Question

How to swap pairs of characters in a string with JavaScript

Answer 1

function SwapPairs(str) {
    if (str == null || (str.length === 0)) {
        return str;
    }
     
    let arr = str.split('');
     
    for (let i = 0; i < arr.length - 1; i += 2) {
        let tmp = arr[i];
        arr[i] = arr[i + 1];
        arr[i + 1] = tmp;
    }
     
    return arr.join("");
}
 
const str = "aBcDeFgHiJkL";
     
console.log(SwapPairs(str));
 
 
 
 
/*
run:
 
"BaDcFeHgJiLk"
 
*/

 

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