Answer
const: Compile-time constant; must be assigned at declaration and is implicitly static.
readonly: Runtime constant; can be assigned at declaration or inside the constructor and allows flexibility when values depend on runtime state.
Quick Answer
const is a compile-time constant — must be assigned at declaration, implicitly static, value baked into caller assemblies. readonly is a runtime constant — can be set in the constructor, works with complex types, and avoids versioning issues since consumers always read the current value.
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SugharaIQ Editorial Team
Verified Answer
This answer has been peer-reviewed by industry experts holding senior engineering roles to ensure technical accuracy and relevance for modern interview standards.
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Source: SugharaIQ