Question

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

Answer 1

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

 

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