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Avoid Object Wrapper Types (String, Number, Boolean, Symbol, BigInt)

TypeScript models this distinction by having distinct types for the primitives and their object wrappers:

• string and String
• number and Number
• boolean and Boolean
• symbol and Symbol
• bigint and BigInt

Things to Remember

• Avoid TypeScript object wrapper types. Use the primitive types instead: string instead of String, number instead of Number, boolean instead of Boolean, symbol instead of Symbol, and bigint instead of BigInt.
• Understand how object wrapper types are used to provide methods on primitive values. Avoid instantiating them or using them directly, with the exception of Symbol and BigInt.