Object Property Omission (Omit)
Creates a new object excluding specified properties, useful for removing sensitive or unnecessary fields
Implementation
Copy the complete example or adapt its typed interface to your project. Comments are kept inside the snippet so the intent travels with the code.
/**
* Omit specified properties from object
* @param obj Target object
* @param keys Array of properties to remove
* @returns New object without specified properties
*/
function omitObject<T extends object, K extends keyof T>(obj: T, keys: K[]): Omit<T, K> {
const result = { ...obj };
keys.forEach(key => {
delete result[key];
});
return result;
}
// Usage Example
const user = { id: 1, name: "John", password: "secret", token: "xyz123" };
const publicUser = omitObject(user, ["password", "token"]);
console.log(publicUser); // { id: 1, name: "John" }When to use it
Ideal for removing sensitive data (passwords, tokens) from objects before display or transmission
Review the input assumptions and browser or runtime support before adopting a utility unchanged. Small helpers are easiest to maintain when their contract stays narrow.
Reasoning and trade-offs
How it works
The function walks the source object and copies owned properties whose keys are not in the removal list. The source remains unchanged, and TypeScript describes the result as the original shape without the omitted fields.
What to watch for
A denylist is fragile for secrets: newly added sensitive fields are copied until someone remembers to update the list. Nested objects remain shared references, and enumerable string keys are the only properties handled by the loop.
Production use
Use omit for presentation cleanup where the default is to retain fields. For logs, analytics, or public responses, prefer pick with an allowlist so future model growth cannot leak information by default.
Before you ship
- Confirm the input contract with tests that cover empty, invalid, boundary, and representative real-world values before sharing the helper across a codebase.
- Keep the function focused on one responsibility and name any project-specific policy explicitly instead of hiding it inside a generic-looking utility.
- Measure behavior in the browsers or runtime versions your product supports, especially when timing, storage, DOM state, locale, or network access is involved.
- Document the return type, mutation behavior, failure mode, and performance characteristics beside the call site so future maintainers can evaluate changes safely.
- Compare the example with current official platform documentation when it relies on a browser API, language feature, or runtime behavior that may change over time.
- If the helper crosses a trust boundary, validate again on the server and avoid treating browser-side checks, TypeScript annotations, or formatted output as a security guarantee.
- Add a small regression test whenever a real edge case is discovered; concrete examples preserve the reason behind a guard more reliably than a general comment.