Page 30 - JavaScript

Object.defineProperty 394

Read-Only property 394

Non enumerable property 395

Lock property description 395

Accesor properties (get and set) 396

Properties with special characters or reserved words 396

All-digit properties: 397

Dynamic / variable property names 397
Arrays are Objects 398

Object.freeze 399

Object.seal 400

Creating an Iterable object 401

Object rest/spread (...) 401

Descriptors and Named Properties 402

meaning of fields and their defaults 403
Object.getOwnPropertyDescriptor 404

Object cloning 404

Object.assign 405

Object properties iteration 406

Retrieving properties from an object 407

Characteristics of properties : 407

Purpose of enumerability : 407

Methods of retrieving properties : 407

Miscellaneous : 409

Convert object's values to array 409

Iterating over Object entries - Object.entries() 410

Object.values() 410

Chapter 72: Performance Tips 412

Introduction 412

Remarks 412

Examples 412

Avoid try/catch in performance-critical functions 412