Learn JavaScript

Lesson 8 of 9 · Objects, Destructuring, Spread and JSON

Module 8 · Objects, Destructuring, Spread and JSON

Cheat Sheet: Every Object Operation and Copy Rule on One Page

ProReading

Keep this page open while you solve the problems of this module. The first table answers "does it change my object?", the question behind most object bugs. The second lists every operation with what it returns and what it costs. The last two tables are the copy rules and the choice of shape.

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What is inside Cheat Sheet: Every Object Operation and Copy Rule on One Page

  1. Changes the object, or returns a new one
  2. Every operation on one table
  3. Key order
  4. Which copy, which shape

Module test

Ten questions on this module. Pass at 70%, and you can take it as many times as you like.

Take the module test