1 files changed, 54 insertions, 0 deletions
diff --git a/javascript/videojs/src/js/utils/str.js b/javascript/videojs/src/js/utils/str.js
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+++ b/javascript/videojs/src/js/utils/str.js
@@ -0,0 +1,54 @@
+/**
+ * @file str.js
+ * @module to-lower-case
+ */
+
+/**
+ * Lowercase the first letter of a string.
+ *
+ * @param {string} string
+ *        String to be lowercased
+ *
+ * @return {string}
+ *         The string with a lowercased first letter
+ */
+export const toLowerCase = function(string) {
+  if (typeof string !== 'string') {
+    return string;
+  }
+
+  return string.replace(/./, (w) => w.toLowerCase());
+};
+
+/**
+ * Uppercase the first letter of a string.
+ *
+ * @param {string} string
+ *        String to be uppercased
+ *
+ * @return {string}
+ *         The string with an uppercased first letter
+ */
+export const toTitleCase = function(string) {
+  if (typeof string !== 'string') {
+    return string;
+  }
+
+  return string.replace(/./, (w) => w.toUpperCase());
+};
+
+/**
+ * Compares the TitleCase versions of the two strings for equality.
+ *
+ * @param {string} str1
+ *        The first string to compare
+ *
+ * @param {string} str2
+ *        The second string to compare
+ *
+ * @return {boolean}
+ *         Whether the TitleCase versions of the strings are equal
+ */
+export const titleCaseEquals = function(str1, str2) {
+  return toTitleCase(str1) === toTitleCase(str2);
+};