grouping objects into a collection of unordered and unchangeable items

grouping objects into a collection of unordered but changeable key-value pairs

grouping objects into a collection of ordered but unchangeable items

grouping objects into a collection of ordered and changeable items

performing operations on plain text variables

collecting several items in one container

differentiating const + let + var when declaring variables

storing data into named containers

looking at and manipulating numbers in JavaScript

looking at and manipulating plain text in JavaScript

summarizing the building blocks of web app data