Help with Arrays/Objects Topic is solved

[L40P]

Hi,
for my latest project I need to learn stuff about Arrays/Objects, but there are some things I just don't understand.

1.

Code: Select all

Arr := {Number1: 1, Number2: 2, Number3: 3}
MsgBox % Arr.Count()

Why doesn't this say "3" like it even says in the Doc, but instead nothing?

2. How do I add a new key-value pair or edit the value when the key already exists? Is there a function already doing that or do I have to check using for example if-statements?

[wolf_II]

Try this:

Code: Select all

Arr := {Number1: 1, Number2: 2, Number3: 3}
MsgBox % Arr.Count() ; 3

Arr["Number4"] := 4
MsgBox % Arr.Count() ; 4

Arr.Number2 := "b"
MsgBox % Arr.Number2 ; b

I hope that helps.

[gregster]

Why doesn't this say "3" like it even says in the Doc, but instead nothing?

Well, it actually says 3... here. But the docs say that you need an AHK version 1.1.29+... so it gotta be quite new. I wasn't even really aware that it was added recently.

By default, any existing key will be overwritten, if you assign something (new) to it. But you can check for existing keys with Haskey():

Code: Select all

Arr := {Number1: 1, Number2: 2, Number3: 3}
Arr.Number1 := 4

for key, val in Arr
	msgbox % key " : " val

if arr.Haskey("Number2")
	msgbox stop. Number2 already exists
else
	Arr.Number2 := 5

if arr.Haskey("Number4")
	msgbox stop. Number 4 already exists
else
	Arr.Number4 := 5

for key, val in Arr
	msgbox % key " : " val

Not existing keys will be created, when you assign a value to a key.

[L40P]

Thanks! Wasn't aware of the newest updates. They should make a newsletter to let people know.

[gregster]

Yeah, perhaps. I look at the change log from time to time... https://autohotkey.com/docs/AHKL_ChangeLog.htm

[lexikos]

New versions are announced in the announcement sub-forum. The current version is shown at the top of every page of this forum, next to "Download" (least if you're using the default forum theme and not on a mobile). You can also write a script to check version.txt periodically...

I am not a fan of sending or receiving "newsletters".