at 08:49

5

See How to create a Dictionary with Key/Value pairs

var res = 'Hello';
var greetings = {
  'Hello': {'lang':'EN' ,'goodbye': 'Goodbye'},
  'Bonjour': {'lang':'FR', 'goodbye': 'Aurevoir'}
}

console.log(greetings[res].lang);

answered Jun 28 '18 at 08:49

Hearner

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score 1 · Answer 2 · answered Jun 28 '18 at 08:49

1

This should work for you:

var res = 'Hello';
var greetings = {
  'Hello': {'lang':'EN' ,'goodbye': 'Goodbye'},
  'Bonjour': {'lang': 'FR', 'goodbye': 'Aurevoir'}
}

alert(greetings[res].lang);

answered Jun 28 '18 at 08:49

Neil T

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score 0 · Answer 3 · answered Jun 28 '18 at 08:50

0

Use [] when you have dynamic keys:

greetings[res].lang

OR

greetings[res]['lang']

answered Jun 28 '18 at 08:50

score -2 · Answer 4 · edited Jun 28 '18 at 13:31

-2

You can access it like this:

greetings[res].lang

edited Jun 28 '18 at 13:31

Martin

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answered Jun 28 '18 at 08:50

Angry Golem

1
2

Javascript methods with a var in it

4 Answers4