Conditional Types
Conditional types help in expressing types in relation to other types, particularly in generic types. It has the syntax T extends U ? X : Y.
type TypeName<T> =
T extends string ? "string" :
T extends number ? "number" :
T extends boolean ? "boolean" :
"object";
Exercise
Define a type function IsString<T> that checks if a given type is string. If it is, it should return "Yes", otherwise "No".
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