{"@context":"https://schema.org","@type":"Quiz","name":"TypeScript Utility Types","educationalLevel":"intermediate","assesses":"TypeScript","educationalAlignment":[{"@type":"AlignmentObject","alignmentType":"educationalSubject","targetName":"Computer Science"}],"about":{"@type":"Thing","name":"TypeScript"},"description":"A 10 question quiz covering TypeScript. Answers are multiple choice.","hasPart":[{"@type":"Question","eduQuestionType":"Multiple choice","text":"What does `Partial` do?","encodingFormat":"text/markdown","suggestedAnswer":[{"@type":"Answer","position":0,"text":"Makes every property of `T` optional","encodingFormat":"text/plain"},{"@type":"Answer","position":1,"text":"Removes all properties from `T`","encodingFormat":"text/plain"},{"@type":"Answer","position":2,"text":"Makes every property readonly","encodingFormat":"text/plain"},{"@type":"Answer","position":3,"text":"Converts `T` to a tuple","encodingFormat":"text/plain"}],"acceptedAnswer":{"@type":"Answer","position":0,"text":"Makes every property of `T` optional","encodingFormat":"text/plain"}},{"@type":"Question","eduQuestionType":"Multiple choice","text":"What does `Required` do?","encodingFormat":"text/markdown","suggestedAnswer":[{"@type":"Answer","position":0,"text":"Removes optional modifiers from properties of `T`","encodingFormat":"text/plain"},{"@type":"Answer","position":1,"text":"Deletes nullable fields","encodingFormat":"text/plain"},{"@type":"Answer","position":2,"text":"Forces all values to be strings","encodingFormat":"text/plain"},{"@type":"Answer","position":3,"text":"Marks every property as private","encodingFormat":"text/plain"}],"acceptedAnswer":{"@type":"Answer","position":0,"text":"Removes optional modifiers from properties of `T`","encodingFormat":"text/plain"}},{"@type":"Question","eduQuestionType":"Multiple choice","text":"What is `Pick` used for?","encodingFormat":"text/markdown","suggestedAnswer":[{"@type":"Answer","position":0,"text":"To choose a subset of keys `K` from `T` and build a new object type","encodingFormat":"text/plain"},{"@type":"Answer","position":1,"text":"To remove keys `K` from `T`","encodingFormat":"text/plain"},{"@type":"Answer","position":2,"text":"To merge two unrelated types","encodingFormat":"text/plain"},{"@type":"Answer","position":3,"text":"To convert `T` to an array","encodingFormat":"text/plain"}],"acceptedAnswer":{"@type":"Answer","position":0,"text":"To choose a subset of keys `K` from `T` and build a new object type","encodingFormat":"text/plain"}},{"@type":"Question","eduQuestionType":"Multiple choice","text":"What does `Omit` produce?","encodingFormat":"text/markdown","suggestedAnswer":[{"@type":"Answer","position":0,"text":"`T` without the properties listed in `K`","encodingFormat":"text/plain"},{"@type":"Answer","position":1,"text":"`T` with only the properties in `K`","encodingFormat":"text/plain"},{"@type":"Answer","position":2,"text":"A union of `T` and `K`","encodingFormat":"text/plain"},{"@type":"Answer","position":3,"text":"An intersection of `T` and `K`","encodingFormat":"text/plain"}],"acceptedAnswer":{"@type":"Answer","position":0,"text":"`T` without the properties listed in `K`","encodingFormat":"text/plain"}},{"@type":"Question","eduQuestionType":"Multiple choice","text":"What does `Record` represent?","encodingFormat":"text/markdown","suggestedAnswer":[{"@type":"Answer","position":0,"text":"An object type with keys `K` and values `V`","encodingFormat":"text/plain"},{"@type":"Answer","position":1,"text":"A read-only array of `V`","encodingFormat":"text/plain"},{"@type":"Answer","position":2,"text":"A function from `K` to `V`","encodingFormat":"text/plain"},{"@type":"Answer","position":3,"text":"A deep clone of `V`","encodingFormat":"text/plain"}],"acceptedAnswer":{"@type":"Answer","position":0,"text":"An object type with keys `K` and values `V`","encodingFormat":"text/plain"}},{"@type":"Question","eduQuestionType":"Multiple choice","text":"What is the effect of `Readonly`?","encodingFormat":"text/markdown","suggestedAnswer":[{"@type":"Answer","position":0,"text":"Properties of `T` cannot be reassigned through that type","encodingFormat":"text/plain"},{"@type":"Answer","position":1,"text":"The object is frozen at runtime","encodingFormat":"text/plain"},{"@type":"Answer","position":2,"text":"`T` becomes a class","encodingFormat":"text/plain"},{"@type":"Answer","position":3,"text":"All properties become optional","encodingFormat":"text/plain"}],"acceptedAnswer":{"@type":"Answer","position":0,"text":"Properties of `T` cannot be reassigned through that type","encodingFormat":"text/plain"}},{"@type":"Question","eduQuestionType":"Multiple choice","text":"What does `Exclude` do?","encodingFormat":"text/markdown","suggestedAnswer":[{"@type":"Answer","position":0,"text":"Removes from union `U` any member assignable to `V`","encodingFormat":"text/plain"},{"@type":"Answer","position":1,"text":"Removes `V` from an object type","encodingFormat":"text/plain"},{"@type":"Answer","position":2,"text":"Excludes `U` from the program","encodingFormat":"text/plain"},{"@type":"Answer","position":3,"text":"Creates an enum from `U` and `V`","encodingFormat":"text/plain"}],"acceptedAnswer":{"@type":"Answer","position":0,"text":"Removes from union `U` any member assignable to `V`","encodingFormat":"text/plain"}},{"@type":"Question","eduQuestionType":"Multiple choice","text":"What does `Extract` return?","encodingFormat":"text/markdown","suggestedAnswer":[{"@type":"Answer","position":0,"text":"Members of union `U` that are assignable to `V`","encodingFormat":"text/plain"},{"@type":"Answer","position":1,"text":"The difference between `U` and `V`","encodingFormat":"text/plain"},{"@type":"Answer","position":2,"text":"Only the keys shared by `U` and `V`","encodingFormat":"text/plain"},{"@type":"Answer","position":3,"text":"A boolean","encodingFormat":"text/plain"}],"acceptedAnswer":{"@type":"Answer","position":0,"text":"Members of union `U` that are assignable to `V`","encodingFormat":"text/plain"}},{"@type":"Question","eduQuestionType":"Multiple choice","text":"What is `NonNullable` useful for?","encodingFormat":"text/markdown","suggestedAnswer":[{"@type":"Answer","position":0,"text":"Removing `null` and `undefined` from `T`","encodingFormat":"text/plain"},{"@type":"Answer","position":1,"text":"Making `T` nullable","encodingFormat":"text/plain"},{"@type":"Answer","position":2,"text":"Converting `T` to `unknown`","encodingFormat":"text/plain"},{"@type":"Answer","position":3,"text":"Asserting a value is defined at runtime","encodingFormat":"text/plain"}],"acceptedAnswer":{"@type":"Answer","position":0,"text":"Removing `null` and `undefined` from `T`","encodingFormat":"text/plain"}},{"@type":"Question","eduQuestionType":"Multiple choice","text":"What does `ReturnType` give you?","encodingFormat":"text/markdown","suggestedAnswer":[{"@type":"Answer","position":0,"text":"The return type of the function type `fn`","encodingFormat":"text/plain"},{"@type":"Answer","position":1,"text":"The parameter types of `fn`","encodingFormat":"text/plain"},{"@type":"Answer","position":2,"text":"The name of `fn` as a string literal","encodingFormat":"text/plain"},{"@type":"Answer","position":3,"text":"A Promise wrapping `fn`","encodingFormat":"text/plain"}],"acceptedAnswer":{"@type":"Answer","position":0,"text":"The return type of the function type `fn`","encodingFormat":"text/plain"}}]}

TypeScript Utility Types Quiz

Question 1