JavaScript | Counts the frequency | four different ways

Here are four different ways to write a function that counts the frequency of each value in an object:

1. Using a for...in loop:

function countFrequency1(obj) {
  const frequency = {};
  
  for (let key in obj) {
    const value = obj[key];
    frequency[value] = (frequency[value] || 0) + 1;
  }
  
  return frequency;
}

2. Using Object.keys() and forEach():

function countFrequency2(obj) {
  const frequency = {};
  
  Object.keys(obj).forEach(key => {
    const value = obj[key];
    frequency[value] = (frequency[value] || 0) + 1;
  });
  
  return frequency;
}

3. Using Object.values() and forEach():

function countFrequency3(obj) {
  const frequency = {};
  
  Object.values(obj).forEach(value => {
    frequency[value] = (frequency[value] || 0) + 1;
  });
  
  return frequency;
}

4. Using Object.entries() and forEach():

function countFrequency4(obj) {
  const frequency = {};
  
  Object.entries(obj).forEach(([key, value]) => {
    frequency[value] = (frequency[value] || 0) + 1;
  });
  
  return frequency;
}

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