Question

How to reverse string without temporary variable in TypeScript

Answer 1

function ReverseStringWithoutTemporaryVariable(str: string) {
    let start: number = 0, end: number = str.length - 1; 
    let array:string[] = str.split("");

    while (start < end) {
        // XOR used to swap two variables
        array[start] = String.fromCharCode(array[start].charCodeAt(0) ^ array[end].charCodeAt(0));
        array[end] = String.fromCharCode(array[end].charCodeAt(0) ^ array[start].charCodeAt(0));
        array[start] = String.fromCharCode(array[start].charCodeAt(0) ^ array[end].charCodeAt(0));
        start++;
        end--;
    }

    return array.join("");
}
  
let str: string = "typescript c++ c";

str = ReverseStringWithoutTemporaryVariable(str);

console.log(str);




/*
run:

"c ++c tpircsepyt" 

*/

 

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