JAVASCRIPT

Remove duplicate items form array using reduce() method.

const names = [
	'shibu',
	'neymar',
	'vinicius',
	'pattinson',
	'ronaldo',
	'shibu',
	'neymar',
	'pattinson',
	'diCaprio'
];

let onlyName = names.reduce((accumulator, currentValue) => {
	if (accumulator.indexOf(currentValue) === -1) {
		accumulator.push(currentValue);
	}
	return accumulator;
}, []);

console.log(onlyName);

//Expected result => ['shibu', 'neymar', 'vinicius', 'pattinson', 'ronaldo', 'diCaprio'

Remove duplicates from arrays using reduce

var numbers = [1, 1, 2, 3, 4, 4];

function unique(array){
  return array.reduce(function(previous, current) {
     if(!previous.find(function(prevItem){
         return prevItem === current;
     })) {
        previous.push(current);
     }
     return previous;
 }, []);
}

unique(numbers);