add hw2

node_modules/ramda/es/internal/_objectIs.js

@@ -0,0 +1,14 @@
+// Based on https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/is
+function _objectIs(a, b) {
+  // SameValue algorithm
+  if (a === b) {
+    // Steps 1-5, 7-10
+    // Steps 6.b-6.e: +0 != -0
+    return a !== 0 || 1 / a === 1 / b;
+  } else {
+    // Step 6.a: NaN == NaN
+    return a !== a && b !== b;
+  }
+}
+
+export default typeof Object.is === 'function' ? Object.is : _objectIs;