Difference between .some(), .includes(), and .findIndex()

Let’s compare .some(), .includes(), and .findIndex() to see why .some() is the best choice in this case.

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1. Why Not .includes()?

How .includes() Works

• .includes(value) only works for exact matches in an array.

• It checks if the array contains the exact string or number.

Why It Won’t Work Here

Your case needs partial matching (window.location.hostname.includes(host)), but .includes() only checks for exact matches.

🔴 Example: Doesn't Work for Partial Matching

const hosts = ["localhost", "127.0.0.1"];

const isLocal = hosts.includes(window.location.hostname);

console.log(isLocal);

❌ This only works if window.location.hostname is exactly "localhost" or "127.0.0.1", but it fails if the hostname is "localhost:4200" (which is common in Angular development).

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2. Why Not .findIndex()?

How .findIndex() Works

• It searches for an element that meets a condition and returns its index.

• If found, it returns the index (0 or higher).

• If not found, it returns -1.

Why .some() is Better Here

✔ .some() returns a boolean (true/false) directly, whereas .findIndex() needs extra checking.

🔴 Example: Works, but Requires Extra Code

const hosts = ["localhost", "127.0.0.1"];

const isLocal = hosts.findIndex((host) => window.location.hostname.includes(host)) !== -1;

console.log(isLocal);

• Extra step: We need to compare the result with -1 manually.

• Not as clean as .some().

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3. Why .some() is the Best Choice

How .some() Works

• It loops through the array and stops immediately when it finds a match.

• It returns true or false directly.

✔ Best for checking "Does at least one element match?"
✔ Cleaner than .findIndex() because it directly returns a boolean
✔ More flexible than .includes() because it supports partial matching

✅ Correct & Clean Code Using .some()

const isLocal = ["localhost", "127.0.0.1"].some((host) =>

  window.location.hostname.includes(host)

);

console.log(isLocal);

• No extra checks needed (unlike .findIndex()).

• Handles partial matches (unlike .includes()).

• Stops early when a match is found (better performance).

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Final Comparison Table

Method	Returns	Works for Partial Matches?	Extra Code Needed?	Stops Early?
.some()	true/false	✅ Yes	❌ No extra checks	✅ Yes
.includes()	true/false	❌ No (exact match only)	❌ No extra checks	✅ Yes
.findIndex()	index/-1	✅ Yes	✅ Needs !== -1 check	✅ Yes

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Conclusion

👉 .some() is the best choice because:

• It directly returns true or false.

• It supports partial matching (unlike .includes()).

• It stops early for better performance.

• It avoids extra comparisons (unlike .findIndex()).

So, using .some() in your getImagePath function is the correct and optimal choice!