Array Deduplication

ArrayDeduplication.js

array.filter(function (item, position) {
  return array.indexOf(item) == position
})

UseForeach.js

const uniqueArray = []
array.forEach(n => {
  uniqueArray.indexOf(n) === -1 && uniqueArray.push(n)
})

UseMapKey.js

let map = null
const uniqueArray = []
map = array.reduce((map, val) => {
  map[val] = null
  return map
}, new Map())
for (let key in map) {
  uniqueArray.push(key)
}

UseReduce.js

// De-duplication
array.reduce((a, val) => {
  a.indexOf(val) === -1 && a.push(val)
  return a
}, [])

UseSort.js

const uniqueArray = [...new Set(array)]