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#482 - License Key Formatting
Problem Description
You are given a license key represented as a string s that consists of only alphanumeric characters and dashes. The string is separated into n + 1 groups by n dashes. You are also given an integer k.
We want to reformat the string s such that each group contains exactly k characters, except for the first group, which could be shorter than k but still must contain at least one character. Furthermore, there must be a dash inserted between two groups, and you should convert all lowercase letters to uppercase.
Return the reformatted license key.
Solution
/**
* @param {string} s
* @param {number} k
* @return {string}
*/
var licenseKeyFormatting = function(s, k) {
const result = [];
s = s.toUpperCase().replace(/\-+/g, '');
if (s.length % k) {
result.push(s.substring(0, s.length % k));
}
for (let i = s.length % k; i < s.length; i += k) {
result.push(s.substring(i, i + k));
}
return result.join('-');
};