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Performance review

Hot path complexity

• Time: O(1) per call.
• Space: O(1).
• There are no loops, recursive calls, or input-dependent operations.

Allocation / GC pressure

• For numeric inputs, the function typically creates no heap allocations, so GC pressure is negligible.
• If either operand is a string, + performs concatenation and allocates a new string of size O(len(a) + len(b)).
• Untyped parameters allow mixed operand types, which may introduce coercion and reduce JIT optimization stability at polymorphic call sites.

I/O / N+1 patterns

• No I/O, network, database, filesystem, or N+1 behavior.

Optimized version

function add(a: number, b: number): number {
  return a + b;
}

Change notes

• Added numeric parameter and return types: prevents accidental string concatenation and mixed-type usage; can keep hot call sites monomorphic. Expected algorithmic improvement: none (O(1) remains O(1)), but it may avoid O(len(a) + len(b)) string allocation and coercion when callers pass incorrect types.
• Kept the implementation direct: function-call overhead may be inlined by modern JavaScript engines. Further micro-optimization is unlikely to provide a measurable win in normal workloads.
• GC impact: remains effectively zero for numeric inputs.