filter duplicate elements from an array code example

Example 1: javascript filter array remove duplicates

// Using the Set constructor and the spread syntax:

arrayWithOnlyUniques = [...new Set(arrayWithDuplicates)]

Example 2: remove duplicates from array

let chars = ['A', 'B', 'A', 'C', 'B'];
let uniqueChars = [...new Set(chars)];

console.log(uniqueChars);

output:
[ 'A', 'B', 'C' ]

Example 3: remove duplicates array.filter

// removeDuplicates ES6
const uniqueArray = oldArray.filter((item, index, self) => self.indexOf(item) === index);