Why does NodeJS/Javascript insist these variables are undefined?

Question

I've been grappling with this issue for about an hour now, here is the offending code:

const t = games[0];
for (const mvar in t) {
    if (t.hasOwnProperty(mvar))
        console.log(`${mvar}: ${t.mvar}`);
}

The output is:

appid: undefined
name: undefined
playtime_forever: undefined
img_icon_url: undefined
img_logo_url: undefined
has_community_visible_stats: undefined

However, the WebStorm debugger says this value is not undefined as such:

Are there any other reasons that this could be?

See the linked question and answers. You're looking for: ``console.log(`${mvar}: ${t[mvar]}`);`` (note the `[` and `]`). — T.J. Crowder, Apr 15 '18 at 16:32

score 7 · Accepted Answer · answered Apr 15 '18 at 16:30

7

t has no property named myVar.

You want t[myVar] to get the property with that name.

answered Apr 15 '18 at 16:30

SLaks

Fairly obvious and common duplicate, yes? :-) – T.J. Crowder Apr 15 '18 at 16:32

1 Answers1