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");
}