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When using optional chaining (?.), ensure that all subsequent operations in the chain are also protected from null/undefined values. A common mistake is only protecting the initial object access while leaving subsequent method calls or property accesses vulnerable.

Problems to avoid:

1. Unprotected method returns:

   // PROBLEMATIC: scrollSnapList() result is unprotected
   api?.scrollSnapList().map(...)
   

2. Incorrect control flow with void returns:

   // PROBLEMATIC: OR operator doesn't work with void returns
   onClick={() => onClickStep?.(index, setStep) || onClickStepGeneral?.(index, setStep)}
   

Better approaches:

1. Protect the entire chain: ```typescript // BETTER: Both api and its method result are protected api?.scrollSnapList()?.map(…)

// BEST: Add length check for extra safety api?.scrollSnapList()?.length > 0 && api.scrollSnapList().map(…)

2. Use proper conditionals for control flow:
```typescript
// Option 1: Explicit conditional
onClick={() => {
  if (onClickStep) {
    onClickStep(index, setStep);
  } else {
    onClickStepGeneral?.(index, setStep);
  }
}}

// Option 2: Execute both with separate optional chaining
onClick={() => {
  onClickStep?.(index, setStep);
  onClickStepGeneral?.(index, setStep);
}}

Always trace through the entire chain of operations when working with potentially null/undefined values to ensure each step is properly protected.