count occurrences of char in string javascript code example

Example 1: how do i count the number of occurrences in a string javascript

function charCount(myChar, str) {
	let count = 0;

	for (let i = 0; i < str.length; i++) 
    if (str.charAt(i) == myChar) 
        count++
 return count;
}

Example 2: count value a to b character javascript

function count (string) {  
  var count = {};
  string.split('').forEach(function(s) {
     count[s] ? count[s]++ : count[s] = 1;
  });
  return count;
}