From 1e1e70d9a6dbe00583a4a8f538d4786d30309482 Mon Sep 17 00:00:00 2001
From: Stefan Thomas <justmoon@members.fsf.org>
Date: Wed, 14 Aug 2013 17:11:30 -0700
Subject: [PATCH] Add Amount#invert.

---
 src/js/ripple/amount.js | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/src/js/ripple/amount.js b/src/js/ripple/amount.js
index 2f3c671e..441bde90 100644
--- a/src/js/ripple/amount.js
+++ b/src/js/ripple/amount.js
@@ -556,6 +556,21 @@ Amount.prototype.negate = function () {
   return this.clone('NEGATE');
 };
 
+/**
+ * Invert this amount and return the new value.
+ *
+ * Creates a new Amount object as a copy of the current one (including the same
+ * unit (currency & issuer), inverts it (1/x) and returns the result.
+ */
+Amount.prototype.invert = function () {
+  var one = this.clone();
+  one._value = BigInteger.ONE;
+  one._offset = 0;
+  one._is_negative = false;
+  one.canonicalize();
+  return one.ratio_human(this);
+};
+
 /**
  * Tries to correctly interpret an amount as entered by a user.
  *