I am attempting to make my function flexible by allowing it to accept either a string or a custom type
onPress: (value: string | CustomType)=>void
But when I try to assign a string or CustomType, the compiler gives an error saying
is not assignable to type '(value: string | CustomType ) => void'Is there a solution to this issue?
It appears that there is a misunderstanding regarding the data type of your variable onPress. It is not simply a string | CustomType, but rather a function of type
(value: string | CustomType) => voidstring or CustomType, and does not return any value.
You have the option to assign an existing function to the onPress variable:
type CustomType = number // used for testing
let onPress: (value: string | CustomType) => void
function doSomething(value: string | CustomType) {
console.log("Performing action with value " + value)
}
onPress = doSomething
onPress("BY432")
Alternatively, you can assign an anonymous function to it:
type CustomType = number // used for testing
let onPress: (value: string | CustomType) => void
onPress = function (value) {
console.log("Performing action with value " + value)
}
onPress("BY432")
Another option is to assign an arrow function (also anonymous):
type CustomType = number // used for testing
let onPress: (value: string | CustomType) => void
onPress = value => console.log("Performing action with value " + value)
onPress("BY432")
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