dtipson · April 24, 2017 20:58 · Apr 24, 2017
diff --git a/KeyedCollection.js b/KeyedCollection.js
@@ -0,0 +1,58 @@
+const getProp = prop => object => object[prop]
+function KeyedCollection (Iterable, prop){
+  if (!(this instanceof KeyedCollection)) {
+    return new KeyedCollection(Iterable, prop);
+  }
+  if(!prop){
+    throw new Error('must supply a prop')
+  }
+  const it_target = []
+  const selectPropFrom = getProp(prop)
+  //Functor.map(obj=>[getProp(prop)(obj),obj])
+  for (item of Iterable){
+    it_target.push([String(selectPropFrom(item)),item])
+  }
+
+  this.selectPropFrom = selectPropFrom
+  this.prop = prop;
+  this.map = new Map(
+    it_target
+  )
+}
+
+KeyedCollection.prototype.get = function(key){
+  return this.map.get(String(key))//mutates!
+}
+KeyedCollection.prototype.has = function(key){
+  return this.map.has(String(key))
+}
+KeyedCollection.prototype.size = function(){
+  return this.map.size()
+}
+KeyedCollection.prototype.clear = function(){
+  return this.map.clear()
+}
+KeyedCollection.prototype.delete = function(key){
+  return this.map.delete(key)//mutates!
+}
+
+KeyedCollection.prototype[Symbol.iterator] = function* (){
+  for (let [k,v] of this.map){
+    yield v
+  }
+}
+
+KeyedCollection.prototype.addFromArray = function(ArrayOfObjects){
+  for (obj of ArrayOfObjects){
+    this.map.set(this.selectPropFrom(obj),obj)
+  }
+  return this;
+}
+
+//another attempt to save an iteration.... [...KeyedCollection.toReact(Component)]
+KeyedCollection.prototype.toReact = function *(Component){
+  for (let [key,v] of this.map){
+    yield Component(Object.assign(v,{key}))//is key getting assigned in the React way here?
+    //have to actually try this out...
+  }
+}
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