I am attempting to update the following code:
this.selectedArray1.indexOf(someIndexObject);
Here is the code I want to use as a replacement:
var someVariable = "selectedArray1"
this[someVariable].indexOf(someIndexObject);
However, when I make the replacement, I encounter a compile error:
TS2538: Type 'String' cannot be used as an index type
Is it possible to achieve this in TypeScript?
When working with Typescript, the default behavior is to prevent certain actions unless it can verify that the string is a key of the type or the type includes an index signature.
For example, when using a known key:
class Foo {
selectedArray1 = [];
method(){
this['selectedArray1'] // permissible since result matches field type
const s = 'selectedArray1'; // allowed
this[s] // acceptable, as result matches field type
var someVariable = "selectedArray" + 1 // not verifiable as a key
this[someVariable] // prompts error
this[someVariable as keyof this] // assertion needed for acceptance, resulting in union of all field types of 'this'
}
}
Alternatively, utilizing an index signature:
class Foo {
[s: string] : any
selectedArray1 = [];
method(){
var someVariable = "selectedArray" + 1 // not verifiable as a key
this[someVariable] // permissible, as any type is valid
}
}
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