renamed folder "app" to "src"

src/util.ts

@@ -0,0 +1,29 @@
+export const createPlaceholders = ( arr: any[] ) => {
+    return arr.map(() => '?').join(', ');
+}
+
+export type AddDollarPrefix<T> = {
+  [K in keyof T as `$${string & K}`]: T[K];
+};
+
+export function prefixKeysWithDollar<T extends Record<string, any>>(obj: T): AddDollarPrefix<T> {
+  const result = {} as AddDollarPrefix<T>;
+
+  for (const key in obj) {
+    const newKey = `$${key}` as keyof AddDollarPrefix<T>;
+    result[newKey] = obj[key] as any;
+  }
+
+  return result;
+}
+
+export function transformArray<T extends Record<string, any>>(arr: T[]): AddDollarPrefix<T>[] {
+  return arr.map(prefixKeysWithDollar);
+}
+
+export function pad_l2 ( _thing: string | number ): string {
+  if ( typeof _thing == "number" ) {
+    _thing = JSON.stringify(_thing);
+  };
+  return _thing.padStart(2, "0");
+}