contact-service/libs/service.js

A simple array based service layer for address book apps

module.exports = {};

module.exports.getAll = ()=>{
	return contacts;
};

module.exports.getById = id=>{
	if(!id){
		throw new Error("Id is required but missing");
	}
	if(isNaN(id)){
		throw new Error(`Id must be a "number", but got "${typeof id}"`);
	}
	id = parseInt(id);

	var c = contacts.filter(c=>c.id==id)[0];
	return c? c: null;
};

module.exports.addNew = (contact) => {
	if(!contact || typeof contact != "object"){
		throw new Error(`contact was not supplied or was not an object`);
	}
	var requiredFields = ["first_name", "last_name", "email", "phone", "dob", "city"];
	var missingFields = [];
	requiredFields.forEach(fld=>{
		if(!(fld in contact)){
			missingFields.push(fld);
		}
	});
	if(missingFields.length){
		throw new Error(`Missing fields - ${missingFields.join()}`);
	}
	contact.id = contacts.map(c=>c.id).sort((a, b)=>a>b?1:-1)[contacts.length-1] + 1;
	contacts.push(contact);
	return contact;
};

module.exports.update = (contact) => {
	if(!contact || typeof contact != "object"){
		throw new Error(`contact was not supplied or was not an object`);
	}
	var requiredFields = ["id", "first_name", "last_name", "email", "phone", "dob", "city"];
	var missingFields = [];
	requiredFields.forEach(fld=>{
		if(!(fld in contact)){
			missingFields.push(fld);
		}
	});
	if(missingFields.length){
		throw new Error(`Missing fields - ${missingFields.join()}`);
	}
	var index = contacts.findIndex(c=>c.id==contact.id);
	if(index==-1){
		throw new Error(`No contact for id ${contact.id}`);
	}
	contacts[index] = contact;
	return contact;
};

module.exports.delete = (id) => {
	if(!id){
		throw new Error(`id was not supplied`);
	}

	if(isNaN(id)){
		throw new Error(`Id must be a "number", but got "${typeof id}"`);
	}
	id = parseInt(id);
	var index = contacts.findIndex(c=>c.id==id);
	if(index==-1){
		throw new Error(`No contact for id ${contact.id}`);
	}
	var result = contacts.splice(index, 1);
	return result[0];
};


var contacts = [{
	"id": 3,
	"first_name": "Allen",
	"last_name": "Smith",
	"email": "allensmith@mailinator.com",
	"phone": "5556278822",
	"dob": "1989-02-12",
	"city": "Chicago"
}, {
	"id": 17,
	"first_name": "Amy",
	"last_name": "Stanley",
	"email": "astanleyg@netlog.com",
	"phone": "4689686754",
	"dob": "1972-03-10",
	"city": "Boto"
}, {
	"id": 28,
	"first_name": "Annie",
	"last_name": "Simpson",
	"email": "asimpsonr@so-net.ne.jp",
	"phone": "6861508148",
	"dob": "1999-08-15",
	"city": "Pra\u017emo"
}, {
	"id": 18,
	"first_name": "Barbara",
	"last_name": "Nichols",
	"email": "bnicholsh@virginia.edu",
	"phone": "7733856499",
	"dob": "2002-04-18",
	"city": "T\u00e2n Tru\u0323"
}, {
	"id": 13,
	"first_name": "Beverly",
	"last_name": "Shaw",
	"email": "bshawc@wikimedia.org",
	"phone": "8046272581",
	"dob": "1950-01-27",
	"city": "Minna"
}, {
	"id": 34,
	"first_name": "Carlos",
	"last_name": "Henry",
	"email": "chenryx@google.cn",
	"phone": "4853676264",
	"dob": "1941-09-08",
	"city": "Nanterre"
}, {
	"id": 8,
	"first_name": "Chris",
	"last_name": "Simpson",
	"email": "csimpson7@weibo.com",
	"phone": "5774832826",
	"dob": "1940-12-15",
	"city": "Ningmute"
}];