unit2_description.md

Unit 2

Objective

Write an interactive application using JavaScript

Intro to Programming

• Distinguish between Primitive and Reference types

  • List types and describe which ones are primitive and which are reference types
  • Describe the difference between primitive and reference types
  • Describe the difference between == and ===

• Write and evaluate JS expressions

  • Use operators &&, ||
  • String concatenation
  • Math operations
  • Precedence / parenthesis
  • Prefix / Postfix notation for integers
  • Variables (var, let, const)
  • Literals

Arrays

• Create, store, and update data with arrays and objects
  • Create arrays using the array literal syntax
  • Access and store data with arrays and objects using bracket notation
  • Use basic native array methods such as push, pop, shift, and unshift to manipulate arrays
  • Describe when it's better to use either data structure

Loops

• Control the flow of programs with conditionals and loops
  • Describe and build incrementing and decrementing for loops

Objects

• Create, store, and update data with arrays and objects
  • Create objects using the object literal syntax
  • Access and store data with arrays and objects using bracket notation
  • Access and store data with objects using dot notation
  • Use Object.keys to pull keys from an object
  • Describe when it's better to use either data structure

Control Flow

• Control the flow of programs with conditionals and loops
  • Implement if/else statements based on conditional statements
  • Implement switch case statements
  • Return conditional statements instead of explicitly returning true/false

Functions

• Organize code with functions

  • App has multiple (10-15) functions
  • Functions have 0-2+ parameters
  • Functions call each other
  • Some functions return values
  • Some functions mutate state (console log, dom, file systems etc...)

• Define and call functions that have variable parameters

  • Define and call functions that use the arguments keyword
  • Define and call functions that use the spread operator
  • Define and call functions that have default parameters

Accumulator Pattern

• Solve problems with accumulator patterns
  • Implement filter, map
  • Implement join, toSentence (last objects have 'and')
  • Implement some, every, none
  • Implement sum, min, max, average
  • Implement leftpad, rightpad, indexOf
  • Group an array of objects by a property
  • Index an array of objects by a property

Hoisting, Scope, && Memory Diagrams

• Describe and evaluate scope in JavaScript

  • Describe how hoisting works
  • Describe the various kinds of scope in JavaScript
  • Define and describe IIFEs and why they are used

• Solve problems that require memory references

  • Construct nested objects from memory diagrams using both literals and dot notation
  • Draw memory diagrams from literals / snippets of code with dot notation

Clean Code

• Refactor code according to DRY

  • Recognize the need for DRY refactorings
  • Extract methods

• Refactor code according to SRP

  • Correctly identify the heuristic to apply to a given big function
  • Perform a refactoring