chore: first commit

1 files changed, 21 insertions, 0 deletions

diff --git a/src/utils/random.ts b/src/utils/random.ts
new file mode 100644
index 0000000..6df941d
--- /dev/null
+++ b/src/utils/random.ts
@@ -0,0 +1,21 @@
+const random = () => Math.random();
+
+const randFromArray = (array: unknown[]) => array[Math.floor(random() * array.length)];
+
+const randIntFromInterval = (min: number, max: number) => Math.floor(random() * (max - min) + min);
+
+// Durstenfeld shuffle
+const shuffleArrayMutate = <T>(array: T[]): T[] => {
+  for (let i = array.length - 1; i > 0; i--) {
+    const j = Math.floor(Math.random() * (i + 1));
+    [array[i], array[j]] = [array[j], array[i]];
+  }
+
+  return array;
+};
+
+const shuffleArray = <T>(array: T[]): T[] => shuffleArrayMutate([...array]);
+
+const shuffleString = (str: string, delimiter = ''): string => shuffleArrayMutate(str.split(delimiter)).join(delimiter);
+
+export { randFromArray, randIntFromInterval, random, shuffleArray, shuffleArrayMutate, shuffleString };