ReasonJun

The void type is used to represent functions that do not return a value. This is typically used for functions that have side effects, such as logging or printing to the console. For example: function logMessage(message: string): void { console.log(message); } const result = logMessage("Hello, world!"); // The result of this function is void The never type is used to represent functions that neve..

/// Any // All types are possible. However, in this case, there is no reason to use typescript, so it is rarely used. let hello3: any = 'Hello world' hello3 = 123 hello3 = false hello3 = null hello3 = {} hello3 = [] hello3= function () {} /// Unknown const z: any = 123 const u: unknown = 123 // When z is changed to u, all errors occur except for 'any'. // In other words, it is better to use 'unk..