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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?
Which utility type enforces a property to be non-nullable?
Which utility type enforces a property to be non-nullable?
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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Description
Test your knowledge of TypeScript utility types with this quiz. From 'Awaited' to 'ReturnType', explore how these utilities can enhance your programming skills by simplifying type manipulation. Perfect for those looking to deepen their understanding of TypeScript.
