add hw2

node_modules/ramda/es/invoker.js

@@ -0,0 +1,54 @@
+import _curry2 from "./internal/_curry2.js";
+import _isFunction from "./internal/_isFunction.js";
+import curryN from "./curryN.js";
+import toString from "./toString.js";
+/**
+ * Turns a named method with a specified arity into a function that can be
+ * called directly supplied with arguments and a target object.
+ *
+ * The returned function is curried and accepts `arity + 1` parameters where
+ * the final parameter is the target object.
+ *
+ * @func
+ * @memberOf R
+ * @since v0.1.0
+ * @category Function
+ * @sig Number -> String -> (a -> b -> ... -> n -> Object -> *)
+ * @param {Number} arity Number of arguments the returned function should take
+ *        before the target object.
+ * @param {String} method Name of any of the target object's methods to call.
+ * @return {Function} A new curried function.
+ * @see R.construct
+ * @example
+ *
+ *      const sliceFrom = R.invoker(1, 'slice');
+ *      sliceFrom(6, 'abcdefghijklm'); //=> 'ghijklm'
+ *      const sliceFrom6 = R.invoker(2, 'slice')(6);
+ *      sliceFrom6(8, 'abcdefghijklm'); //=> 'gh'
+ *
+ *      const dog = {
+ *        speak: async () => 'Woof!'
+ *      };
+ *      const speak = R.invoker(0, 'speak');
+ *      speak(dog).then(console.log) //~> 'Woof!'
+ *
+ * @symb R.invoker(0, 'method')(o) = o['method']()
+ * @symb R.invoker(1, 'method')(a, o) = o['method'](a)
+ * @symb R.invoker(2, 'method')(a, b, o) = o['method'](a, b)
+ */
+
+var invoker =
+/*#__PURE__*/
+_curry2(function invoker(arity, method) {
+  return curryN(arity + 1, function () {
+    var target = arguments[arity];
+
+    if (target != null && _isFunction(target[method])) {
+      return target[method].apply(target, Array.prototype.slice.call(arguments, 0, arity));
+    }
+
+    throw new TypeError(toString(target) + ' does not have a method named "' + method + '"');
+  });
+});
+
+export default invoker;