feat: impliment isAscii

ariporad · Jan 6, 2016 · 6b86fda · 6b86fda
1 parent bec7a75
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diff --git a/index.js b/index.js
@@ -0,0 +1,13 @@
+/* (c) 2016 Ari Porad (@ariporad) <http://ariporad.com>. License: ariporad.mit-license.org */
+
+// Partially from http://stackoverflow.com/a/94049/1928484, and from another SO answer, which told me that the highest
+// char code that's ascii is 127, but I can't find the link for. Sorry.
+
+var MAX_ASCII_CHAR_CODE = 127;
+
+module.exports = function isAscii(str) {
+  for (var i = 0, strLen = str.length; i < strLen; ++i) {
+    if (str.charCodeAt(i) > MAX_ASCII_CHAR_CODE) return false;
+  }
+  return true;
+};
diff --git a/test.js b/test.js
@@ -0,0 +1,11 @@
+/* (c) 2016 Ari Porad (@ariporad) <http://ariporad.com>. License: ariporad.mit-license.org */
+import test from 'ava';
+import isAscii from './index';
+
+test('ascii strings', t => {
+  t.is(isAscii('foo'), true);
+});
+
+test('non-ascii strings', t => {
+  t.is(isAscii('‽‽‽'), false);
+});