Add tags fields & add findByTags getter

store/resources.js

@@ -1,9 +1,21 @@
 import resources from '../resources/'
 
+/**
+ * Check if list 2 has an element of list 1.
+ * includesElOf(list1, list2) -> read as list1 includesElOf list2.
+ * @param {any[]} list1 
+ * @param {any[]} list2 
+ */
+const includesElOf = (list1, list2) => list1.some(element => list2.includes(element))
+
 export const state = () => resources
 
 export const getters = {
   findResources: state => title => {
     return state.find(resource => resource.title.toLowerCase() === title.toLowerCase())
+  },
+  findByTags: state => tags => {
+    const flat = state.map(category => category.resources).flat()
+    return flat.filter(resource => resource.tags && includesElOf(resource.tags, tags)) 
   }
 }