TypeScript interface

TypeScriptBeginner

Describe the expected shape of an object.

When to use it

Use it to catch mismatched object properties during type checking.

TypeScript · Editable example

interface User { name: string; age: number; }
const user: User = { name: 'Ada', age: 27 };
console.log(user.name);

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Expected output

Ada

Common mistake and fix

TypeScript checks types during compilation, not at runtime.

Related concepts: types, objects, interfaces

Explain this code

Describe the expected shape of an object.

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Educational examples are not a substitute for a real compiler or version-specific documentation. JavaScript, Python and SQLite demos run in isolated browser contexts when supported; Python and SQL load an online WebAssembly runtime on first use. Other languages receive structural hints, not compiler validation. No visitor code executes on WordPress.

TypeScript interface

When to use it

Expected output

Common mistake and fix

Explain this code

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