Lookups with Hash Tables you own this product

structs • arrays • slices • receiver functions • the modulus operator • bit shift operators
skills learned
chaining • linear probing • quadratic probing • double hashing
Rod Stephens
1 week · 4-6 hours per week · BEGINNER

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Look inside

As a summer intern at Ginormous Megadata Inc, you’ve been tasked with building a phone directory of the company’s 130,000 employees. The catch? Your boss won’t spring for an off-the-shelf database, the company’s firewall prevents you from searching for what you need online, and the summer isn’t long enough for you to build a full-fledged database from scratch. To complete your task, you decide to create a hash table, a data structure that enables you to use keys to store and retrieve items. You’ll experiment with different hash tables methods, including chaining, open addressing, and quadratic probing. When you’re finished, you’ll have hands-on experience creating a functional hash table you can use to build Ginormous Megadata’s phone directory, as well as a solid understanding of the trade-offs between different kinds of hash tables.

This project is designed for learning purposes and is not a complete, production-ready application or solution.

project author

Rod Stephens

Rod Stephens started out as a mathematician but discovered the fun of algorithms and has been programming ever since. Rod was a Microsoft Visual Basic Most Valuable Professional (MVP) for 15 years, has spoken to user groups and conferences, and has taught introductory programming courses. He has written more than 35 books including Essential Algorithms: A Practical Approach to Computer Algorithms Using Python and C# and Beginning Software Engineering, both of which include material related to this series of liveProjects.


This liveProject is for Go programmers, from beginning level to advanced, who want to learn how to build hash tables in Go. To begin these liveProjects you’ll need to be familiar with the following:


  • A Go compiler (such as Visual Studio Code or Online GDB)
  • The modulus operator and the bit shift operators
  • Receiver functions
  • Basic Go features (including arrays, receiver functions, structs, and slices)


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