RANK TREE

A sort set based on red-black tree.

## Installation

npm install rank-tree

Usage

Example

const { Rank } = require("rank-tree");

let rank = new Rank();

// ...do somethings for value rank

API

The following methods are supported.

name	opts	performance
tadd	[k: string, v: number]	O(logn)
trem	[k: string]	O(logn)
tincrease	[k: string, v: number]	O(logn)
treduce	[k: string, v: number]	O(logn)
trank	[k: string]	O(logn)
tcount	[minV: number, maxV: number]	O(logn)+m
tcard	[]	O(1)
trange	[minI: number, maxI?: number]	O(logn)+m
trevrangebyscore	[minV: number, maxV?: number]	O(logn)+m
tgetall	[]	O(n)
tscore	[k: string]	O(1)
tgetwithindex	[index: number]	O(logn)

Details

"tadd"

Insert a <key-value> pair into the rank set, and override if the key already exists.

let rank = new Rank();
rank.tadd("a", 1);
rank.tadd("b", 2);
rank.tadd("c", 3);

// tree
[a:1, b:2, c:3]

"trem"

Find and delete the specified key.

// tree
[a:1, b:2, c:3, d:4]

let rank = new Rank();
rank.trem("a");
rank.trem(["b", "c"]);

// tree
[d:4]

"tincrease"

Increases the value of the specified key.

// tree
[a:1, b:2]

let rank = new Rank();
rank.tincrease("a", 2);
rank.tincrease("c", 1);

// tree
[c:1, b:2, a:3]

"treduce"

Reduces the value of the specified key.

// tree
[a:1, b:2]

let rank = new Rank();
rank.treduce("a", 2);
rank.treduce("c", 1);

// tree
[c:-1, a:0, b:2]

"trank"

Gets the ranking of the specified key.

// tree
[a:17, b:20, c:31]

let rank = new Rank();
rank.trank("a");  // 1
rank.trank("c");  // 3

"trange"

Gets values between rankA and rankB

// tree
[a:17, b:20, c:31, d:56]

let rank = new Rank();
rank.trange(2, 3);  // [b:20, c:31]
rank.trange(1, 1);  // [a:17]
rank.trange(3);     // [c:31, d:56]

"tcard"

Gets total nodes count.

// tree
[a:17, b:20, c:31, d:56]

let rank = new Rank();
rank.tcard();  // 4

"tcount"

Gets the quantity of nodes with values between vA and vB.

// tree
[a:17, b:20, c:31, d:56]

let rank = new Rank();
rank.tcount(21, 31);  // 1
rank.tcount(20, 31);  // 2

"trevrangebyscore"

Gets the nodes with values between vA and vB.

// tree
[a:17, b:20, c:31, d:56]

let rank = new Rank();
rank.trevrangebyscore(21, 31);  // [c:31]
rank.trevrangebyscore(20, 31);  // [b:20, c:31]

"tgetall"

Gets all nodes.

// tree
[a:17, b:20, c:31, d:56]

let rank = new Rank();
rank.tgetall();  // [a:17, b:20, c:31, d:56]

"tscore"

Gets all value with key.

// tree
[a:17, b:20, c:31, d:56]

let rank = new Rank();
rank.tscore("a");  // 17

"tgetwithindex"

Gets all value with rank.

// tree
[a:17, b:20, c:31, d:56]

let rank = new Rank();
rank.tscore(2);  // 20

Test

npm test

License

This repository is licensed under the "MIT" license. See LICENSE.