unique-by-set

Use Set and Map to create a new Array without duplicates

• Preserves an Objects methods
• Works on mixed Arrays [Object, Array, Number, String]
• Works on JSON

params: originalArray Array you want to remove duplicates from

returns: a new Array with no duplicates

Install

yarn add unique-by-set

Implementation

const uniqueBySet = require('unique-by-set')

Strings

strings is an Array of Strings

Remove all duplicate Stings in strings

let strings = ['a', 'b', 'c', 'c', 'd', 'd', 'a']

let uniqueStings = uniqueBySet(strings)

console.log(uniqueStings)

[ 'a', 'b', 'c', 'd' ]

Numbers

nums is an Array of Numbers

remove all duplicate Numbers in nums

let numbers = [0, 1, 2, 2, 3, 4]

let uniqueNumbers = uniqueBySet(numbers)

console.log(uniqueNumbers)

[ 0, 1, 2, 3, 4 ]

Arrays

arrays is an Array of Arrays

remove all duplicate Arrays in arrays

let arrays = [
  [1, 0],
  [1, 1],
  [1, 2],
  [1, 3],
  [1, 3],
  [1, 4],
  [1, 2],
  [1, 2],
]

let uniqueArrays = uniqueBySet(arrays)

console.log(uniqueArrays)

[
  [1, 0],
  [1, 1],
  [1, 2],
  [1, 3],
  [1, 4],
]

JavaScript Objects

users is an Array of JavaScript Objects

remove all duplicate Objects in users

let users = [
  {
    id: 0,
    email: '[email protected]',
    mobile: '111-111-1111',
    social: {
      instagram: 'salsa_flavio',
    },
    get: {
      preferences: () => {
        return 0
      },
    },
  },
  {
    id: 0,
    email: '[email protected]',
    mobile: '111-111-1111',
    social: {
      instagram: 'salsa_flavio',
    },
    get: {
      preferences: () => {
        return 0
      },
    },
  },
  {
    id: 1,
    email: '[email protected]',
    mobile: '222-222-2222',
    social: {
      instagram: 'salsa_flavio',
    },
    get: {
      preferences: () => {
        return 1
      },
    },
  },
  {
    id: 2,
    email: '[email protected]',
    mobile: '222-222-2222',
    social: {
      instagram: 'salsa_flavio',
    },
    get: {
      preferences: () => {
        return 2
      },
    },
  },
  {
    id: 2,
    email: '[email protected]',
    mobile: '222-222-2222',
    social: {
      instagram: 'salsa_flavio',
    },
    get: {
      preferences: () => {
        return 2
      },
    },
  },
]

let uniqueUsers = uniqueBySet(users)

console.log(uniqueUsers)

[
  {
    id: 0,
    email: '[email protected]',
    mobile: '111-111-1111',
    social: { instagram: 'salsa_flavio' },
    get: { preferences: [(λ: preferences)] },
  },
  {
    id: 1,
    email: '[email protected]',
    mobile: '222-222-2222',
    social: { instagram: 'salsa_flavio' },
    get: { preferences: [(λ: preferences)] },
  },
  {
    id: 2,
    email: '[email protected]',
    mobile: '222-222-2222',
    social: { instagram: 'salsa_flavio' },
    get: { preferences: [(λ: preferences)] },
  },
]

Mixed

mixed is an Array of Strings, Numbers and JavaScript Objects

remove all duplicate elements in mixed

let mixed = [
  {
    id: 111,
    name: 'Flavio',
    get: {
      preferences: (id) => {
        return id
      },
    },
  },
  {
    id: 222,
    name: 'Jorge',
    get: {
      preferences: (id) => {
        return id
      },
    },
  },
  'Apple',
  'Adobe',
  'Flavio is Awesome',
  'Jorge is Disco',
  {
    id: 111,
    name: 'Flavio',
    get: {
      preferences: (id) => {
        return id
      },
    },
  },
  'Apple',
  'Adobe',
]

let uniqueMixed = uniqueBySet(mixed)

console.log(uniqueMixed)

[
  { id: 111,
    name: 'Flavio',
    get: { preferences: [λ: preferences] }
  },
  { id: 222,
    name: 'Jorge',
    get: { preferences: [λ: preferences] }
  },
  'Apple',
  'Adobe',
  'Flavio is Awesome',
  'Jorge is Disco'
]