functional queue

src/util.ts

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+
+/**
+ * shuffles an array
+ * https://stackoverflow.com/a/2450976/2856416
+ * @param array an array
+ * @returns an array but shuffled
+ */
+export function shuffle(array: any[]) {
+    let currentIndex = array.length,  randomIndex;
+
+    // While there remain elements to shuffle...
+    while (currentIndex != 0) {
+
+        // Pick a remaining element...
+        randomIndex = Math.floor(Math.random() * currentIndex);
+        currentIndex--;
+
+        // And swap it with the current element.
+        [array[currentIndex], array[randomIndex]] = [
+        array[randomIndex], array[currentIndex]];
+    }
+
+    return array;
+}