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Computer Science (First Exam 2027)

How Does Binary Search Work?

Learn how binary search repeatedly halves a sorted data set, follow a worked example, and use accurate IB Computer Science exam terminology.

B2.4 Programming algorithms

How Does Bubble Sort Work?

Learn how bubble sort compares and swaps adjacent values, traces each pass through a list, analyses efficiency, and uses clear, exam-ready IB pseudocode.

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Every question IB students actually ask.

Computer Science (First Exam 2027)

How Does Binary Search Work?

How Does Bubble Sort Work?

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IB Subjects

MYP Subjects

Computer Science (First Exam 2027)

How Does Binary Search Work?

How Does Bubble Sort Work?

How Does Selection Sort Work?

What's the Time and Space Complexity of Bubble Sort vs Selection Sort?

What Is Recursion and How Does It Work? (HL)

What Are the Advantages and Limitations of Recursion? (HL)

How Does Quicksort Work Using Recursion? (HL)

What Problems Are Best Solved With Recursion? (HL)

How Do You Trace a Recursive Algorithm? (HL)

How Do You Open, Read, Write, and Close a File in Python or Java?

What's the Difference Between Read; Write; and Append File Modes?

What Do open(), read(), readline(), write(), and close() Do in Python?

What Do Scanner, FileWriter, and BufferedReader Do in Java?

What Are the Core Concepts of OOP (Classes; Objects; Inheritance; Encapsulation; Polymorphism)?

What Are the Advantages and Disadvantages of Object-Oriented Programming?

How Do You Design a Class and Its Methods?

What Is a UML Class Diagram?

What's the Difference Between a Static and Non-Static (Instance) Variable/Method?

How Do You Define a Class and Instantiate an Object From It?

What Does a Constructor Do?

What Is Encapsulation and Information Hiding?

What's the Difference Between Private and Public Access Modifiers?

How Does Inheritance Let a Child Class Reuse a Parent Class's Code?

What's the Difference Between Private, Public, Protected, and Default Access Modifiers in Inheritance?