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Algorithms

Using array.reduce method to count duplicate elements

seoca 2022. 10. 23. 14:27

 

const alphabets = [1,1,1,2,3,3,1,4,5];
const counts = alphabets.reduce((acc, current) => {
    if(acc[current]){
        acc[current] += 1;
    } else {
        acc[current] = 1;
    }
    return acc;
}, {});

console.log(counts); //{ '1': 4, '2': 1, '3': 2, '4': 1, '5': 1 }
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