Go 1.27 Generic Methods: Type Parameters and Interface Limits
Use Go 1.27 generic methods, distinguish receiver and method type parameters, and design around the interface-method restriction.
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Clear explanations of the details that shape real programs.
Explore Go errors, interfaces, slices, concurrency, modules, and standard-library contracts that affect production code.
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Go Range-Over-Function Iterators: Yield, Stop, and Pull
Implement Go 1.23 iter.Seq correctly, honor early loop exit, convert push iterators with iter.Pull, and manage cleanup.
Go Module Requirements Are Minimum Versions, Not Lock Entries
Read go.mod requirements through minimal version selection, distinguish go.sum from a lockfile, and inspect the selected build list.
Go Synchronization Establishes Observation, Not Execution Order
Use Go happens-before guarantees for visibility without assuming goroutine scheduling, lock fairness, or race-detector completeness.
Go Slice append May Reuse or Replace the Backing Array
Predict Go slice aliasing with length and capacity, limit append with full slice expressions, and copy when storage must be independent.
Go Context Cancellation: Ownership, Causes, and Detachment
Propagate Go context cancellation down call trees, release derived-context resources, preserve causes, and detach work safely.
Go Interfaces Can Hold Typed Nil Pointers
Understand why a Go interface containing a nil pointer is not nil, how assertions behave, and how to prevent non-nil error surprises.
Go Error Trees: Use errors.Is, errors.As, and errors.Join
Inspect wrapped and joined Go errors by identity or type, preserve context with %w, and make deliberate error API commitments.