Generic functions

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// Something like the following works fine:

function foo<T>(x: T): T { return x; }

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// However using an arrow generic function will not:

const foo = <T>(x: T) => x; // ERROR : unclosed `T` tag

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// Workaround: Use extends on the generic parameter 

// to hint the compiler that it's a generic, e.g.:

const foo = <T extends unknown>(x: T) => x;

Typically a generic funtion is an instance of a class that inherit boht from function  and standard objects .Thus generic functions are both fucntions and ordinary objects