Advice for directing further learning

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•

user101594
I've stumbled across a problem that I can't get my head around and am not sure what to search for to learn how to resolve it. Can anyone help name a technique or method which I can read up on?

I'm trying to access a propety of an object which changes depending on the output of a function. This is a simplified example:
```
var days = {
  Monday: {hour: 6, minute: 30},
  Tuesday: {hour: 7, minute: 0},
};

var today = function() {
  return "Tuesday" // simplified for this example - not sure if return is best approach
};

console.log(days[today].hour);
```
Espruino says:
```
Uncaught Error: Cannot read property 'hour' of undefined
 at line 1 col 24
console.log(days[today].hour);
                       ^
```
Do I need to get today to return a string instead? Any help would be much appreciated.

This is a situation where I don't know enough to help myself :)

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Robin in reply to @user101594

Mon 2020.02.03

@user101594

'not sure what to search for to learn how to resolve it'

to learn
Asking here was a good choice to start the learning process
Asking there will be the choice to resolve

W3Schools has always been a good place to start:

Google: array javascript site:w3schools.com

https://www.w3schools.com/js/js_arrays.asp

Array String Indexers

http://www.java2s.com/Tutorial/JavaScript/0220__Array/Usestringasthearrayindexer.htm

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user101594 in reply to @Robin
I restructured my data in "days" a few times and lost understanding of what I was dealing with. I thought that it was an object as I couldn't reference its contents with an index e.g
```
console.log(days[2].hour);
```
Firefox console says:
```
TypeError: days[2] is undefined
```
If it's an array after all, then I'll do some more reading about arrays. Thanks

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