Write a function `omit(obj, keys)` that returns a new object without the specified keys.

Problem Statement

<p>Write a function <code>omit(obj, keys)</code> that returns a new object without the specified keys.</p>

Examples

Input: obj = { a: 1, b: 2, c: 3 }, keys = ["b"]

Output: { a: 1, c: 3 }

Explanation: Key "b" is omitted from the result.

Complexity

Time Complexity: O(N)

Space Complexity: O(1)

Hints

💡 Hint 1: Create a new object with all properties, then remove the specified keys. 💡 Hint 2: Or filter Object.entries() and reconstruct the object. 💡 Hint 3: const set = new Set(keys); return Object.fromEntries(Object.entries(obj).filter(([k]) => !set.has(k)));

Editorial & Approach

Problem Overview & Intuition

To solve Omit Properties from Object, we consider the execution characteristics of JavaScript engines. Write a function `omit(obj, keys)` that returns a new object without the specified keys. By utilizing idiomatic language constructs and clean algorithmic principles, we can accomplish this with optimal time and memory usage.

Step-by-Step Approach

Understand Problem Contract: Identify input arguments, return type expectations, and edge cases (empty inputs, nullish values).
Choose Core Mechanism: Use modern JavaScript patterns (create a new object with all properties, then remove the specified keys).
Implement Logic: Handle state and transformations efficiently (or filter object.entries() and reconstruct the object).
Return Result: Ensure proper return format and preserve caller context if applicable.

Optimal Implementation (JavaScript)

function omit(obj, keys) {
  const set = new Set(keys);
  return Object.fromEntries(Object.entries(obj).filter(([k]) => !set.has(k)));
}

Complexity Analysis

Time Complexity O(N) linear scan over input

Space Complexity O(1) constant auxiliary space (or O(N) output)

Edge Cases & Corner Traps Handled

Empty or boundary inputs (empty arrays, strings, zero length).
Type checks and unexpected values (e.g. null, undefined, negative numbers).
Closure preservation and memory isolation between separate invocations.

Omit Properties from Object

Medium

Write a function omit(obj, keys) that returns a new object without the specified keys.

Example Scenarios

1Example 1

Input: obj = { a: 1, b: 2, c: 3 }, keys = ["b"]

Output: { a: 1, c: 3 }

Explanation:

Key "b" is omitted from the result.

Editor

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{"a":1,"c":3}