Learning objective
Hash tables: Be familiar with the concept of a hash table and its uses. A hash table is a data structure that creates a mapping between keys and values. Be able to apply simple hashing algorithms. Know what is meant by a collision and how collisions are handled using rehashing. A collision occurs when two key values compute the same hash.
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Hash tables
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Hash tables
Aqa A Level Computer ScienceFundamentals of data structures
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Quick explanation
Hash tables: Be familiar with the concept of a hash table and its uses. A hash table is a data structure that creates a mapping between keys and values. Be able to apply simple hashing algorithms. Know what is meant by a collision and how collisions are handled using rehashing. A collision occurs when two key values compute the same hash
- This point belongs to Hash tables, especially Hash tables.
- You need to be able to hash tables: Be familiar with the concept of a hash table and its uses. A hash table is a data structure that creates a mapping between keys and values. Be able to apply simple hashing algorithms. Know what is meant by a collision and how collisions are handled using rehashing. A collision occurs when two key values compute the same hash.
- Use the linked flashcards and practice questions to check recall, then practise applying the idea in an exam-style answer.
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This objective helps connect Hash tables to exam-style questions, flashcards, and revision notes for Hash tables.
Quick student answer
What is the main purpose of a hash table?
Direct answer
To create a mapping between keys and values
Key terms
- Hash table: A data structure that creates a mapping between keys and values.
- Collision: An event in which two key values compute the same hash.
Common trap
Confusing a collision with duplicate values: A collision occurs when two different key values compute the same hash; the associated values do not have to be identical.
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