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80 questions found

Showing 61–80 of 80 results

TypeScript · Fill in the Blank
Difficulty: Medium
Fill in the utility type: ____<User, 'email'> retains only the email property.
Utility typesCode completion
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TypeScript · Fill in the Blank
Difficulty: Medium
Fill in the utility type: ____<User, 'passwordHash'> removes the passwordHash property.

Utility typesCode completion

TypeScript · Fill in the Blank

Difficulty: Medium

Fill in the utility type: ____<Settings> makes every Settings property optional.

Utility typesCode completion

TypeScript · Fill in the Blank

Difficulty: Medium

Complete the key type: type UserKey = ____ User.

Type operatorsCode completion

TypeScript · Fill in the Blank

Difficulty: Medium

Fill in the top type that requires narrowing before property access: let externalValue: ____.

Type safetyCode completion

TypeScript · Matching

Difficulty: Medium

Match the descriptions to these basic types terms: string, number, boolean, unknown.

Basic typesConcept relationships

TypeScript · Matching

Difficulty: Medium

Match the descriptions to these combining types terms: Union type, Intersection type, Literal type, Tuple type.

Combining typesConcept relationships

TypeScript · Matching

Difficulty: Medium

Match the descriptions to these object contracts terms: Interface, Type alias, Optional property, Readonly property.

Object contractsConcept relationships

TypeScript · Matching

Difficulty: Medium

Match the descriptions to these narrowing terms: Typeof guard, Instanceof guard, In-operator guard, Type predicate.

NarrowingConcept relationships

TypeScript · Matching

Difficulty: Medium

Match the descriptions to these generics terms: Type parameter, Generic constraint, Default type argument, Keyof.

GenericsConcept relationships

TypeScript · Multiple Select

Difficulty: Medium

Consider [Object.keys; setTimeout; Omit; console.log; Exclude; Array.isArray]. Select all entries that are TypeScript utility types.

Utility typesSet membership

TypeScript · Multiple Select

Difficulty: Medium

Consider [Omit; Array.isArray; Object.keys; Required; JSON.parse; Record]. Select all entries that are TypeScript utility types.

Utility typesSet membership

TypeScript · Multiple Select

Difficulty: Medium

Consider [Partial; JSON.parse; console.log; Object.keys; Array.isArray; Required]. Select all entries that are TypeScript utility types.

Utility typesSet membership

TypeScript · Multiple Select

Difficulty: Medium

Consider [JSON.parse; console.log; Parameters; Exclude; ReturnType; Object.keys]. Select all entries that are TypeScript utility types.

Utility typesSet membership

TypeScript · Multiple Select

Difficulty: Medium

Consider [Array.isArray; setTimeout; JSON.parse; ReturnType; console.log; Record]. Select all entries that are TypeScript utility types.

Utility typesSet membership

TypeScript · True or False

Difficulty: Medium

True or false: A readonly TypeScript property does not automatically become a frozen runtime property.

ReadonlyConcept checks

TypeScript · True or False

Difficulty: Medium

True or false: A TypeScript type assertion validates external JSON against the asserted shape at runtime.

TypesConcept checks

TypeScript · True or False

Difficulty: Medium

True or false: A check for a union's literal discriminant can narrow the value to the matching object alternative.

NarrowingConcept checks

TypeScript · True or False

Difficulty: Medium

True or false: A generic function must discard its input type and return any.

GenericsConcept checks

TypeScript · True or False

Difficulty: Medium

True or false: With strictNullChecks enabled, code generally needs to handle a possible null before accessing an object's properties.

NullabilityConcept checks

Showing 61–80 of 80 results