moved a bunch of files

src/utils/helpers/addOffset.ts

@@ -0,0 +1,23 @@
+/**
+ * Adds a random offset to a number within a certain percentage
+ * @example
+ * // Returns between 95-105
+ * addOffset(100, 5);
+ * @example
+ * // Returns between 63-77
+ * addOffSet(70, 10);
+ * @param midpoint The number to be the midpoint of the offset range
+ * @param percentage The percentage (in a range of 0-100) to offset
+ */
+export function addOffset(midpoint: number, percentage: number): number {
+  const maxPercent = 100;
+  if (percentage < 0 || percentage > maxPercent) {
+    return midpoint;
+  }
+
+  const offset: number = midpoint * (percentage / maxPercent);
+
+  // Double the range to account for both sides of the midpoint.
+  // tslint:disable-next-line:no-magic-numbers
+  return midpoint + (Math.random() * (offset * 2) - offset);
+}