6.8 Shape Maker Day 2

OBJECTIVES:

OBJECTIVES: By the end of this lesson, students will:

    • observe that a procedure with an input parameter allow more outcomes.

    • realize that values in a procedure call (arguments), are passed into a block's input parameters.

    • understand how to access data from a list

    • observe that repeat until statement loops until condition is TRUE.

TEACHER RESOURCES:

Standards

    • CSTA 2-AP-13: Decompose problems and subproblems into parts to facilitate the design, implementation, and review of programs.

    • CSTA 2-AP-14: Create procedures with parameters to organize code and make it easier to reuse.

CSTA

DO NOW:

    1. Watch AI Experiments: Quick Draw (1:40)

    2. Discuss:

      • What things does a computer look at when it is trying to understand someone’s drawing?

      • What other areas of life will image and drawing recognition in computer science help with?

Mini-Lesson (5-10 minutes)

Unit 6.7 covers Procedures with Parameters.
Students should make sure that Unit 6.7 is done, and that they understand the concepts before exploring today's activities 6.8, which covers lists and input checking.

Concept Recap of 6.7:

Important concepts are

  • Values in Procedure call (Arguments) are passed into the block's input parameters.

  • How to access an item from a list. (refresher)

  • Repeat Until will loop until the condition is true. (refresher)

Project (20-30 minutes)

Name the shapes that ShapeMaker draws. To do this, students will

1. create a list of shape names;

2. double check user input, using repeat until, so that the user does not enter a value larger than the list length.


Demonstrate or show video of lesson ( scratch2). Students use student site and student handout to complete project.

1. Create a list:

2. Say shape name:

3. Check user input:

TEACHER GUIDANCE:


Close-Out (5 minutes)

Close-Out (5 minutes)

    1. Discuss the following questions:

      • What is the advantage of creating a procedure block with an input parameter? eg MakeShape(number of sides)

      • What other possible parameters could MakeShape have? lengthOfSide, shape, color, fill (boolean toogle with 0 = no fill, 1 fill), ....etc.

Potential Responses

Some students might ask about the difference between make-a block and broadcast.

Broadcast can communicate to many sprites. Make-a-block can only be seen inside the sprite where is was created.

Broadcast sends out a message signal, with no input parameters. Make-a-Block can have input parameters which makes it flexible and customizable.

Therefore: use broadcast to call lots of sprites: e.g. End of Game

use make-a-block, for reusable code. Add input parameters and you can customize it for many outcomes!

Recap Make-a-Block Slides