add hw2

node_modules/lodash-es/fromPairs.js

@@ -0,0 +1,28 @@
+/**
+ * The inverse of `_.toPairs`; this method returns an object composed
+ * from key-value `pairs`.
+ *
+ * @static
+ * @memberOf _
+ * @since 4.0.0
+ * @category Array
+ * @param {Array} pairs The key-value pairs.
+ * @returns {Object} Returns the new object.
+ * @example
+ *
+ * _.fromPairs([['a', 1], ['b', 2]]);
+ * // => { 'a': 1, 'b': 2 }
+ */
+function fromPairs(pairs) {
+  var index = -1,
+      length = pairs == null ? 0 : pairs.length,
+      result = {};
+
+  while (++index < length) {
+    var pair = pairs[index];
+    result[pair[0]] = pair[1];
+  }
+  return result;
+}
+
+export default fromPairs;