Typescript Utils

get-obj.ts

export function getObj<V>(getObj: () => V): V | undefined {
  let value: undefined | V;
  let shouldReturnUndefined: boolean = false;
  try {
    value = getObj();
  } catch (e) {
    if (e instanceof TypeError) {
      shouldReturnUndefined = true;
    }
  }

  if (shouldReturnUndefined) {
    return undefined;
  }

  return value;
}

get-or-return.ts

export function getOrReturn<T>(value: T | undefined | null, failover: T): T {
  let result: T = failover;
  if (value !== undefined && value !== null) {
    result = value;
  }
  return result;
}