Uncaught Typeerror: cannot set properties of undefined (setting '1')

Asked Aug 07 '23 at 02:14

Active Aug 10 '23 at 14:26

Viewed 17 times

I am currently making an incremental game and I am making achievements. When the earn function tries to set the value of the awarded list in the achievement object from false to true, I get this error:

Cannot set properties of undefined (setting '1')

The awarded list is clearly defined as I mentioned before, so why does it say undefined?

An addon error is when I click the object that gives score, the score stays at 0, and there is no error when I click.

here is code if it helps:

awarded: [false, false],
    earn: function(index) {
        this.awarded[index] = true; //the error comes from this line
        display.updateAchievements();
    }

please tell me if you need to see any more code.

edited Aug 10 '23 at 14:26

asked Aug 07 '23 at 02:14

Harry Dong

I need more context, your type definition – Black Plum Aug 07 '23 at 02:16
@tomoe what do you mean by type definition? – Harry Dong Aug 07 '23 at 02:18
yep, and your code is a object ? – Black Plum Aug 07 '23 at 02:20
yes, it is an object. Do you need to see the entire object? – Harry Dong Aug 07 '23 at 02:21
I try it, but it works ```const op = { awarded: [false, false], earn(index: number) { this.awarded[index] = true display.updateAchievements(); },``` } – Black Plum Aug 07 '23 at 02:22
Depending on how you are calling `earn`, `this` may mean different things. I think, What @tomoe meant is provide how you declared your object and how you are using it. – Orifjon Aug 07 '23 at 02:22
yes @Orifjon it's right – Black Plum Aug 07 '23 at 02:24
I am using { this } as referring to the whole object. – Harry Dong Aug 07 '23 at 02:27
well, here is a link, https://www.typescriptlang.org/play?#code/FDDGHsDsGcBcAIAmBLaAHANgQwJ7wLzwDew8Z8ArmolrAKYCCoAFsnQG50C2dks0ACgCUxAL7BxICDATg0BYqXhYA7lgBOiOogBc8ANoAzLBmh0ANPGOm6AXXNK6GyAOSQtADz2QKXAEZ06iIk5PCwrNAAdKoaWoj6bp62CrDqFHRKZCjo2DiRVDT0TKwc3Lz8wgDcSqIOkgD09fDICCrg6gDW0ACEwHKRTuouAIxCQA – Black Plum Aug 07 '23 at 02:30
1

You try to delete the arrow function – Black Plum Aug 07 '23 at 02:31

Uncaught Typeerror: cannot set properties of undefined (setting '1')

0 Answers0