source files -> src/ folder

src/utils/common.js

@@ -0,0 +1,20 @@
+module.exports = {
+    range: range
+};
+
+/**
+ * Generates list of numbers
+ * @param  {Number} start starting value
+ * @param  {Number} num   amount of numbers in list
+ * @param  {Number} step  difference value
+ * @return {Array}        list of numbers
+ */
+function range(start, num, step) {
+    var list = [];
+    var val = start;
+    for (var i = 0; i < num; i++) {
+        list.push(val);
+        val += step;
+    }
+    return list;
+}