From 944a44c8dae9af0602594d18baf2552dcac4a4ac Mon Sep 17 00:00:00 2001
From: Rohit Paul <113459757+RohitPaul12345@users.noreply.github.com>
Date: Wed, 2 Aug 2023 17:33:00 +0530
Subject: [PATCH] Update hand.js

---
 lib/hand.js | 26 +++++++++++++-------------
 1 file changed, 13 insertions(+), 13 deletions(-)

diff --git a/lib/hand.js b/lib/hand.js
index f77a1ba..57fd678 100644
--- a/lib/hand.js
+++ b/lib/hand.js
@@ -1,4 +1,4 @@
-var Pointable = require("./pointable")
+let Pointable = require("./pointable")
   , Bone = require('./bone')
   , glMatrix = require("gl-matrix")
   , mat3 = glMatrix.mat3
@@ -25,7 +25,7 @@ var Pointable = require("./pointable")
  * A Hand object created from the Hand constructor is also invalid.
  * Test for validity with the [Hand.valid]{@link Leap.Hand#valid} property.
  */
-var Hand = module.exports = function(data) {
+let Hand = module.exports = function(data) {
   /**
    * A unique ID assigned to this Hand object, whose value remains the same
    * across consecutive frames while the tracked hand remains visible. If
@@ -209,7 +209,7 @@ var Hand = module.exports = function(data) {
  * invalid Finger object is returned.
  */
 Hand.prototype.finger = function(id) {
-  var finger = this.frame.finger(id);
+  let finger = this.frame.finger(id);
   return (finger && (finger.handId == this.id)) ? finger : Pointable.Invalid;
 }
 
@@ -235,14 +235,14 @@ Hand.prototype.finger = function(id) {
  */
 Hand.prototype.rotationAngle = function(sinceFrame, axis) {
   if (!this.valid || !sinceFrame.valid) return 0.0;
-  var sinceHand = sinceFrame.hand(this.id);
+  let sinceHand = sinceFrame.hand(this.id);
   if(!sinceHand.valid) return 0.0;
-  var rot = this.rotationMatrix(sinceFrame);
-  var cs = (rot[0] + rot[4] + rot[8] - 1.0)*0.5
-  var angle = Math.acos(cs);
+  let rot = this.rotationMatrix(sinceFrame);
+  let cs = (rot[0] + rot[4] + rot[8] - 1.0)*0.5
+  let angle = Math.acos(cs);
   angle = isNaN(angle) ? 0.0 : angle;
   if (axis !== undefined) {
-    var rotAxis = this.rotationAxis(sinceFrame);
+    let rotAxis = this.rotationAxis(sinceFrame);
     angle *= vec3.dot(rotAxis, vec3.normalize(vec3.create(), axis));
   }
   return angle;
@@ -265,7 +265,7 @@ Hand.prototype.rotationAngle = function(sinceFrame, axis) {
  */
 Hand.prototype.rotationAxis = function(sinceFrame) {
   if (!this.valid || !sinceFrame.valid) return vec3.create();
-  var sinceHand = sinceFrame.hand(this.id);
+  let sinceHand = sinceFrame.hand(this.id);
   if (!sinceHand.valid) return vec3.create();
   return vec3.normalize(vec3.create(), [
     this._rotation[7] - sinceHand._rotation[5],
@@ -291,10 +291,10 @@ Hand.prototype.rotationAxis = function(sinceFrame) {
  */
 Hand.prototype.rotationMatrix = function(sinceFrame) {
   if (!this.valid || !sinceFrame.valid) return mat3.create();
-  var sinceHand = sinceFrame.hand(this.id);
+  let sinceHand = sinceFrame.hand(this.id);
   if(!sinceHand.valid) return mat3.create();
-  var transpose = mat3.transpose(mat3.create(), this._rotation);
-  var m = mat3.multiply(mat3.create(), sinceHand._rotation, transpose);
+  let transpose = mat3.transpose(mat3.create(), this._rotation);
+  let m = mat3.multiply(mat3.create(), sinceHand._rotation, transpose);
   return m;
 }
 
@@ -341,7 +341,7 @@ Hand.prototype.scaleFactor = function(sinceFrame) {
  */
 Hand.prototype.translation = function(sinceFrame) {
   if (!this.valid || !sinceFrame.valid) return vec3.create();
-  var sinceHand = sinceFrame.hand(this.id);
+  let sinceHand = sinceFrame.hand(this.id);
   if(!sinceHand.valid) return vec3.create();
   return [
     this._translation[0] - sinceHand._translation[0],