(Francais) E3: Unplugged - Functions

1. Have student groups take turns sharing their verses with the class. Encourage them to:
   • Explain their thinking (e.g., “We chose to add this obstacle to our verse because we thought it was funny”).
2. Encourage students to give each other feedback on their verses. Possible questions/feedback includes:
   • “How did you (come up with those obstacles)?”
   • “What if you (added another verse)?”

• How do you use functions in your real life? (Sample response: “I use functions when I take a bath or get dressed.”)
• Why are functions important? What would happen in our lives if we didn’t use functions? (Sample response: “Functions help us to do basic tasks in our lives without too much thought. If we didn’t use functions, it would take us a very long time to do the most basic activities.”)

• Use our Evaluation Rubric to review students' work and presentations.
• [Optional] Share your students' work with the world using @logicsacademy and #dashanddot!

1. Ask, “What are functions?”
   • Sample response: “Functions are pieces of code that can be repeated over and over, just like the chorus of a song.”
2. Say, “We will be using the song 'Going on a Bear Hunt' to practice using functions.”
   • Watch Michael Rosen and Helen Oxenbury’s version of 'Going on a Bear Hunt' on TeacherTube: http://www.teachertube.com/video/we8217re-going-on-a-bear-hunt-274958.
   • Have students follow along with the song two or three times.
3. Put students in groups of 2–3 and pass out the Bear Hunt Student Worksheet.
   • Ask groups to discuss things that they notice about the song. (Sample responses: “The lyrics of the song are not in the proper order,” or “Parts of the song repeat themselves.”)
   • Ask students to cut out the boxes in the Bear Hunt Student Worksheet and place the pieces of the song in order.
4. Ask, “If I had asked you to write this entire song out by hand, it would take a very long time. What could we do to make the song shorter and faster to write?”
   • Sample response: “Label the parts of the song that repeat as Chorus. Therefore, after the first time they are used, you can simply write Chorus in place of those lyrics.”
5. Say, “A chorus of a song and a function in coding are similar. A function is a piece of code that repeats, and a chorus is a part of a song that repeats. They can both be called upon without having to rewrite them each time.”

Have students work on the following activities in small groups. We recommend 2–3 students per group.

When students work together while coding, they’re able to help each other identify mistakes and develop creative solutions!

1. Say, “We will be writing our own version of 'Going on a Bear Hunt,' but this time we will use functions to make it easier. Your song will be called 'Going on a Dash Hunt.'"
2. On the board, write Chorus and write the chorus of the song below it:
   
3. Say, “The chorus of this song will act as our Function. Whenever we want to repeat the chorus, we will write “Chorus.” This is how we call our “Chorus” Function instead of writing all the words each time.”
4. On an index card, have each group of students write their own verse of the song about obstacles to get through while looking for Dash. Write the following sample lyrics on the board for the students to reference:
5. Collect all the index cards that contain the verses and tape them to the board in order. Work with the class to rewrite the remaining lyrics of the song, based on a scary place they might find Dash and the obstacles students have provided in their verses. The lyrics should be similar to the following:
6. Say, “We already have our “Chorus” Function written. Every time the chorus repeats, we’re just going to write Chorus on the board.” The finished song should look something like the following:
   
7. Ask, “After writing our own version of this song, are you glad you used functions? Why or why not?
   • Sample Response: “I am glad I used functions because using them made writing this chant much easier and faster.”
8. Optional: Have the class perform the song, with each group acting out their verse and the whole class acting out the remaining lyrics.
   • Invite one student to play the role of Dash.

1. Say, “We have learned quite a bit about programming. Turn to your partner and tell him or her two things you have learned about programming.”
   • Sample response: “I have learned that when I use a loop, whatever is inside it is repeated. I have also learned that another word for If statements is conditionals.”
2. Say, “How can loops and conditionals help us make our code more efficient?”
   • Sample response: “Loops help us repeat parts of the code so you don’t have to list those steps over and over again.”

1. Say, “Today we are going to learn about a new coding concept: functions.”
2. “You use functions everyday for the routines in your life. Often, when you do things over and over, you don’t have to think about each separate part of the task; your body knows what to do automatically.” Discuss real-life examples of functions.
   • When you brush your teeth, you don’t think, “I’m going to put water on my toothbrush. I’m going to open the toothpaste. I’m going to put toothpaste on my toothbrush. I’m going to brush my front teeth. I’m going to brush my back teeth. I’m going to put water in my mouth and spit out the water and toothpaste into the sink.” Instead, you think, “I’m going to brush my teeth.” This is an example of a function.
3. Watch Code.org’s video about functions: https://studio.code.org/s/coursee-draft/stage/6/puzzle/1.
4. Say, “A function is when a part of a code is repeated and can be called throughout the program. Functions are used when you need to repeat a piece of code several times.”
   • Discuss examples of when you would want to use a function in a program (e.g., when you want Dash to perform the same dance at different times in the program).

• What is a function and when do you use it? (Sample response: “Functions are used when you need to repeat a piece of code several times.”)
• When might you use a function in real life? (Sample response: “You might use a function when you write or sing a song because the choruses of songs are like functions.”)

Before this lesson, we recommend that students complete:

• Level A-D Lessons: All
• Level E: Lessons 1-2
• [Optional] Level A-D Challenge Cards: All
• [Optional] Level E Challenge Cards: E 1.1-2.3