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The article explains that Swift’s nil differs from Objective‑C’s null pointer by representing ‘no value’ for any type through optionals, details how various optionals (Bool?, String?, class?, enum?) are encoded in memory, shows the extra byte cost for Int?, and advises minimizing optional Int fields in structs, using 0 when appropriate.
The article demonstrates how to examine a running Go program’s memory layout by defining example structs, using unsafe.Sizeof/Alignof, dumping writable regions via a Bash script and GDB, and locating fields and string constants in the resulting memory dumps to verify object representation.
This article explains Go's method sets, the relationship between method receivers and method sets, how interfaces work, and the role of embedding, providing code examples that illustrate value vs pointer receivers, interface implementation rules, and embedding differences for struct types.