Add TitleCase Typescript Schnippet

This allows you to convert a string to titlecase.

typescript_utils/title-case.ts

@@ -0,0 +1,89 @@
+// Standalone function
+export const toTitleCase = function(str: string): string {
+  str = str.replace(/([^\W_]+[^\s-]*) */g, function(txt) {
+    return txt.charAt(0).toUpperCase() + txt.substr(1).toLowerCase();
+  });
+
+  // Certain minor words should be left lowercase unless
+  // they are the first or last words in the string
+  const lowers = [
+    'A',
+    'An',
+    'And',
+    'As',
+    'At',
+    'But',
+    'By',
+    'For',
+    'From',
+    'In',
+    'Into',
+    'Is',
+    'Near',
+    'Nor',
+    'Of',
+    'On',
+    'Onto',
+    'Or',
+    'The',
+    'To',
+    'With',
+  ];
+  const uppers = ['Id', 'Tv'];
+
+  for (let i = 0; i < lowers.length; i++)
+    str = str.replace(new RegExp('\\s' + lowers[i] + '\\s', 'g'), function(txt) {
+      return txt.toLowerCase();
+    });
+
+  // Certain words such as initialisms or acronyms should be left uppercase
+  for (let i = 0; i < uppers.length; i++)
+    str = str.replace(new RegExp('\\b' + uppers[i] + '\\b', 'g'), uppers[i].toUpperCase());
+
+  return str;
+};
+
+// Prototype onto String so any string gets "".toTitleCase()
+String.prototype.toTitleCase = function() {
+  let str = this.replace(/([^\W_]+[^\s-]*) */g, function(txt) {
+    return txt.charAt(0).toUpperCase() + txt.substr(1).toLowerCase();
+  });
+
+  // Certain minor words should be left lowercase unless
+  // they are the first or last words in the string
+  const lowers = [
+    'A',
+    'An',
+    'And',
+    'As',
+    'At',
+    'But',
+    'By',
+    'For',
+    'From',
+    'In',
+    'Into',
+    'Is',
+    'Near',
+    'Nor',
+    'Of',
+    'On',
+    'Onto',
+    'Or',
+    'The',
+    'To',
+    'With',
+  ];
+  const uppers = ['Id', 'Tv'];
+
+  for (let i = 0; i < lowers.length; i++)
+    str = str.replace(new RegExp('\\s' + lowers[i] + '\\s', 'g'), function(txt) {
+      return txt.toLowerCase();
+    });
+
+  // Certain words such as initialisms or acronyms should be left uppercase
+  for (let i = 0; i < uppers.length; i++)
+    str = str.replace(new RegExp('\\b' + uppers[i] + '\\b', 'g'), uppers[i].toUpperCase());
+
+  return str;
+};