js string limit length

1string.substring(0,lengthRequired+1);

1String.prototype.trimEllip = function (length) {
2  return this.length > length ? this.substring(0, length) + "..." : this;
3}

1const getMaxLetter = (str) => {
2  let max = 0;
3  let maxChar = '';
4  str.split('').forEach((char) => {
5    if (str.split(char).length > max) {
6      max = str.split(char).length - 1;
7      maxChar = char;
8    }
9  });
10  return `The max letter is : ${maxChar} and the max number of times it is seen is: ${max} times`;
11};