Lodash库方法是否有助提升性能？是否应优先选用Lodash而非原生JS？

Great question—this is a super common tradeoff developers grapple with when weighing utility libraries against native JS. Let’s break down the key factors to help you decide:

1. Performance: Context Matters #

You’re right that _.get adds overhead (those 10+ instructions) because it’s built to handle a ton of edge cases out of the box:

• Validating input objects and supporting both string paths (like 'a.b.c') and array paths (like ['a','b','c'])
• Safely traversing null/undefined values at any level of the object
• Seamlessly handling default value fallbacks

For simple, one-off property access in most apps, this performance difference is negligible—modern JS engines optimize so well that you’d only notice it in extremely high-volume scenarios (like looping through 100k+ objects). In those cases, vanilla short-circuit checks (!!a && !!a.b && a.b.c) or ES2020’s optional chaining (a?.b?.c) will be faster.

2. Readability & Maintainability #

This is where _.get really shines, especially with complex or dynamic paths:

• Fixed deep paths: Compare _.get(obj, 'a.b.c.d.e') to !!a && !!a.b && !!a.b.c && !!a.b.c.d && a.b.c.d.e—the Lodash version is far cleaner and less error-prone.
• Dynamic paths: If your property path is stored in a variable (e.g., const userPath = ['profile', 'settings', 'notifications']), _.get(obj, userPath) is way simpler than building a vanilla check dynamically (which would require messy loops or eval-like workarounds).
• Default values: _.get(obj, 'a.b.c', 0) eliminates extra null checks and fallback logic, whereas vanilla would need (a?.b?.c) ?? 0 (which requires ES2020 support).

3. Compatibility & Edge Cases #

If your project needs to support older browsers (like IE11) that don’t have optional chaining or nullish coalescing, _.get is a reliable, battle-tested solution. It handles all edge cases (like obj being null, or a path segment pointing to an array index) without you having to write custom logic.

Even in modern environments, _.get can be handy for string paths that include array indices (e.g., _.get(obj, 'users[0].address.city')), which is slightly more concise than obj?.users?.[0]?.address?.city.

4. Team Consistency #

Don’t overlook this! If your team already uses Lodash extensively, sticking with _.get keeps code consistent and avoids cognitive overhead. On the other hand, if your team is moving toward a vanilla-first approach to reduce bundle size, using optional chaining might be the better fit.

Final Verdict #

There’s no one-size-fits-all answer, but here’s a quick rule of thumb:

• Use vanilla (optional chaining + nullish coalescing) if: You’re working in a modern environment, paths are fixed and shallow, or you’re optimizing for high-performance loops.
• Use _.get if: You need dynamic paths, support older browsers, want cleaner syntax for deep paths, or rely on its built-in default value handling.

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