1.2.13
Insertion Sort
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Insertion Sort
Insertion sort is a simple sorting algorithm, which is very intuitive.

The concept
- Imagine sorting a deck of cards.
- Hold the deck of cards in one hand, and place a single card down on the desk.
- Take a card from the top of the deck in your hand, and put it in the correct place in the other deck.
- Repeat until all the cards are gone.

In English
- Take the second card:
- Compare to the first card, swap if needed.
- Take the third card:
- Compare to second card, swap if needed.
- Compare to first card, swap if needed.
- Take the fourth card:
- Compare to all previous cards.
- Repeat for all cards.

Pros and cons of insertion sort
- Pros:
- Easy to implement.
- Little memory used.
- Cons:
- Not very efficient.
1Computational Thinking & Algorithms
1.1Computational Thinking
1.2Algorithms
1.2.1Algorithms1.2.2Pseudocode1.2.3Flow Diagrams1.2.4Logical Reasoning & Debugging1.2.5Reading Algorithms1.2.6Correcting Algorithms1.2.7Complete the Algorithm1.2.8Search Algorithms1.2.9Linear Search1.2.10Binary Search1.2.11Sort Algorithms1.2.12Bubble Sort1.2.13Insertion Sort1.2.14End of Topic Test - Algorithms
2Programming
2.1Programming Fundamentals
2.1.1Variables & Constants2.1.2Comments2.1.3Input & Output2.1.4Arithmetic Operators2.1.5Relational Operators2.1.6Boolean Operators2.1.7Sequence2.1.8Selection2.1.9Iteration2.1.10Subroutines2.1.11Scope2.1.12Data Types2.1.13Casting2.1.14Arrays2.1.152D Arrays2.1.16Lists2.1.172D Lists2.1.18Strings2.1.19Syntax Errors2.1.20Logic Errors2.1.21Runtime Errors2.1.22End of Topic Test - Programming
2.2Designing Code
3Hardware & Software
3.1Hardware
3.2Software
4Data
5The Internet
6Online Safety & Security
6.1Protecting Yourself Online
Jump to other topics
1Computational Thinking & Algorithms
1.1Computational Thinking
1.2Algorithms
1.2.1Algorithms1.2.2Pseudocode1.2.3Flow Diagrams1.2.4Logical Reasoning & Debugging1.2.5Reading Algorithms1.2.6Correcting Algorithms1.2.7Complete the Algorithm1.2.8Search Algorithms1.2.9Linear Search1.2.10Binary Search1.2.11Sort Algorithms1.2.12Bubble Sort1.2.13Insertion Sort1.2.14End of Topic Test - Algorithms
2Programming
2.1Programming Fundamentals
2.1.1Variables & Constants2.1.2Comments2.1.3Input & Output2.1.4Arithmetic Operators2.1.5Relational Operators2.1.6Boolean Operators2.1.7Sequence2.1.8Selection2.1.9Iteration2.1.10Subroutines2.1.11Scope2.1.12Data Types2.1.13Casting2.1.14Arrays2.1.152D Arrays2.1.16Lists2.1.172D Lists2.1.18Strings2.1.19Syntax Errors2.1.20Logic Errors2.1.21Runtime Errors2.1.22End of Topic Test - Programming
2.2Designing Code
3Hardware & Software
3.1Hardware
3.2Software
4Data
5The Internet
6Online Safety & Security
6.1Protecting Yourself Online
Practice questions on Insertion Sort
Can you answer these? Test yourself with free interactive practice on Seneca — used by over 10 million students.
- 1What is the main disadvantage of insertion sort?Multiple choice
- 2Benefits of insertion sort:Fill in the list
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