Fix review comments

Fix typos (THe -> The).
Use const and a ternary expression instead of let.
Remove unwanted template backticks.
Add separate function to create/get metric Bucket (getMetricBucket).

packages/opencensus-core/src/stats/types.ts

@@ -68,7 +68,7 @@ export interface Stats {
    *     tags could either be explicitly passed to the method, or implicitly
    *     read from current execution context.
    * @param attachments optional The contextual information associated with an
-   *     example value. THe contextual information is represented as key - value
+   *     example value. The contextual information is represented as key - value
    *     string pairs.
    */
   record(

packages/opencensus-core/src/stats/view.ts

@@ -25,7 +25,7 @@ import {isValidTagKey} from '../tags/validation';
 import {BucketBoundaries} from './bucket-boundaries';
 import {MetricUtils} from './metric-utils';
 import {Recorder} from './recorder';
-import {AggregationData, AggregationType, Measure, Measurement, View} from './types';
+import {AggregationData, AggregationType, Measure, Measurement, StatsExemplar, View} from './types';
 
 const RECORD_SEPARATOR = String.fromCharCode(30);
 
@@ -116,7 +116,7 @@ export class BaseView implements View {
    * @param measurement The measurement to record
    * @param tags The tags to which the value is applied
    * @param attachments optional The contextual information associated with an
-   *     example value. THe contextual information is represented as key - value
+   *     example value. The contextual information is represented as key - value
    *     string pairs.
    */
   recordMeasurement(
@@ -235,27 +235,8 @@ export class BaseView implements View {
       const buckets = [];
       for (let bucket = 0; bucket < data.bucketCounts.length; bucket++) {
         const bucketCount = data.bucketCounts[bucket];
-        let statsExemplar;
-        if (exemplars) {
-          statsExemplar = exemplars[bucket];
-        }
-
-        let metricBucket;
-        if (statsExemplar) {
-          // Bucket with an Exemplar.
-          metricBucket = {
-            count: bucketCount,
-            exemplar: {
-              value: statsExemplar.value,
-              timestamp: timestampFromMillis(statsExemplar.timestamp),
-              attachments: statsExemplar.attachments
-            }
-          } as metricBucket;
-        } else {
-          // Bucket with no Exemplar.
-          metricBucket = {count: bucketCount};
-        }
-        buckets.push(metricBucket);
+        const statsExemplar = exemplars ? exemplars[bucket] : undefined;
+        buckets.push(this.getMetricBucket(statsExemplar, bucketCount));
       }
 
       value = {
@@ -280,6 +261,24 @@ export class BaseView implements View {
     return this.tagValueAggregationMap[this.encodeTagValues(tagValues)];
   }
 
+  /** Returns a Bucket with count and examplar (if present) */
+  private getMetricBucket(statsExemplar: StatsExemplar, bucketCount: number):
+      metricBucket {
+    if (statsExemplar) {
+      // Bucket with an Exemplar.
+      return {
+        count: bucketCount,
+        exemplar: {
+          value: statsExemplar.value,
+          timestamp: timestampFromMillis(statsExemplar.timestamp),
+          attachments: statsExemplar.attachments
+        }
+      };
+    }
+    // Bucket with no Exemplar.
+    return {count: bucketCount};
+  }
+
   /** Determines whether the given TagKeys are valid. */
   private validateTagKeys(tagKeys: TagKey[]): TagKey[] {
     const tagKeysCopy = Object.assign([], tagKeys);

packages/opencensus-core/test/test-recorder.ts

@@ -176,9 +176,9 @@ describe('Recorder', () => {
           }
         });
 
-    describe(`for distribution aggregation data with attachments`, () => {
+    describe('for distribution aggregation data with attachments', () => {
       const attachments = {'k1': 'v1', 'k2': 'v2', 'k3': 'v3'};
-      it(`should record measurements and attachments correctly`, () => {
+      it('should record measurements and attachments correctly', () => {
         const distributionData: DistributionData = {
           type: AggregationType.DISTRIBUTION,
           tagValues,