Run results for: 2-tier vs 3-tier Object.assign vs 3-tier spread vs 3-tier constructor

This demonstrates the difference in performance between 2-tier architectures, which simply return database objects through controllers from the repositories vs 3-tier architectures which run some sort of service layer mapping to obfuscate unnecessary db information from both the controller layer and, subsequently, the front-end. Such mapping logic will ideally use Object.assign, the spread operator, or perhaps an explicit constructor mapping.

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/67.0.3396.99 Safari/537.36

Browser: Chrome 67

Operating system: Windows

Device Platform: Desktop

Date tested: 6 years ago

Test name	Executions per second
2-tier	782492800.0 Ops/sec
3-tier Object.assign	360045.4 Ops/sec
3-tier spread	516791.3 Ops/sec
3-tier constructor	98772.0 Ops/sec

Tests:

2-tier
var dbData = { databaseIdName: "5d493b95-6255-4662-8de5-875370997a7c", a: 1, b:"hello", c: true, d:7, e: "test", f: "getting", g: "longer", h: false, i: "but more realistic for enterprise development" }; return dbData;
3-tier Object.assign
var dbData = { databaseIdName: "5d493b95-6255-4662-8de5-875370997a7c", a: 1, b:"hello", c: true, d:7, e: "test", f: "getting", g: "longer", h: false, i: "but more realistic for enterprise development" }; var appData = Object.assign({ id: dbData.databaseIdName }, dbData); delete appData.databaseIdName; return appData;
3-tier spread
var dbData = { databaseIdName: "5d493b95-6255-4662-8de5-875370997a7c", a: 1, b:"hello", c: true, d:7, e: "test", f: "getting", g: "longer", h: false, i: "but more realistic for enterprise development" }; var { databaseIdName, ...appData } = dbData; appData.id = databaseIdName; return appData;
3-tier constructor
var dbData = { databaseIdName: "5d493b95-6255-4662-8de5-875370997a7c", a: 1, b:"hello", c: true, d:7, e: "test", f: "getting", g: "longer", h: false, i: "but more realistic for enterprise development" }; class AppData { constructor(databaseIdName, a, b, c, d, e, f, g, h, i){ this.id = databaseIdName; this.serviceA = a; this.serviceB = b; this.serviceC = c; this.serviceD = d; this.serviceE = e; this.serviceF = f; this.serviceG = g; this.serviceH = h; this.serviceI = i; } } var appData = new AppData( dbData.databaseIdName, dbData.a, dbData.b, dbData.c, dbData.d, dbData.e, dbData.f, dbData.g, dbData.h, dbData.i ) return appData;