JavaScript：获取对象属性未定义则抛错，求标准或第三方库实现

Hey there! I totally get what you're looking for— a ready-made function to validate required options like your example. Let's break down what's available:

Lodash: No Direct Out-of-the-Box Function #

I’ve dug through Lodash’s docs too, and there’s no dedicated function that exactly matches your logic. That said, you can easily combine Lodash’s existing utilities to build a reusable helper that keeps things clean:

const _ = require('lodash');

// Reusable helper to check required options
function getRequiredOption(options, key) {
  const value = _.get(options, key);
  if (value == null) { // Matches both null and undefined
    throw new Error(`${key} is required option`);
  }
  return value;
}

// Use it in your function
function f(options) {
  const x = getRequiredOption(options, 'x');
  // ... rest of your logic
}

_.get is handy here because it safely accesses nested keys if you ever need that later, but even a simple check with _.has could work if you just want to verify existence before accessing.

Standard JavaScript: Build Your Own Minimal Helper #

Since ES6+ doesn’t have a built-in function for this either, you can create a tiny, dependency-free helper that does exactly what you need:

function getRequiredOption(options, key) {
  const value = options[key];
  if (value === null || value === undefined) {
    throw new Error(`${key} is required option`);
  }
  return value;
}

// Usage example
function f(options) {
  const x = getRequiredOption(options, 'x');
  // ... your logic here
}

This is lightweight, easy to understand, and doesn’t require any external libraries at all.

Quick Note for TypeScript Users #

If you’re using TypeScript, you can enforce required options at compile time with type definitions, but you’ll still want a runtime check like the above to handle cases where untyped data comes into your function (like API inputs).

内容的提问来源于stack exchange，提问作者Dylanthepiguy