--- /dev/null
+var makeString = require('./helper/makeString');
+var toPositive = require('./helper/toPositive');
+
+module.exports = function startsWith(str, starts, position) {
+ str = makeString(str);
+ starts = '' + starts;
+ position = position == null ? 0 : Math.min(toPositive(position), str.length);
+ return str.lastIndexOf(starts, position) === position;
+};