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Lesson 4.4: List Practice II

Learning Objectives

Students will be able to...

  • Traverse a list, accessing each element one at a time
  • Perform operations combining all elements in a list
  • Select defined subsets of elements in a list

Materials/Preparation

Pacing Guide

Duration Description
5 minutes Welcome, attendance, bell work, announcements
10 minutes Review and debrief lab 4.3
25 minutes Activity
15 minutes Debrief and wrap-up

Instructor's Notes

  • Review
    • Ask students to define "traversal" and outline the basic code pattern
      • You need not write actual code here, but have students mention the key points (index variable, use index to access each item, repeat length of list, etc.)
    • Review solutions to lab 4.3

      • Ask a student to provide their solution to each part

      • Discuss errors or flaws in each solution

      • Point out similarities between each part, emphasizing that the basic code pattern is the same each time with only the operation performed on each item changing

        • If you feel students can handle it, you can further classify various traversals (maps, filters, folds)

      • If necessary, provide the basic code pattern for a traversal again:

        simple list traversal

  • Activity
    • Students should complete the "Number Cruncher" lab individually
      • The operations in this lab are fairly similar to those in lab 4.3, but work with lists of numbers instead of names. As a result, students should progress more quickly.
      • As in lab 4.3, help students realize that the basic code pattern in each part will be the same.
  • Debrief
    • Ask one or two students to share their solution to each part of the lab
      • If all students seem to grasp the concept, not all parts need to be reviewed
      • If skipping some parts, be sure to review at least parts 1.1 (a fold), 2.1 (a map) and 2.2 (a filter)
    • Point out that the solutions from labs 4.3 and 4.4 will look quite similar, even though in lab 4.3 the lists contained names in in lab 4.4 they contained numbers
      • The traversal code pattern is the same regardless of the type of elements in the list

Accommodations/Differentiation

  • Advanced students should complete both bonus parts of the lab (1.5 and 2.3) and then assist struggling students.
  • Students who need more assistance should focus on parts 1.3, 2.1, and 2.2. Ensure that all students are able to complete at least these three parts before concluding the lesson.

Forum discussion

Lesson 4.4: List Practice II (TEALS Discourse account required).