Removing punctuations from a string using JavaScript

Problem

We are required to write a JavaScript function that takes in a string and removes all special characters from the string leaving behind just alphabets and numerals in the resultant string.

Input

const str = 'th@is Str!ing Contains 3% punctuations';

Output

const output = 'thisStringContains3punctuations';

Because we removed all punctuations and whitespaces

Example

Following is the code −

 Live Demo

const str = 'th@is Str!ing Contains 3% punctuations';
const removeSpecialChars = (str = '') => {
   let res = '';
   for(let i = 0; i < str.length; i++){
      const el = str[i];
   if(+el){
      res += el;
      }else if(el.toLowerCase() !== el.toUpperCase()){
         res += el;
      };
      continue;
   };
   return res;
};
console.log(removeSpecialChars(str));

Output

thisStringContains3punctuations