What are some examples of type constraints in TypeScript?

What are some examples of type constraints in TypeScript?

Type constraints in TypeScript allow you to specify the types that a generic type can accept. For example, you can use the extends keyword to constrain a type parameter.

Can you give me a specific code example?

Sure! Here's a simple example:

function logLength<T extends { length: number }>(item: T): void {
    console.log(item.length);
}

This function only accepts items that have a length property.

What happens if I try to pass an object without a length property?

If you try to pass an object without a length property, TypeScript will throw a compile-time error, ensuring type safety.

Are there other ways to enforce type constraints?

Yes, you can also use interfaces or union types to enforce more complex constraints on your types.