Practice type systems, generics, utility types, and advanced TypeScript patterns for interviews
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Understand generic constraints, conditional types, and mapped types
Learn utility types, decorators, and type-level programming
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Type annotations and type inference
Interfaces vs types and when to use each
Generics and generic constraints
Utility types (Partial, Pick, Omit, Record)
Conditional and mapped types
TypeScript with React/Node.js
A: Both can define object shapes, but interfaces can be extended and merged (declaration merging), while type aliases are more flexible for unions, intersections, and primitives. Use interface for object shapes that might be extended, and type for unions, mapped types, or when you need more complex type operations.
A: Type narrowing is when TypeScript refines a broader type to a more specific one based on conditional checks. Type guards are expressions that perform runtime checks to narrow types. Built-in guards include typeof, instanceof, and 'in' operator. Custom type guards use 'is' syntax: function isString(value: unknown): value is string { return typeof value === 'string'; }
A: Utility types are built-in generic types that transform existing types. Common ones: Partial<T> makes all properties optional, Required<T> makes all required, Pick<T, K> selects specific properties, Omit<T, K> excludes properties, Record<K, V> creates object type with specific keys and values, ReturnType<T> extracts function return type.
A: Generics allow you to write reusable code that works with multiple types. They're like type parameters: function identity<T>(arg: T): T { return arg; }. You can add constraints with extends: <T extends { length: number }>, use multiple type parameters, and create generic classes and interfaces.
Master the difference between type inference and explicit typing
Understand when to use 'any' vs 'unknown' vs 'never'
Practice with advanced types like conditional types and mapped types
Know how to configure tsconfig.json for different project needs
Be familiar with TypeScript's strict mode options and their implications
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