src/capitalize.js
thoward37@gmail.com/shirt[create-new-file-src-capitalize-js] / src / capitalize.js
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+/**
+ * Capitalizes the first character of a string.
+ *
+ * @param {string} s - The string to capitalize.
+ * @returns {string} - The capitalized string.
+ * @throws {TypeError} - If the input is not a string.
+ */
+export function capitalize(s) {
+ if (typeof s !== 'string') {
+ throw new TypeError('Input must be a string');
+ }
+ if (s.length === 0) {
+ return s;
+ }
+ return s[0].toUpperCase() + s.slice(1);
+}