bacali95Sweet Collections
Typescript implementations of in-memory cache data-structures for Node and Browser. These data-structures are:
- LruMap: A fixed size
Mapwhich removes the least recently used entry. - LruSet: A fixed size
Setwhich removes the least recently used entry. (Backed by aLruMap) - LfuMap: A fixed size
Mapwhich removes the least frequently used entry. - LfuSet: A fixed size
Setwhich removes the least frequently used entry. (Backed by aLfuMap) - SortedArray: An
Arraythat stays sorted after any modification. - SortedMap: A
Mapwith entries stays sorted by key after any modification. (Backed by aSortedArray) - SortedSet: A
Setwith entries stays sorted after any modification. (Backed by aSortedArray) - Heap: A collection that have always the largest, smallest or most relevant value on top.
- Stack: A collection that have always the last added value on top.
- Queue: A collection that have always the first added value on top.
Install
npm install --save sweet-collections
or
yarn add sweet-collections
Usage
<summary>LruMap</summary>
Typescript
import { LruMap } from 'sweet-collections';
const map = new LruMap<number, number>(3);
map.set(1, 1);
map.set(2, 2);
map.set(3, 3); // least recent used: 1
console.log(map.has(1)) // true, least recent used: 2
console.log(map.get(2)) // 1, least recent used: 3
map.set(4, 4);
console.log(map.has(3)) // false
console.log(map.get(3)) // undefined
console.log(map.isFull()) // true
map.delete(1);
console.log(map.size) // 2
map.clear();
console.log(map.size) // 0
<summary>LruSet</summary>
Typescript
import { LruSet } from 'sweet-collections';
const set = new LruSet<number>(3);
set.add(1);
set.add(2);
set.add(3); // least recent used: 1
console.log(set.has(1)) // true, least recent used: 2
set.add(4);
console.log(set.has(2)) // false
console.log(set.isFull()) // true
set.delete(1);
console.log(set.size) // 2
set.clear();
console.log(set.size) // 0
<summary>LfuMap</summary>
Typescript
import { LfuMap } from 'sweet-collections';
const map = new LfuMap<number, number>(3);
map.set(1, 1);
map.set(2, 2);
map.set(3, 3); // least frequently used: 1
console.log(map.has(1)) // true, least frequently used: 2
console.log(map.get(2)) // 1, least frequently used: 3
map.set(4, 4);
console.log(map.has(3)) // false
console.log(map.get(3)) // undefined
console.log(map.isFull()) // true
map.delete(1);
console.log(map.size) // 2
map.clear();
console.log(map.size) // 0
<summary>LfuSet</summary>
Typescript
import { LfuSet } from 'sweet-collections';
const set = new LfuSet<number>(3);
set.add(1);
set.add(2);
set.add(3); // least frequently used: 1
console.log(set.has(1)) // true, least frequently used: 2
console.log(set.has(2)) // true, least frequently used: 3
set.add(4);
console.log(set.has(3)) // false
console.log(set.isFull()) // true
set.delete(1);
console.log(set.size) // 2
set.clear();
console.log(set.size) // 0
<summary>SortedArray</summary>
Typescript
import { SortedArray } from 'sweet-collections';
// Increasing order sorted array
const array = new SortedArray<number>((a: number, b: number) => a - b);
array.push(4);
array.push(1);
array.push(2);
array.push(3);
array.push(5);
console.log(array.toArray()); // [1, 2, 3, 4, 5]
console.log(array.get(2)); // 3
console.log(array.get(4)); // 5
console.log(array.length); // 5
array.delete(4);
console.log(array.toArray()); // [1, 2, 3, 5]
console.log(array.includes(4)); // false
array.push(1);
console.log(array.toArray()); // [1, 1, 2, 3, 5]
console.log(array.count(1)); // 2
console.log(array.firstIndexOf(1)); // 0
console.log(array.lastIndexOf(1)); // 1
console.log(array.shift()); // 1
console.log(array.pop()); // 1
console.log(array.min()); // 1
console.log(array.max()); // 3
console.log(array.toArray()); // [1, 2, 3]
<summary>SortedMap</summary>
Typescript
import { SortedMap } from 'sweet-collections';
// Increasing order sorted map
const map = new SortedMap<number, string>((a: number, b: number) => a - b);
map.set(3, 'c');
map.set(2, 'd');
map.set(5, 'a');
map.set(4, 'b');
map.set(1, 'e');
console.log([...map.keys()]); // [1, 2, 3, 4, 5]
console.log([...map.values()]); // ["e", "d", "c", "b", "a"]
console.log(map.get(2)); // "d"
console.log(map.get(4)); // "b"
console.log(map.size); // 5
map.delete(4);
console.log([...map.keys()]); // [1, 2, 3, 5]
console.log([...map.values()]); // ["e", "d", "c", "a"]
console.log(map.has(4)); // false
<summary>SortedSet</summary>
Typescript
import { SortedSet } from 'sweet-collections';
// Increasing order sorted set
const set = new SortedSet<number>((a: number, b: number) => a - b);
set.add(3);
set.add(2);
set.add(5);
set.add(4);
set.add(1);
console.log([...set.keys()]); // [1, 2, 3, 4, 5]
console.log(set.has(2)); // true
console.log(set.has(4)); // true
console.log(set.size); // 5
set.delete(4);
console.log([...set.keys()]); // [1, 2, 3, 5]
console.log(set.has(4)); // false
<summary>Heap</summary>
Typescript
import { Heap } from 'sweet-collections';
// Heap with the maximum value on top
const heap = new Heap<number>((a: number, b: number) => a > b);
heap.push(3);
heap.push(2);
heap.push(5);
heap.push(4);
heap.push(1);
console.log(heap.peek()); // 5
console.log(heap.pop()); // 5
console.log(heap.peek()); // 4
console.log(heap.replace(0)); // 4
console.log(heap.peek()); // 3
<summary>Stack</summary>
Typescript
import { Stack } from 'sweet-collections';
const stack = new Stack<number>();
stack.push(3);
stack.push(2);
console.log(stack.top()); // 2
stack.push(5, 4, 1);
console.log(stack.pop()); // 1
console.log(stack.top()); // 4
console.log(stack.size); // 4
<summary>Queue</summary>
Typescript
import { Queue } from 'sweet-collections';
const queue = new Queue<number>();
queue.push(3);
queue.push(2);
console.log(queue.pop()); // 3
queue.push(5, 4, 1);
console.log(queue.pop()); // 2
console.log(queue.peek()); // 5
console.log(queue.size); // 3
Author
👤 Nasreddine Bac Ali
- Website: nasreddinebacali.info
- Github: @bacali95
- LinkedIn: @bacali
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📝 License
Copyright © 2021 Nasreddine Bac Ali. This project is ISC licensed.