Finding the longest consecutive appearance of a character in another string using JavaScript

Problem

We are required to write a JavaScript function that takes in a string as the first argument and a single character as the second argument.

Our function should count and return the longest consecutive appearance of the the character in the string.

Example

Following is the code −

 Live Demo

const str = 'abcdaaadse'; const char = 'a'; const countChars = (str = '', char = '') => {    const arr = str.split('');    let c = 0, max = 0;    for (let i = 0; i<arr.length ;i++){       if(arr[i] === char){          c+=1          if(c > max){             max = c;          };       }else{          if(c > max){             max = c;          };          c = 0;       };    };    return max; }; console.log(countChars(str, char));

Output

3