- added Categories to the Task List.

- Drawer added SubMenu : Personal / Work Todo list categories.

src/classes/debounce.ts

@@ -0,0 +1,42 @@
+
+/**
+ * A function that emits a side effect and does not return anything.
+ */
+export type Procedure = (...args: any[]) => void
+
+export type Options = {
+  isImmediate: boolean
+}
+
+export function debounce<F extends Procedure>(
+  func: F,
+  waitMilliseconds: number = 50,
+  options: Options = {
+    isImmediate: false
+  }
+): F {
+  let timeoutId: NodeJS.Timeout | undefined
+
+  return function(this: any, ...args: any[]) {
+    const context = this
+
+    const doLater = function() {
+      timeoutId = undefined
+      if (!options.isImmediate) {
+        func.apply(context, args)
+      }
+    }
+
+    const shouldCallNow = options.isImmediate && timeoutId === undefined
+
+    if (timeoutId !== undefined) {
+      clearTimeout(timeoutId)
+    }
+
+    timeoutId = <any>setTimeout(doLater, waitMilliseconds)
+
+    if (shouldCallNow) {
+      func.apply(context, args)
+    }
+  } as any
+}