Add ADD_SUBJECT and REMOVE_SUBJECT action creators and reducer.

actions.js

@@ -0,0 +1,15 @@
+export function addSubject(subject) {
+	return {
+		type: "ADD_SUBJECT",
+		subject: subject
+	};
+}
+
+
+export function removeSubject(id) {
+	return {
+		type: "REMOVE_SUBJECT",
+		id: id
+	};
+}
+

package.json

@@ -11,9 +11,11 @@
   },
   "dependencies": {
     "@react-native-community/async-storage": "^1.8.1",
+    "buffer": "^5.5.0",
     "react": "16.9.0",
     "react-native": "0.61.5",
     "react-native-paper": "^3.6.0",
+    "react-native-uuid": "^1.4.9",
     "react-native-vector-icons": "^6.6.0",
     "react-redux": "^7.2.0",
     "redux": "^4.0.5",

reducers/subjects.js

@@ -1,5 +1,14 @@
-export default function subjects(state) {
+import { v4 } from "react-native-uuid";
+
+export default function subjects(state, action) {
 	if (typeof state === "undefined")
 		return [];
-	return state;
+	switch(action.type) {
+	case "ADD_SUBJECT":
+		return [ ...state, { name: action.subject, id: v4() } ];
+	case "REMOVE_SUBJECT":
+		return state.filter(item => item.id != action.id);
+	default:
+		return state;
+	}
 }

yarn.lock

@@ -1509,7 +1509,7 @@ balanced-match@^1.0.0:
   resolved "https://registry.npmjs.org/balanced-match/-/balanced-match-1.0.0.tgz#89b4d199ab2bee49de164ea02b89ce462d71b767"
   integrity sha1-ibTRmasr7kneFk6gK4nORi1xt2c=
 
-base64-js@^1.1.2, base64-js@^1.2.3:
+base64-js@^1.0.2, base64-js@^1.1.2, base64-js@^1.2.3:
   version "1.3.1"
   resolved "https://registry.npmjs.org/base64-js/-/base64-js-1.3.1.tgz#58ece8cb75dd07e71ed08c736abc5fac4dbf8df1"
   integrity sha512-mLQ4i2QO1ytvGWFWmcngKO//JXAQueZvwEKtjgQFM4jIK0kU+ytMfplL8j+n5mspOfjHwoAg+9yhb7BwAHm36g==
@@ -1620,6 +1620,14 @@ buffer-from@^1.0.0:
   resolved "https://registry.npmjs.org/buffer-from/-/buffer-from-1.1.1.tgz#32713bc028f75c02fdb710d7c7bcec1f2c6070ef"
   integrity sha512-MQcXEUbCKtEo7bhqEs6560Hyd4XaovZlO/k9V3hjVUF/zwW7KBVdSK4gIt/bzwS9MbR5qob+F5jusZsb0YQK2A==
 
+buffer@^5.5.0:
+  version "5.5.0"
+  resolved "https://registry.npmjs.org/buffer/-/buffer-5.5.0.tgz#9c3caa3d623c33dd1c7ef584b89b88bf9c9bc1ce"
+  integrity sha512-9FTEDjLjwoAkEwyMGDjYJQN2gfRgOKBKRfiglhvibGbpeeU/pQn1bJxQqm32OD/AIeEuHxU9roxXxg34Byp/Ww==
+  dependencies:
+    base64-js "^1.0.2"
+    ieee754 "^1.1.4"
+
 bytes@3.0.0:
   version "3.0.0"
   resolved "https://registry.npmjs.org/bytes/-/bytes-3.0.0.tgz#d32815404d689699f85a4ea4fa8755dd13a96048"
@@ -3042,6 +3050,11 @@ iconv-lite@0.4.24, iconv-lite@^0.4.17, iconv-lite@^0.4.24, iconv-lite@~0.4.13:
   dependencies:
     safer-buffer ">= 2.1.2 < 3"
 
+ieee754@^1.1.4:
+  version "1.1.13"
+  resolved "https://registry.npmjs.org/ieee754/-/ieee754-1.1.13.tgz#ec168558e95aa181fd87d37f55c32bbcb6708b84"
+  integrity sha512-4vf7I2LYV/HaWerSo3XmlMkp5eZ83i+/CDluXi/IGTs/O1sejBNhTtnxzmRZfvOUqj7lZjqHkeTvpgSFDlWZTg==
+
 ignore@^4.0.6:
   version "4.0.6"
   resolved "https://registry.npmjs.org/ignore/-/ignore-4.0.6.tgz#750e3db5862087b4737ebac8207ffd1ef27b25fc"
@@ -5097,6 +5110,13 @@ qs@~6.5.2:
   resolved "https://registry.npmjs.org/qs/-/qs-6.5.2.tgz#cb3ae806e8740444584ef154ce8ee98d403f3e36"
   integrity sha512-N5ZAX4/LxJmF+7wN74pUD6qAh9/wnvdQcjq9TZjevvXzSUo7bfmw91saqMjzGS2xq91/odN2dW/WOl7qQHNDGA==
 
+randombytes@^2.0.3:
+  version "2.1.0"
+  resolved "https://registry.npmjs.org/randombytes/-/randombytes-2.1.0.tgz#df6f84372f0270dc65cdf6291349ab7a473d4f2a"
+  integrity sha512-vYl3iOX+4CKUWuxGi9Ukhie6fsqXqS9FE2Zaic4tNFD2N2QQaXOMFbuKK4QmDHC0JO6B1Zp41J0LpT0oR68amQ==
+  dependencies:
+    safe-buffer "^5.1.0"
+
 range-parser@~1.2.1:
   version "1.2.1"
   resolved "https://registry.npmjs.org/range-parser/-/range-parser-1.2.1.tgz#3cf37023d199e1c24d1a55b84800c2f3e6468031"
@@ -5131,6 +5151,13 @@ react-native-safe-area-view@^0.14.6:
   dependencies:
     hoist-non-react-statics "^2.3.1"
 
+react-native-uuid@^1.4.9:
+  version "1.4.9"
+  resolved "https://registry.npmjs.org/react-native-uuid/-/react-native-uuid-1.4.9.tgz#a526742f8fddfe6414500655212ca8d109c40229"
+  integrity sha1-pSZ0L4/d/mQUUAZVISyo0QnEAik=
+  dependencies:
+    randombytes "^2.0.3"
+
 react-native-vector-icons@^6.6.0:
   version "6.6.0"
   resolved "https://registry.npmjs.org/react-native-vector-icons/-/react-native-vector-icons-6.6.0.tgz#66cf004918eb05d90778d64bd42077c1800d481b"
@@ -5533,7 +5560,7 @@ safe-buffer@5.1.2, safe-buffer@~5.1.0, safe-buffer@~5.1.1:
   resolved "https://registry.npmjs.org/safe-buffer/-/safe-buffer-5.1.2.tgz#991ec69d296e0313747d59bdfd2b745c35f8828d"
   integrity sha512-Gd2UZBJDkXlY7GbJxfsE8/nvKkUEU1G38c1siN6QP6a9PT9MmHB8GnpscSmMJSoF8LOIrt8ud/wPtojys4G6+g==
 
-safe-buffer@^5.0.1, safe-buffer@^5.1.2:
+safe-buffer@^5.0.1, safe-buffer@^5.1.0, safe-buffer@^5.1.2:
   version "5.2.0"
   resolved "https://registry.npmjs.org/safe-buffer/-/safe-buffer-5.2.0.tgz#b74daec49b1148f88c64b68d49b1e815c1f2f519"
   integrity sha512-fZEwUGbVl7kouZs1jCdMLdt95hdIv0ZeHg6L7qPeciMZhZ+/gdesW4wgTARkrFWEpspjEATAzUGPG8N2jJiwbg==