From 0a239005a9585e203fb9ad17485b5a1fe979b0cd Mon Sep 17 00:00:00 2001
From: Eric Rosenbaum <eric.rosenbaum@gmail.com>
Date: Tue, 6 Feb 2018 11:06:48 -0500
Subject: [PATCH] Rename and initialize vars

---
 src/blocks/scratch3_sensing.js | 34 ++++++++++++++++++++++++----------
 1 file changed, 24 insertions(+), 10 deletions(-)

diff --git a/src/blocks/scratch3_sensing.js b/src/blocks/scratch3_sensing.js
index acecc3733..fd60c4caa 100644
--- a/src/blocks/scratch3_sensing.js
+++ b/src/blocks/scratch3_sensing.js
@@ -15,6 +15,24 @@ class Scratch3SensingBlocks {
          */
         this._answer = '';
 
+        /**
+         * The timer utility.
+         * @type {Timer}
+         */
+        this._timer = new Timer();
+
+        /**
+         * The stored microphone loudness measurement.
+         * @type {number}
+         */
+        this._cachedLoudness = -1;
+
+        /**
+         * The time of the most recent microphone loudness measurement.
+         * @type {number}
+         */
+        this._cachedLoudnessTimestamp = 0;
+
         /**
          * The list of queued questions and respective `resolve` callbacks.
          * @type {!Array}
@@ -24,8 +42,6 @@ class Scratch3SensingBlocks {
         this.runtime.on('ANSWER', this._onAnswer.bind(this));
         this.runtime.on('PROJECT_START', this._resetAnswer.bind(this));
         this.runtime.on('PROJECT_STOP_ALL', this._clearAllQuestions.bind(this));
-
-        this.timer = new Timer();
     }
 
     /**
@@ -223,16 +239,14 @@ class Scratch3SensingBlocks {
         if (typeof this.runtime.currentStepTime === 'undefined') return -1;
 
         // Only measure loudness once per step
-        if (this.loudnessTime) {
-            const timeSinceLoudness = this.timer.time() - this.loudnessTime;
-            if (timeSinceLoudness < this.runtime.currentStepTime) {
-                return this.loudness;
-            }
+        const timeSinceLoudness = this._timer.time() - this._cachedLoudnessTimestamp;
+        if (timeSinceLoudness < this.runtime.currentStepTime) {
+            return this._cachedLoudness;
         }
 
-        this.loudnessTime = this.timer.time();
-        this.loudness = this.runtime.audioEngine.getLoudness();
-        return this.loudness;
+        this._cachedLoudnessTimestamp = this._timer.time();
+        this._cachedLoudness = this.runtime.audioEngine.getLoudness();
+        return this._cachedLoudness;
     }
 
     getAttributeOf (args) {