Question

How to get only the unique elements of array in Node.js

Answer 1

const arr = [6, 7, 2, 8, 2, 5, 5, 8, 7, 8, 3, 2, 8, 8, 2, 8]

const map = arr.reduce((acc, el) => acc.set(el, (acc.get(el) || 0) + 1), new Map());

console.log([...map.keys()]) 
 
 
 
 
/*
run:
 
[ 6, 7, 2, 8, 5, 3 ]
 
*/

 

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Answer 2

const arr = [6, 7, 2, 8, 2, 5, 5, 8, 7, 8, 3, 2, 8, 8, 2, 8]

const unique = [...new Set(arr)]
 
console.log(unique);
 
 
 
 
/*
run:
 
[ 6, 7, 2, 8, 5, 3 ]
 
*/

 

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