From: Scott Worley <scottworley@scottworley.com>
Date: Thu, 23 May 2019 21:39:08 +0000 (-0700)
Subject: Bounds are closed intervals
X-Git-Tag: v1.0~11
X-Git-Url: http://git.scottworley.com/inverse-tax/commitdiff_plain/68251a4c105d8c693061b044d45468184232f35c?hp=b442070b44917301d40c5a6cbf996898175908be

Bounds are closed intervals
---

diff --git a/tax.js b/tax.js
index cd0027a..f3d2406 100644
--- a/tax.js
+++ b/tax.js
@@ -84,7 +84,7 @@ function invert(table) {
   });
   return function(net) {
     for (const [start, end, m, b] of inverse_table) {
-      if (start < net && net < end) {
+      if (start <= net && net <= end) {
         return (net - b) / m;
       }
     }
diff --git a/tax.test.js b/tax.test.js
index 27767fe..58995ef 100644
--- a/tax.test.js
+++ b/tax.test.js
@@ -60,4 +60,5 @@ test("invert", () => {
   assert.strictEqual(invert([[10, Infinity, .1]])( 9),  9);
   assert.strictEqual(invert([[0, 100, .1], [100, Infinity, .2]])(170), 200);
   assert.strictEqual(invert([[0, 100, .1], [100, Infinity, .2]])(112), 127.5);
+  assert.strictEqual(invert([[6, 90, 0.75], [90, Infinity, 0.12]])(27), 90);
 });