TypeScript Developer Interview Questions
Ready to rock with TypeScript? This guide is your TypeScript compiler. It's filled with interview questions to help you find the perfect TypeScript Developer. Whether you're delving into their type definitions, strong typing, or JavaScript expertise, these questions are curated to unveil their mastery of this superset language.
How does TypeScript enhance JavaScript development?
Answer: TypeScript provides static type checking, class-based objects, interfaces, and other features that can improve code quality, readability, and reduce runtime errors.
Can TypeScript be run directly in browsers?
Answer: No, TypeScript needs to be transpiled to JavaScript using the TypeScript compiler before it can be run in browsers.
Explain the difference between 'let' and 'const' in TypeScript.
Answer: 'let' declares a variable that can be reassigned, while 'const' declares a variable with a value that cannot be changed once assigned.
What are Type Annotations in TypeScript?
Answer: Type annotations allow developers to specify the type of value a variable will hold, ensuring type safety.
How can you define custom types in TypeScript?
Answer: Custom types can be defined using "type" or "interface" keywords in TypeScript.
Explain the concept of Generics in TypeScript.
Answer: Generics allow the creation of reusable components while maintaining type safety by allowing a type to be passed as a parameter.
What are TypeScript namespaces?
Answer: Namespaces are used to group related code, avoiding potential naming conflicts in larger codebases.
How does TypeScript handle asynchronous operations?
Answer: TypeScript supports modern JavaScript asynchronous patterns like Promises, async/await, and generators.
Describe the purpose of the 'tsconfig.json' file.
Answer: 'tsconfig.json' is the configuration file for the TypeScript compiler, specifying how TypeScript should be transpiled to JavaScript.
What is a Type Guard in TypeScript?
Answer: A Type Guard is a runtime check that narrows down the type of a variable or object.
Explain 'strictNullChecks' in TypeScript.
Answer: 'strictNullChecks' ensures that values cannot be assigned as null or undefined unless explicitly defined as a possible type.
How does TypeScript handle modules?
Answer: TypeScript supports ES6-style modules, allowing developers to export and import modules using 'import' and 'export' statements.
What are Decorators in TypeScript?
Answer: Decorators are special declarations that can be attached to classes, methods, or properties to add metadata or modify behavior.
How can you achieve polymorphism in TypeScript?
Answer: Polymorphism can be achieved using classes and interfaces, allowing objects of different classes to be treated as objects of a shared superclass or interface.
Explain Enums in TypeScript.
Answer: Enums allow developers to define a set of named constants, enhancing code readability and reducing potential errors.
What is the 'never' type in TypeScript?
Answer: The 'never' type represents values that never occur, typically used in functions that always throw an error or have infinite loops.
How does TypeScript handle Mixins?
Answer: Mixins are a way to combine multiple classes or functions into a single class, achieved using intermediate interfaces and type intersections.
Can you integrate TypeScript with popular JavaScript frameworks?
Answer: Yes, TypeScript can be integrated with frameworks like Angular, React, Vue, and others using type definitions and tools.
What is the 'unknown' type in TypeScript?
Answer: The 'unknown' type represents any value but ensures type checking when trying to access, construct, or apply operations on these values.
How do you handle errors in TypeScript?
Answer: TypeScript uses the 'try-catch-finally' construct, and it also provides type checks at compile time to catch type-related errors.
What are Type Aliases in TypeScript?
Answer: Type aliases allow developers to create custom names for types or type combinations, enhancing code readability.
Can TypeScript be used for server-side development?
Answer: Yes, TypeScript can be used for server-side development, especially when paired with platforms like Node.js.
How do you overload a function in TypeScript?
Answer: Function overloading is achieved by defining multiple type signatures for a function, but only one implementation.
What's the significance of 'readonly' modifier in TypeScript?
Answer: The 'readonly' modifier ensures that a property of a class or interface cannot be reassigned after its initial assignment.
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