set-operations

Javascript Set operations with Arrays & Objects.

Installation

npm i set-operations

tests

npm run test

build

npm run build

modules

• isSuperSet
• isSubSet
• union
• intersection
• difference
• symmetric difference

args

isSubset, isSuperSet: (A, B)

• A - Array | obj
• B - Array | obj

returns boolean

union, intersection, difference, symmetric difference: (A, B)

• arrA - Array | obj
• arrB - Array | obj

returns Array | obj

Examples:

isSuperSet

Superset (A ⊇ B) : check if A is superset of B, i.e all elements of B are also elements of A.

import {isSuperSet} from "set-operations";

isSuperSet([1, 8, 3, 5], [3, 8]);
// true

isSuperSet([1, 8, 3, 5], [3, 9]);
// false

isSuperSet(['apple', 'orange', 'banana'], ['banana']);
// true

isSuperSet({id:'xyz', name:"john doe",age:59, work:"janitor"},{id:'xyz', work:"janitor"});
// true

isSuperSet({id:'xyz', name:"john doe",age:59, work:"janitor"},{id:'xyz', work:"janitor", likes:"football"});

// false

isSubSet

Subset (A ⊆ B) : check if A is subset of B, i.e all elements of A are also elements of B.

import {isSubSet} from "set-operations";

isSubSet([4, 5], [1, 9, 4, 8, 34, 43, 5]);
// true

isSubSet(["red", "blue"], ["violet", "indigo", "blue", "green", "yellow", "orange", "red"]);
// true

isSubSet({id:'xyz', work:"janitor"},{id:'xyz', name:"john doe",age:59, work:"janitor"})
//true

isSubSet({a:1,b:2,c:3},{b:2,c:3});
//false

union

Union (A ∪ B): create a Arr/obj that contains the elements of both A and B.

import {union} from "set-operations";

union(["rio", "delhi", "nairobi"], ["morocco", "algeria", "texas"]);

// [ "rio", "delhi", "nairobi", "morocco", "algeria", "texas" ]

union({firstname:"john", lastname:"doe"},{age:59, hobbies:["fishing", "cycling"]})

// {firstname:"john",lastname:"doe",age:59,hobbies:["fishing", "cycling"]}

note:for objects, union puts the elements of A and elements of B in to a new object - {...A, ...B,}, if the keys of elements in both A and B are same then the elements of B replaces elements of A.

intersection

Intersection (A ∩ B): create a Arr/obj that contains those elements of A that are also in B.

import {intersection} from "set-operations";

intersection([67, 21, 52, 78, 32, 321, 98, 97], [342, 52, 63, 89, 21]);

// [ 21, 52 ]

intersection({a: {a: 1, b: {c: 2,d:3}}, b: 2, c: 3, d: 4, e: 5},
             {e: 5, f: 6, c: 3, a: {a: 1, b: {c: 2, d: 3}}}
            )

//{ a: { a: 1, b: { c: 2, d: 3 } }, c: 3, e: 5 }

difference

Difference (A \ B): create a Arr/obj that contains those elements of A that are not in B.

import {difference} from "set-operations";

difference([43, 562, 52, 223, 652, 1], [43, 42, 524, 542, 100, 52]);

// [ 562, 223, 652, 1 ]

difference({a: {a: 1, b: {c: 2,d:3}}, b: 2, c: 3, d: 4, e: 5},
           {e: 5, f: 6, c: 3, a: {a: 1, b: {c: 2, d: 3}}}
           )
    
// { b: 2, d: 4 }

symmetric difference

Symmetric Difference (A ∆ B): create a Arr/obj of all elements which are in A or B but not both.

import {symmetricDifference} from "set-operations";

symmetricDifference([0, 1, 2, 3, 4], [5, 6, 7, 8, 9]);

// [ 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 ]

symmetricDifference(["sun", "rises", "in", "the", "east"], ["sun", "sets", "in", "the", "west"])

// Set [ "rises", "east", "sets", "west" ]

symmetricDifference({a: {a: 1, b: {c: 2,d:3}}, b: 2, c: 3, d: 4, e: 5},
                    {e: 5, f: 6, c: 3, a: {a: 1, b: {c: 2, d: 3}}}
                   )

//{ b: 2, d: 4, f: 6 }

note:for objects, symmetric difference performs difference on A to B and then B to A and puts the elements in to a new object - {...difference(A, B), ...difference(B, A)}, if the keys of elements in both A and B are same then the elements of B replaces elements of A.

symmetricDifference({star:"sun",does:"rises",direction:"east"},
                    {star:"sun", does:"sets",direction:"west"}
                   )

//{does:"sets", direction:"west"});

License

MIT