Advice for directing further learning

Tue 2020.02.04

'I'm trying to access a propety of an object which changes depending on the output of a function'

I get that some identifier will be returned from the results of a completed task within a function. And, . . . that value will somehow reference items in a list perhaps?

@user101594 are we attempting to work with an array, or Json Object Notation?

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

L1 in code block found in post #1 is creating a Javascript variable whose content is a JSON object.

Is the attempt to reference that JSON object 'key' by 'name' and extract it's corresponding 'value'?

. . . or, . . .

Is the thinking to access an array by it's indexer? Or an array of a two dim array elements by an indexer?

ref: snippets in post #5

I'm not at a development station with an active Espruino device connected, doing the following from memory. . . .

Debug tip should this not yet be understood

Typing dump() in Left-Hand console should reveal if declared variables are initialized.

http://www.espruino.com/Reference#l__global_dump

ref: second snipper in post #1
'Uncaught Error: Cannot read property 'hour' of undefined'

Entering the variable by name days should do the same. This might also provide a clue as to how the Espruino WebIDE sees what is declared and how it is initialized, and might clear up some mental insight.

Wed 2020.02.05

TypeError: days[2] is undefined

re: post #5

OPTION BASE ZERO   vs   OPTION BASE ONE

Referencing the element using indexer 2 when there are only two elements using Option Base Zero, will yield undefined as a result, since there is only element zero and element one.