Question

How to declare a function argument that can accept any type in JavaScript

Answer 1

function AcceptAnyType(x) {
    console.log(`The type of x is: ${typeof x}`);
}

AcceptAnyType(384);      
AcceptAnyType("ABCD");   
AcceptAnyType(3.14);   
AcceptAnyType([1, 2, 3]); 
AcceptAnyType(new Date());
AcceptAnyType({});



/*
run:

The type of x is: number
The type of x is: string
The type of x is: number
The type of x is: object
The type of x is: object
The type of x is: object

*/

 

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Answer 2

function AcceptAnyType(x) {
    if (typeof x === "string") {
        console.log("x is a string");
    } else if (typeof x === "number") {
        console.log("x is a number");
    } else if (Array.isArray(x)) {
        console.log("x is an array");
    } else {
        console.log("x is of another type");
    }
}

AcceptAnyType(384);      
AcceptAnyType("ABCD");   
AcceptAnyType(3.14);   
AcceptAnyType([1, 2, 3]); 
AcceptAnyType(new Date());
AcceptAnyType({});



/*
run:

x is a number
x is a string
x is a number
x is an array
x is of another type
x is of another type

*/

 

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Answer 3

function AcceptAnyType(x) {
    if (x instanceof Date) {
        console.log("x is a Date object");
    } else if (x instanceof Array) {
        console.log("x is an Array");
    } else if (x instanceof Object) {
        console.log("x is an Object");
    } else {
        console.log("x is not an object");
    }
}

AcceptAnyType(384);      
AcceptAnyType("ABCD");   
AcceptAnyType(3.14);   
AcceptAnyType([1, 2, 3]); 
AcceptAnyType(new Date());
AcceptAnyType({});



/*
run:

x is not an object
x is not an object
x is not an object
x is an Array
x is a Date object
x is an Object

*/

 

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