Test migration to jest by hand

Apparently using regular expressions is way easier.

test/toCamelCase/toCamelCase.js

@@ -0,0 +1,10 @@
+const toCamelCase = str => {
+let s =
+str &&
+str
+.match(/[A-Z]{2,}(?=[A-Z][a-z]+[0-9]*|\b)|[A-Z]?[a-z]+[0-9]*|[A-Z]|[0-9]+/g)
+.map(x => x.slice(0, 1).toUpperCase() + x.slice(1).toLowerCase())
+.join('');
+return s.slice(0, 1).toLowerCase() + s.slice(1);
+};
+module.exports = toCamelCase;