class Model

class Model {
    #object

    constructor(object = {}) {
        this.#object = object;

        let keys = Object.keys(this.#object),
            types = []
        for (let i in this.#object) {
            types.push(typeof this.#object[i])
        }

        return function (data) {
            if (typeof data !== 'object') throw "DATA REQUIRED A OBJECT!"
            let dataKeys = Object.keys(data)
            for (let i = 0, l = keys.length; i < keys.length; i++) {
                // Validating the keys
                if (dataKeys[i] !== keys[i]) return new Error("INVALID KEY! '" + dataKeys[i] + "'")
                // Validating data types
                if (typeof data[keys[i]] !== types[i]) return new Error("INVALID TYPE ASSIGNATION! " + keys[i] + " is not a " + types[i])
                // Setting in 'this'
                this[dataKeys[i]] = data[dataKeys[i]]
            }

            return this;
        };
    }
}

const User = new Model({
    name: String(),
    age: Number(),
    confirmed: Boolean()
})

let user = new User({name: 'Nico', age: 15, confirmed: false})

console.log(user)