How to select object node by key using variable

Question

I have an object called assignments which contains arrays as such;

assignments = {
    'version_1': [1,2,3,4,5],
    'version_2': [6,7,8,9,0],
    'version_3': [3,4,5,6,7]
}

if I want to get the values of a particular version I can simply say something like console.log(assignments.version_2);

But what if I have an integer set in a variable? How would I reference the values dynamically. e.g.

var version_id = 2;
console.log(assignments.version_[version_id]);

Possible duplicate of How to access object using dynamic key? — JJJ
– JJJ, Commented Oct 30, 2017 at 9:08

GGO · Accepted Answer · 2017-10-30 09:21:05Z

2

You can use this :

var version_id = 2;
console.log(assignments["version_" + version_id]);

Or, if you know you only have to support browsers that have es6, you can do :

assignments[`version_${version_id}`]

Es6 template strings make things nicer

edited Oct 30, 2017 at 9:21

answered Oct 30, 2017 at 9:09

GGO

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3 Comments

BobbyP Over a year ago

Perfect. Thanks.

Nikhil Aggarwal Over a year ago

@GGO - Added a missing closing brackets - Hope it is good with you

TKoL Over a year ago

@Typhoon101 if you know you only have to support browsers that have es6, you cna do assignments[`version_${version_id}`] -- es6 template strings make things nicer

Nikhil Aggarwal · Accepted Answer · 2017-10-30 09:09:16Z

0

Try following

var assignments = {
  'version_1': [1, 2, 3, 4, 5],
  'version_2': [6, 7, 8, 9, 0],
  'version_3': [3, 4, 5, 6, 7]
};

var version_id = 2;

console.log(assignments["version_" + version_id]);

answered Oct 30, 2017 at 9:09

Nikhil Aggarwal

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Comments

vicky patel · Accepted Answer · 2017-10-30 09:47:45Z

0

assignments = {
    'version_1': [1,2,3,4,5],
    'version_2': [6,7,8,9,0],
    'version_3': [3,4,5,6,7]
}
console.log(assignments['version_2'])

answered Oct 30, 2017 at 9:47

vicky patel

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