Need to concatenate object name with counter variable properly

Question

I am working on this demo. How I can Concatenate the years.range with counter to have years.range2[0]?

let years = {
  range1: [200, 2001, 2002, 2003],
  range2: [2004, 2005, 206, 2007]
}

//$('#year').html(years.range1[0]);
let counter = 1;
$('#year').html(years.range + counter + [0]);

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div id="year"></div>

range is an array so you can index on it, try it like this years.range[counter] — user7148391
– user7148391, Commented Nov 13, 2018 at 20:30

Akrion · Accepted Answer · 2018-11-13 20:36:51Z

1

Try this to access the range2 item from the years range object:

let years = {
  range1: [200, 2001, 2002, 2003],
  range2: [2004, 2005, 206, 2007]
}

const counter = 2  // <--- gets you `years['range2']` when concatenated

$('#year').html(years[`range${counter}`][0]);

By you doing this: $('#year').html(years.range + counter + [0]);

the issue is that years.range + counter would give you the proper array index but +[0] would mess things up since you are saying add years.range1 with an array containing single element - 0.

edited Nov 13, 2018 at 20:36

answered Nov 13, 2018 at 20:28

Akrion

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Comments

Jonas Wilms · Accepted Answer · 2018-11-13 20:27:21Z

1

Dynamic property access requires [ ... ] :

 years["range" + counter][0]

But why is years not an array? That would make the while thing way easier.

 const years = [
    [200,2001,2002,2003],
[2004,2005,206,2007]
];

console.log(years[0]);

answered Nov 13, 2018 at 20:27

Jonas Wilms

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