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1-js/06-advanced-functions/10-bind/head.html

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+<script>
+function mul(a, b) {
+  return a * b;
+};
+
+function ask(question, answer, ok, fail) {
+  let result = prompt(question, '');
+  if (result.toLowerCase() == answer.toLowerCase()) ok();
+  else fail();
+}
+
+function bind(func, context /*, args*/) {
+  let bindArgs = [].slice.call(arguments, 2); // (1)
+  function wrapper() {                        // (2)
+    let args = [].slice.call(arguments);
+    let unshiftArgs = bindArgs.concat(args);  // (3)
+    return func.apply(context, unshiftArgs);  // (4)
+  }
+  return wrapper;
+}
+</script>