feat: implement basic js utilities

src/util.tsx

@@ -0,0 +1,61 @@
+import Big from "big.js";
+import { fromUnixTime, intlFormat } from "date-fns";
+
+export const sleep = (timeout: number) =>
+  new Promise((res) => setTimeout(res, timeout));
+
+export const parseOptionalFloat = (text: string) => {
+  const result = parseFloat(text);
+  if (Number.isNaN(result)) return undefined;
+
+  return result;
+};
+
+// Source: https://stackoverflow.com/a/34591063
+export const roundToStep = (value: number, step = 1.0) => {
+  const inv = new Big(1.0).div(step);
+  return inv.mul(value).round().div(inv).toNumber();
+};
+
+export const getDisplayDateFromUnix = function (unix: number) {
+  return intlFormat(
+    fromUnixTime(unix),
+    {
+      day: "2-digit",
+      month: "2-digit",
+      year: "numeric",
+    },
+    {
+      locale: "de-CH",
+    }
+  );
+};
+
+export const resetInput =
+  (defaultValue: any, eventName = "input") =>
+  (evt: FocusEvent) => {
+    const el = evt.target as HTMLInputElement | null;
+    if (!el) {
+      return;
+    }
+
+    if (el.value !== "") {
+      return;
+    }
+
+    el.value = defaultValue;
+    const event = new Event(eventName, { bubbles: true });
+    el.dispatchEvent(event);
+  };
+
+// https://dev.to/codebubb/how-to-shuffle-an-array-in-javascript-2ikj
+export const shuffle = (list: any[]) => {
+  for (let i = list.length - 1; i > 0; i--) {
+    const j = Math.floor(Math.random() * (i + 1));
+    const temp = list[i];
+    list[i] = list[j];
+    list[j] = temp;
+  }
+
+  return list;
+};