Hashset NPM | npm.io

HasSet

A simple hash set in JavaScript

Create a new HashSet

var HashSet = require('hashset');

//Create an empty hash set
var hashset = new HashSet();

//Create a hash set an initialize it with a value 'a'
var hashset = new HashSet('a');

//Create a hash set an initialize it with a set of values
var hashset = new HashSet('a', 'b', 'c');

//Create a hash set an initialize it with 3 different values
var hashset = new HashSet(1, '1', [1]);

Properties

length

Get the length of the hash set

hashset.length;

Methods

equals

Test whether current hash set equals to another

var hashset1 = new HashSet(1, 2, 3, 4, 5);
var hashset2 = new HashSet(1, 2, 3, 4, 5);
var result = hashset1.equals(hashset2); //true

contains

Check whether a value is in the hash set

hashset.contains(val);

add

Add a new value into the hash set

hashset.add(val);

remove

Remove a value from the hash set

hashset.remove(val);

Removing an non-existing value will not trigger any error

toArray

Convert and output all values into an array

var hashset = new HashSet(1, 2, 3);
hashset.toArray();  // [1, 2, 3]

There is no gurantee the values of the output array the same sequence as value added to the hash set.

isSubSetOf

Test whether a hash set is a sub set of another. Empty hash set is a sub set of any other hash set including another empty hash set.

var hashset1 = new HashSet();
var hashset2 = new HashSet();
var result = hashset1.isSubSetOf(hashset2);

isSuperSetOf

Test whether a hash set is a super set of another. Any hash set is a super set of empty hahs set including an empty hash set.

var hashset1 = new HashSet(1, 2, 3);
var hashset2 = new HashSet(1, 2, 3);
var hashset3 = new HashSet();
var result1 = hashset1.isSuperSetOf(hashset2); //true
var result2 = hashset2.isSuperSetOf(hashset1); //true
var result3 = hashset1.isSuperSetOf(hashset3); //true
var result3 = hashset3.isSuperSetOf(hashset1); //false

unionWith

Union current hash set with another

var hashset1 = new HashSet(1, 2);
var hashset2 = new HashSet(2, 3);
hashset1.unionWith(hashset2);
hashset1.contains(1); //true
hashset1.contains(2); //true
hashset1.contains(3); //true

intersectWith

Intersect current hash set with another

var hashset1 = new HashSet(1, 2, 3);
var hashset2 = new HashSet(2, 3, 4);
hashset1.intersectWith(hashset2);
hashset1.length; //2
hashset1.contains(2); //true
hashset1.contains(3); //true
hashset1.contains(4); //false