reduce array to remove duplicates code example

Example 1: js delete duplicates from array

const names = ['John', 'Paul', 'George', 'Ringo', 'John'];

let unique = [...new Set(names)];
console.log(unique); // 'John', 'Paul', 'George', 'Ringo'

Example 2: javascript filter array remove duplicates

// Using the Set constructor and the spread syntax:

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

Example 3: remove duplicates from array javascript

arr.filter((v,i,a)=>a.findIndex(t=>(t.place === v.place && t.name===v.name))===i)

Example 4: remove duplicate array es6

let a = [10,20,30,10,30];
let b = [... new Set(a)];
console.log(b);