colleen lewis
I'm an Associate Professor of CS at the University of Illinois Urbana-Champaign. I was previously the McGregor-Girand Associate Professor of CS at Harvey Mudd College. I research equitable and efficient teaching practices and curate CSTeachingTips.org, a NSF-sponsored project for disseminating effective CS teaching practices.
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Tracing Method Calls in Java - within the file
Tracing method calls in Java - Visualizing a call stack
Python assignment statements - Reading and writing the value of variables
Experience Report: Physical Models of Java Inheritance
Java HashSet Chaining Algorithm - 3D Representation
Java HashSet Open Addressing Algorithm - 3D Representation
Review of Java HashSet Properties
Introduction to Java HashSet Properties
HashSet Diagrams Explanation - Chaining & Open Addressing Algorithms
3D Java HashSet Explanation - Chaining & Open Addressing Algorithms
APCSA - Quicksort Algorithm In-Place vs. Merge Sort (Part 2 of 3)
APCSA - Quicksort Algorithm Performance (Part 3 of 3)
APCSA - Quicksort Algorithm (Part 1 of 3)
APCSA - Binary Search Algorithm
APCSA - Sorting Algorithm Comparison
Java explanations - Overview (
Preview - Unit 2a APCSA - Annotated Anchor Code
Preview - Unit 2b APCSA - Annotated Anchor Code
APCSA - Unit 2a - Annotated Anchor Code
Unit 1 - Types: Variables can hold different types
Preview - Unit 1 APCSA - Annotated Anchor Code
Unit 2-String Alias: In an assignment statement, we always copy the value in the variable-Java APCSA