We are required to write a JavaScript function that takes in a string and returns the count of redundant characters in the string.
For example − If the string is −
const str = 'abcde'
Then the output should be 0
If the string is −
const str = 'aaacbfsc';
Then the output should be 3
Example
Following is the code −
const str = 'aaacbfsc'; const countRedundant = str => { let count = 0; for(let i = 0; i < str.length; i++){ if(i === str.lastIndexOf(str[i])){ continue; }; count++; }; return count; }; console.log(countRedundant(str));
Output
Following is the output in the console −
3