algerian-mobile-phone-number.js

const setNumber = function setNumber(number) {
	if (typeof number !== 'string') {
		throw new Error('Mobile phone number must be of string value');
	}

	const normalized = number.replace(/\s|-/g, '');

	if (/^(00213|\+213|0)(5|6|7)[0-9]{8}/.test(normalized) === false) {
		throw new Error('Invalid phone number');
	}

	this.number = normalized;
}

class AlgerianMobilePhoneNumber {
	constructor(number) {
		setNumber.call(this,number);
	}

	asString() {
		return this.number;
	}

	toString() {
		return this.asString();
	}

	valueOf() {
		return this.asString();
	}

	withNumber(number) {
		return algerianMobilePhoneNumberFromString(number);
	}

	equals(other) {
		const thisType = Object.prototype.toString.call(this);
		const otherType = Object.prototype.toString.call(other);
		
		if (thisType === otherType) {
			return this.number === other.number;
		}
		return false;
	}

	get [Symbol.toStringTag]() {
		return 'AlgerianMobilePhoneNumber';
	}
}

module.exports = algerianMobilePhoneNumberFromString = (number) => {
	const instance = new AlgerianMobilePhoneNumber(number);
	return new Proxy(instance, {
		get(target, prop, receiver) {
			if (typeof prop === 'function') {
				return instance[prop].bind(target);
			}
			return Reflect.get(target, prop);
		},
		set() {
			throw new Error('Can not set properties on immutable object');
		},
		defineProperty() {
			throw new Error('Can not define new properties on immutable object');
		},
		deleteProperty() {
			throw new Error('Can not delete property on immutable object');
		}
	});
};