A method for increasing a counter using only an instance of a class or function without accessing its methods or properties in Javascript

Looking at the task ahead,

let increment = new Increment();

I have been tasked with creating a Javascript class or function called Increment in order to achieve the following:

console.log(`${increment}`) // should output 1

console.log(`${increment}`); // should output 2

console.log(`${increment}`); // should output 3

console.log(`${increment}`); // should output 4

The key here is that increment cannot be a function, meaning I cannot use increment(), nor can it be a property like increment.count.

Therefore, the challenge boils down to the following code snippet:


let increment = new Increment();

console.log(`${increment}`); //1

console.log(`${increment}`); //2

console.log(`${increment}`); //3

console.log(`${increment}`); //4

My goal is to craft a function named Increment that will give me the desired sequential output.

Answer №1

To create a class that includes a private field and a custom toString() method to increment and return the value of that field, you can use the following code:

class Counter{
    constructor(){
       this.count = 1;
    }
    
    toString(){
        return this.count++;
    }
}

let counter = new Counter();

console.log(`${counter}`);

console.log(`${counter}`);

console.log(`${counter}`);

console.log(`${counter}`);

You can achieve a similar result using a function as well:

function Counter(){
    let count = 1;
    return { toString: () => count++ }
}

let counter = new Counter();

console.log(`${counter}`);

console.log(`${counter}`);

console.log(`${counter}`);

console.log(`${counter}`);

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