Stolen Lunch
Description
When you recently visited your little nephew, he told you a sad story: there’s a bully at school who steals his lunch every day, and locks it away in his locker. He also leaves a note with a strange, coded message. Your nephew gave you one of the notes in hope that you can decipher it for him. And you did: it looks like all the digits in it are replaced with letters and vice versa. Digit 0 is replaced with 'a', 1 is replaced with 'b' and so on, with digit 9 replaced by 'j'.
The note is different every day, so you decide to write a function that will decipher it for your nephew on an ongoing basis.
Example
For note = "you'll n4v4r 6u4ss 8t: cdja", the output should be
stolenLunch(note) = "you'll never guess it: 2390".
Input/Output
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[execution time limit] 4 seconds (js)
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[input] string note
A string consisting of lowercase English letters, digits, punctuation marks and whitespace characters (
' ').Guaranteed constraints:
0 ≤ note.length ≤ 500. -
[output] string
- The deciphered
note.
- The deciphered
[JavaScript (ES6)] Syntax Tips
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// Prints help message to the console
// Returns a string
function helloWorld(name) {
console.log("This prints to the console when you Run Tests");
return "Hello, " + name;
}
Solution
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function stolenLunch(note) {
return note.replace(/\d|[a-j]/g, function (char) {
if (char >= "a" && char <= "j") {
return String.fromCharCode(char.charCodeAt(0) - 'a'.charCodeAt(0) + '0'.charCodeAt(0));
} else {
return String.fromCharCode(char.charCodeAt(0) - '0'.charCodeAt(0) + 'a'.charCodeAt(0));
}
});
}