Code.org Unit 4

Unit 4 Lessons 1-2 -- Variables

ASSIGNMENT FOR Thursday, Nov. 10

COMPLETE ALL LEVELS IN UNIT 4 LESSONS 1 and 2 --

WHEN COMPLETED THEY WILL ALL BE GREEN

The videos below will help you through Code.org Unit 4 Lessons 1-2 for today.

Lesson 1: Variables Explore

• Video 1: Unit 4 Google Slides Presentation (this will go through each level)

• Video 2: Guide to Explore Lessons (Go through this for understanding but you will
  not have the supplies for the actual activity)

• Video- CS Principles: Intro to Variables - Part 1

• Video- CS Principles: Intro to Variables - Part 2

• Some Variable Vocabulary

  • 1. Numbers - Digits 0-9

    2. Strings - Any characters inside quotes""

    3. Line Number, Command to create Variable, Variable's Name

    4. Expression: a combination of operators and values that evaluates to a single value

    5. Variable: holds one value at a time

    6. Assignment Operator: allows a program to change the value represented by a variable

Key Takeaways

• Numbers and strings are two different types of values

• Expressions evaluate to a single new value

• When variables are in the expression just make a copy, don’t change the actual variable.

• Variables are “assigned” a new value

• Evaluate first, then assign

• Old values are deleted forever.

• Assignment just moves information around. It does not “connect” variables.

NOT FOR TODAY

Lesson 4: Variables Make

• Video- Guide to Make Lessons

• Using Programming Patterns and a step-by-step approach make your own version of a Photo Liker app (10pts)

• Activity Guide - Photo Liker App (5pts)

• Help Video- Mr. Kaiser Photo Liker Help Video