Question

How to find and print the common characters (letters) in different strings with JavaScript

Answer 1

function getCommonCharacters(str1, str2) {
    let strcommon = "";
    
    for (let i in str1) {
        if (str2.includes(str1[i])) {
            if (! strcommon.includes(str1[i])) {
                strcommon += str1[i];
            }
        }
    }
    
    return strcommon;
}

const str1 = "c c++ c# java go";
const str2 = "python nodejs php javascript";

let strcommon = getCommonCharacters(str1, str2);

console.log("Same letters are: " + strcommon);



 
/*
run:
  
Same letters are: c javo
  
*/

 

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Answer 2

function getCommonCharacters(str1, str2) {
    let set1 = new Set(str1);
    let set2 = new Set(str2);
    
    let strcommon = new Set([...set1].filter(x => set2.has(x)));
     
    return [...strcommon].join('');;
}
 
const str1 = "c c++ c# java go";
const str2 = "python nodejs php javascript";
 
let strcommon = getCommonCharacters(str1, str2);
 
console.log("Same letters are: " + strcommon);
 
 
 
  
/*
run:
   
Same letters are: c javo
   
*/

 

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