Bump to v4.0.0.

fromPairs.js

@@ -0,0 +1,29 @@
+var baseSet = require('./internal/baseSet');
+
+/**
+ * The inverse of `_.toPairs`; this method returns an object composed
+ * from key-value `pairs`.
+ *
+ * @static
+ * @memberOf _
+ * @category Array
+ * @param {Array} pairs The key-value pairs.
+ * @returns {Object} Returns the new object.
+ * @example
+ *
+ * _.fromPairs([['fred', 30], ['barney', 40]]);
+ * // => { 'fred': 30, 'barney': 40 }
+ */
+function fromPairs(pairs) {
+  var index = -1,
+      length = pairs ? pairs.length : 0,
+      result = {};
+
+  while (++index < length) {
+    var pair = pairs[index];
+    baseSet(result, pair[0], pair[1]);
+  }
+  return result;
+}
+
+module.exports = fromPairs;