Initial commit

Utility/chooseWeightedRandom.js

@@ -0,0 +1,15 @@
+function chooseWeightedRandom(items, weights) {
+    let i;
+    let length = weights.length;
+    weights = [...weights];
+
+    for (i = 0; i < length; i++) weights[i] += weights[i - 1] || 0;
+
+    const random = Math.random() * weights[length - 1];
+
+    for (i = 0; i < length; i++) if (weights[i] > random) break;
+
+    return items[i];
+};
+
+module.exports = chooseWeightedRandom;