While I understand lambdas and function types, I am unsure about the following expression:
displayFunc: (string) => string = x => x;
I find the two symbols "=>" puzzling. Can someone explain what this means?
While I understand lambdas and function types, I am unsure about the following expression:
displayFunc: (string) => string = x => x;
I find the two symbols "=>" puzzling. Can someone explain what this means?
One represents the type while the other represents the implementation.
type MyFunctionType = (string) => string
const displayFunc: MyFunctionType = x => x;
/// OR
const displayFunc: MyFunctionType = function(x: string): string {
return x;
};
(string) => string defines a function type that takes a string and returns a string;
x => x is an identity function, which means it returns the same value it receives as input.
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