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Number of non-unique characters in a string in JavaScript
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
The code for this will be −
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
The output in the console will be −
3
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