1 files changed, 31 insertions, 0 deletions
diff --git a/lib.js b/lib.js
new file mode 100644
index 0000000..b529085
--- /dev/null
+++ b/lib.js
@@ -0,0 +1,31 @@
+const Lib = {
+  makeStateContainer(intialState, renderCallback) {
+    let currentState = intialState
+    return {
+     set(newState, afterRenderCallback = () => {}) {
+      currentState = { ...currentState, ...newState }
+      renderCallback()
+      afterRenderCallback()
+     },
+     get() { return currentState }
+   }
+  },
+  splitAt(str, index) {
+    return [str.slice(0, index), str.slice(index)]
+  },
+  readFile(file) {
+    return new Promise(function(resolve, reject) {
+      const reader = new FileReader()
+      reader.onload = function(event) {
+        resolve(event.target.result)
+      }
+      reader.readAsText(file)
+    })
+  },
+  getQueryParam(paramName) {
+    const queryPairs = window.location.search.slice(1).split("&").map(k => k.split("="))
+    const foundPair = queryPairs.find(([name]) =>  name === paramName)
+    if(!foundPair) return null;
+    return foundPair[1]
+  }
+}