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@klippersubs/hashtable

v1.0.0

Published

Hash table implementation.

Downloads

11

Readme

@klippersubs/hashtable

Travis CI NPM version

Hash table implementation.

yarn add @klippersubs/hashtable
import HashTable, { hashString } from '@klippersubs/hashtable';

const ht = new HashTable(hashString);

ht.set('Alice', '+7 987 654‑32‑10');
ht.set('Bob', '+81 987 654‑32‑10');
ht.set('Alice', '+81 012 345‑67‑89');
ht.delete('Bob');

console.log(ht.get('Alice'));
// → '+81 012 345‑67‑89'
console.log(ht.get('Bob'));
// → undefined
console.log(ht.has('Bob'));
// → false
import { StringTable } from '@klippersubs/hashtable';

const st = new StringTable();

st.set('Alice', '+7 987 654‑32‑10');
st.set('Bob', '+81 987 654‑32‑10');
st.set('Alice', '+81 012 345‑67‑89');
st.delete('Bob');

console.log(st.get('Alice'));
// → '+81 012 345‑67‑89'
console.log(st.get('Bob'));
// → undefined
console.log(st.has('Bob'));
// → false

Exported API

Type export Hash

Callback type for calculating a hash of key.

Generic params:

  • Key — key type.

Params:

  • key: Key — a key to calculate hash.
  • capacity: number — hash table capacity.

Return value:

  • number — hash.

Export hashString

Calculates a hash of string key.

Params:

  • key: string — a key to calculate hash.
  • capacity: number — hash table capacity.

Return value:

  • number — hash.

Default export HashTable

Hash table class.

Generic params:

  • Key — key type.
  • Value — value type.

Constructor

Params:

  • hash: Hash<Key> — hash function.
  • capacity: number = 8 — capacity of the hash table.

Method set

Sets key–value pair.

Params:

  • key: Key.
  • value: Value.

Return value:

  • this.

Method get

Returns value of a key–value pair.

Params:

  • key: Key.

Return value:

  • Value.

Method has

Checks if key—value pair exists.

Params:

  • key: Key.

Return value:

  • boolean.

Method delete

Deletes key—value pair.

Params:

  • key: Key.

Return value:

  • this.

Export StringTable

Specialized hash table with string keys.

Generic params:

  • Value — value type.

Constructor

Params:

  • capacity: number = 8 — capacity of the hash table.

License

MIT