delete duplicates array javascript 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: prevent duplicate entries in javascript array

if (array.indexOf(value) === -1) array.push(value);

Example 3: remove duplicates in array

uniq = [...new Set(array)];

or 

uniqueArray = a.filter(function(item, pos) {
    return a.indexOf(item) == pos;
})

Example 4: array remove duplicates javascript

uniq = [...new Set(array)];