From 1d3a2aca0e155afbf5a76270b31b2b29a2c12447 Mon Sep 17 00:00:00 2001
From: Bruno Windels <brunow@element.io>
Date: Wed, 21 Apr 2021 17:23:49 +0200
Subject: [PATCH] add 'get' method to common observable map api

---
 src/observable/map/ApplyMap.js          | 4 ++++
 src/observable/map/BaseObservableMap.js | 5 +++++
 src/observable/map/FilteredMap.js       | 7 +++++++
 3 files changed, 16 insertions(+)

diff --git a/src/observable/map/ApplyMap.js b/src/observable/map/ApplyMap.js
index 1a2976ac..feab968c 100644
--- a/src/observable/map/ApplyMap.js
+++ b/src/observable/map/ApplyMap.js
@@ -82,4 +82,8 @@ export class ApplyMap extends BaseObservableMap {
     get size() {
         return this._source.size;
     }
+
+    get(key) {
+        return this._source.get(key);
+    }
 }
diff --git a/src/observable/map/BaseObservableMap.js b/src/observable/map/BaseObservableMap.js
index 61de18dc..79df21f6 100644
--- a/src/observable/map/BaseObservableMap.js
+++ b/src/observable/map/BaseObservableMap.js
@@ -49,4 +49,9 @@ export class BaseObservableMap extends BaseObservable {
     get size() {
         throw new Error("unimplemented");
     }
+
+    // eslint-disable-next-line no-unused-vars
+    get(key) {
+        throw new Error("unimplemented");
+    }
 }
diff --git a/src/observable/map/FilteredMap.js b/src/observable/map/FilteredMap.js
index e164aae3..290dcea6 100644
--- a/src/observable/map/FilteredMap.js
+++ b/src/observable/map/FilteredMap.js
@@ -128,6 +128,13 @@ export class FilteredMap extends BaseObservableMap {
         });
         return count;
     }
+
+    get(key) {
+        const value = this._source.get(key);
+        if (value && this._filter(value, key)) {
+            return value;
+        }
+    }
 }
 
 class FilterIterator {