Update index.js

nicolasgarnier · web-flow · commit 33bc21b3fbc1 · 2018-04-06T20:06:50.000+02:00
diff --git a/firestore/extend-with-functions/functions/index.js b/firestore/extend-with-functions/functions/index.js
@@ -87,7 +87,7 @@ function readingData() {
           const newValue = change.after.data();
 
           // ...or the previous value before this update
-          const previousValue = change.after.data();
+          const previousValue = change.before.data();
         });
     // [END reading_data]
 }

Original file line number	Diff line number	Diff line change
`@@ -87,7 +87,7 @@ function readingData() {`
`87`	`87`	`const newValue = change.after.data();`
`88`	`88`
`89`	`89`	`// ...or the previous value before this update`
`90`		`- const previousValue = change.after.data();`
	`90`	`+ const previousValue = change.before.data();`
`91`	`91`	`});`
`92`	`92`	`// [END reading_data]`
`93`	`93`	`}`