tgrid/src/protocols/internal/once.ts

Grid Computing Framework for TypeScript

/**
 * @internal
 */
export function once<Func>(handler: Func): Func {
  let called: boolean = false;
  let ret: any = undefined;

  return ((...args: any) => {
    if (called === false) {
      ret = (handler as any)(...args);
      called = true;
    }
    return ret;
  }) as any;
}