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Questions and Answers
What utility type is used to create a type by selecting a subset of properties from another type?
What utility type is used to create a type by selecting a subset of properties from another type?
- Omit
- Exclude
- Record
- Pick (correct)
Which utility type is designed to remove specific properties from a given type?
Which utility type is designed to remove specific properties from a given type?
- NonNullable
- Omit (correct)
- Required
- Exclude
What is the purpose of the ReturnType utility type?
What is the purpose of the ReturnType utility type?
- To manage the type of the 'this' context
- To determine the type of a parameter passed to a function
- To obtain the constructor type of a function
- To extract the return type of a function (correct)
Which utility type allows the construction of a type by excluding certain properties from a union type?
Which utility type allows the construction of a type by excluding certain properties from a union type?
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Which utility type enforces a property to be non-nullable?
Which utility type enforces a property to be non-nullable?
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Study Notes
Utility Types
- Awaited: Represents the type of a Promise's resolved value.
- Partial: Creates a type that makes all properties of a type optional.
- Required: Creates a type that makes all properties of a type required.
- Readonly: Creates a type that makes all the properties of an object read-only.
- Record: Creates a type that maps a string key to a given value type.
- Pick: Creates a new type that includes only the specified properties of an existing type.
- Omit: Creates a new type that excludes the specified properties of an existing type.
- Exclude: Excludes the specified type from a union type.
- Extract: Extracts the specified type from a union type.
- NonNullable: Removes the 'null' and 'undefined' types from a union type.
- Parameters: Extracts the types of the parameters from a function.
- ConstructorParameters: Extracts the types of the parameters from a constructor function.
- ReturnType: Extracts the return type of a function.
- InstanceType: Extracts the type of the instance of a class.
- ThisParameterType: Extracts the type of the 'this' parameter in a function.
- OmitThisParameter: Creates a new type that omits the 'this' parameter from a function.
- ThisType: Extracts the type of the 'this' keyword in a class.
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