"Not correcly chosen" should be clarified.
ES6
const alphabet = "abcdefghijklmnopqrstuvwxyz" const decode = (encoded) => { let number = parseInt(encoded.split(/\D/)[0]) let text = encoded.substring(("" + number).length) let result = "" for(let i=0;i<text.length;i++) { let encodedIndex = alphabet.indexOf(text[i]) for(let j=0;j<26;j++) { if((j*number - encodedIndex) % 26 === 0) { result += alphabet[j] break; } } } return result; }
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"Not correcly chosen" should be clarified.
ES6