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Decrypting source message from a code based on some algorithm in JavaScript
Problem
We are required to write a JavaScript function that takes in a decrypted message and returns its source message.
All we know is the algorithm used to encrypt that message.
And the algorithm is −
- Reverse the message string.
- Replace every letter with its ASCII code in quotes (A to '65', h to '104' and so on).
- Insert digits and spaces as is.
Example
Following is the code −
const str = '12 hello world 30';
const decryptString = (str = '') => {
const alpha = 'abcdefghijklmnopqrstuvwxyz';
let res = '';
for(let i = str.length - 1; i >= 0; i--){
const el = str[i];
if(alpha.includes(el.toLowerCase())){
res += `'${el.charCodeAt(0)}'`;
}else{
res += el;
};
};
return res;
};
console.log(decryptString(str));Output
Following is the console output −
03 '100''108''114''111''119' '111''108''108''101''104' 21
Updated on: 19-Apr-2021
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