Trying to construct a variable name from a string and another variable name with window[] but not working

Question

This is my code:

function test(tlm) { 
 var soundtimer = 'success';
 var type = tlm.replace('send','');
 var timer = window[type+'timer'];

 console.log(timer);
}

test('sendsound');

I should get success but I get undefined instead. Why is that?

Your variable 'soundtimer' is scoped to the test function.

k.tten
– k.tten

2022-05-26 18:05:14 +00:00
Commented May 26, 2022 at 18:05 — k.tten
– k.tten, Commented May 26, 2022 at 18:05

k.tten · Accepted Answer · 2022-05-26 18:07:01Z

1

Your 'soundtimer' variable is locally scoped to the test function. Moving it outside allows it to be globally declared on window:

var soundtimer = 'success';
function test(tlm) {
  var type = tlm.replace('send','');
  var timer = window[type+'timer'];

  console.log(timer);
}

test('sendsound');

answered May 26, 2022 at 18:07

k.tten

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1 Comment

gobler Over a year ago

its funny but this is how I have it on my actual code but it wont work regardless.

mykaf · Accepted Answer · 2022-05-26 18:08:23Z

0

You can use an object within your function.

function test(tlm) { 
  var local = {
    soundtimer:'success'
  };
 var type = tlm.replace('send','');
 var timer = local[type+'timer'];

 console.log(timer);
}

test('sendsound');

answered May 26, 2022 at 18:08

mykaf

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2 Comments

gobler Over a year ago

this is good, however I have multiple variables ending with timer so I would have to add them all to the object?

mykaf Over a year ago

Yes, you can absolutely do that.

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