Added helper and task files

demo/src/examples/util/helper.js

@@ -0,0 +1,19 @@
+export const getElements = id => {
+    const element = document.getElementById('example-1');
+    const button = element.querySelector('.btn');
+    const console = element.querySelector('.console');
+    const start = console.querySelector('.console__on-start');
+    const done = console.querySelector('.console__on-done');
+    const end = console.querySelector('.console__on-end');
+
+    return {
+        element,
+        console: {
+            console,
+            start,
+            done,
+            end
+        },
+        button
+    };
+};

demo/src/examples/util/task.js

@@ -0,0 +1,17 @@
+export const queueTasks = (instance, count, { onStart, onDone, onEnd }) => {
+    const orderOfCompletion = [];
+    for (let i = 0; i < count; i++) {
+        instance.add(task(i + 1, orderOfCompletion));
+    }
+    instance.onStart = onStart;
+    instance.onDone = onDone;
+    instance.onEnd = onEnd;
+};
+
+export const task = (number, orderOfCompletion = []) => done => {
+    const timeout = Math.random() * 1000;
+    setTimeout(() => {
+        done();
+        orderOfCompletion.push(number);
+    }, timeout);
+};