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node_modules/indefinite/lib/helpers.js

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+const STARTS_WITH_VOWEL = /^[aeiouAEIOU]/;
+
+/**
+ * Array#indexOf is faster IF the word starts with "a" (for example),
+ * but negligibly faster when you have to .toLowerCase() the word, and
+ * slower if the word happens to start with (e.g.) "u."
+ */
+exports.startsWithVowel = word => STARTS_WITH_VOWEL.test(word);
+
+exports.capitalize = (article, opts) => {
+  if (opts.capitalize) {
+    article = `${article.charAt(0).toUpperCase()}${article.slice(1)}`;
+  }
+
+  return article;
+};