Debugging.

Debugging tools, techniques, and methodology. Covers 8 sub-skills.

• Debugging · 1 of 3

  Logging Strategies

  What is the recommended default log level for production?

  AINFOBTRACECDEBUGDERROR

• Debugging · 2 of 3

  Memory Leak Detection

  What does WeakRef.deref() return if the object has been garbage collected?

  AIt throws a ReferenceErrorBundefinedCAn empty objectDnull

• Debugging · 3 of 3

  Memory Leak Detection

  Which heap analysis signal most strongly indicates a closure-based memory leak?

  AGrowing retained-size chains rooted in stale closuresBLower scavenge-cycle frequency once the working set has stabilizedCTotal heap returning to baseline after each idle period of the processDA short burst of allocations that is reclaimed at the next major GC