Question

How to count frequency of each element in an array in JavaScript

Answer 1

const arr = [4, 1, 2, 8, 9, 5, 5, 1, 7, 8, 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: 1,
  4: 1,
  5: 2,
  7: 1,
  8: 3,
  9: 1
}
        
*/

 

70+ SQL courses for beginners and professionals