backend v4 half

SerpentRace_Backend/node_modules/libphonenumber-js/source/helpers/mergeArrays.js

@@ -0,0 +1,24 @@
+/**
+ * Merges two arrays.
+ * @param  {*} a
+ * @param  {*} b
+ * @return {*}
+ */
+export default function mergeArrays(a, b) {
+	const merged = a.slice()
+
+	for (const element of b) {
+		if (a.indexOf(element) < 0) {
+			merged.push(element)
+		}
+	}
+
+	return merged.sort((a, b) => a - b)
+
+	// ES6 version, requires Set polyfill.
+	// let merged = new Set(a)
+	// for (const element of b) {
+	// 	merged.add(i)
+	// }
+	// return Array.from(merged).sort((a, b) => a - b)
+}