Question

How to count frequency of each element in an array in Node.js

Answer 1

const arr = [4, 1, 2, 8, 9, 5, 2, 2, 2, 5, 1, 7, 8, 2, 8];
        
const count = {};

for (const element of arr) {
  if (count[element]) {
    count[element] += 1;
  } else {
    count[element] = 1;
  }
}

console.log(count);  

      
      
      
/*
run:
      
{ '1': 2, '2': 5, '4': 1, '5': 2, '7': 1, '8': 3, '9': 1 }
        
*/

 

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