Question

How to move all special characters to the beginning of a string in JavaScript

Answer 1

function move_special_characters_to_beginning(s) {
    const len = s.length; 
    let chars = "";
    let pecial_characters = ""; 
            
    for (let i = 0; i < len; i++) { 
         ch = s[i]; 
         const alphanumeric = /^[0-9a-zA-Z]+$/;
                  
         if (ch.match(alphanumeric)) {
            chars = chars + ch; 
         }
         else {
            pecial_characters = pecial_characters + ch; 
         }
    } 
    
    return pecial_characters + chars; 
} 
 
 
const s = "c++14$c&^java*(rust) php <>/python 3.14.2"; 
  
console.log(move_special_characters_to_beginning(s));

  
   
/*
run:
    
++$&^*()  <>/ ..c14cjavarustphppython3142
       
*/

 

70+ SQL courses for beginners and professionals

Answer 2

function moveSpecialCharactersToBeginning(s) {
  let specials = "";
  let chars = "";

  for (let ch of s) {
    if (/[a-zA-Z0-9\s]/.test(ch)) {
      chars += ch;
    } else {
      specials += ch;
    }
  }

  return specials + chars;
}

const s = "c++20$c&^java*(rust) php <>/python 3.14.2";

console.log(moveSpecialCharactersToBeginning(s));



/*
run:

++$&^*()<>/..c20cjavarust php python 3142

*/

 

70+ SQL courses for beginners and professionals