lib/index.js: cache PIN_DEFS.length in PIN_DEFS_LENGTH

Signed-off-by: Rick Waldron <waldron.rick@gmail.com>
rwaldron · Jun 23, 2017 · 39bc0a6 · 39bc0a6
1 parent 2e7ef8c
commit 39bc0a6
Showing 1 changed file with 3 additions and 3 deletions.
diff --git a/lib/index.js b/lib/index.js
@@ -111,6 +111,7 @@ PIN_DEFS.forEach(def => {
   }
 });
 
+const PIN_DEFS_LENGTH = PIN_DEFS.length;
 const PIN_DATA_POOL = Array.from({ length: 20 }, _ => Object.create(null));
 
 const A = "A";
@@ -169,7 +170,6 @@ const SERVO_MAX = 0.12;
 
 const ADC_RESOLUTION = 4096;
 
-
 /**
  * ToPinIndex Return the board-wide index of a Pin for a given Pin name, Number, or Index
  * @param {number} value The index of a pin across port A and B (0-15)
@@ -182,7 +182,7 @@ function ToPinIndex(value) {
   }
 
   if (!Number.isNaN(index)) {
-    if (index >= 0 && index < PIN_DEFS.length) {
+    if (index >= 0 && index < PIN_DEFS_LENGTH) {
       return index;
     } else {
       return -1;
@@ -220,7 +220,7 @@ function ToPortIdentity(index) {
   index = +index;
   const port = PORTS.BY_NUMBER[index >> 3];
 
-  if ((index < 0 || index >= PIN_DEFS.length) ||
+  if ((index < 0 || index >= PIN_DEFS_LENGTH) ||
       port === undefined || PIN_DEFS[index] === undefined) {
     return ToPortIdentity.cache.null;
   }