We are required to write a JavaScript function that takes in a string and changes every letter of the string from the English alphabets to its succeeding element.
For example: If the string is −
const str = 'how are you';
Output
Then the output should be −
const output = 'ipx bsf zpv'
Therefore, let’s write the code for this function −
Example
The code for this will be −
const str = 'how are you'; const isAlpha = code => (code >= 65 && code <= 90) || (code >= 97 && code <= 122); const isLast = code => code === 90 || code === 122; const nextLetterString = str => { const strArr = str.split(''); return strArr.reduce((acc, val) => { const code = val.charCodeAt(0); if(!isAlpha(code)){ return acc+val; }; if(isLast(code)){ return acc+String.fromCharCode(code-25); }; return acc+String.fromCharCode(code+1); }, ''); }; console.log(nextLetterString(str));
The output in the console will be −
ipx bsf zpv