Handbook - Enums

Enums are one of the few features TypeScript has which is not a type-level extension of JavaScript. Enums allow a developer to define a set of named constants. Using enums can make it easier to document intent, or create a set of distinct cases. TypeScript provides both numeric and string-based enums. Numeric enums We’ll first start off with numeric enums, which are probably more familiar if you’r

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String enums 文字列列挙型 "In a string enum, each member has to be constant-initialized with a string literal, or with another string enum member."