Getter and setter with types in Typescript - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is a getter in TypeScript?

A getter is a special method that allows you to access the value of a property. It looks like a property but runs code when you get the value.

beginner

What is a setter in TypeScript?

A setter is a special method that lets you set the value of a property. It runs code when you assign a value, allowing validation or other logic.

intermediate

How do you specify the type of a getter's return value?

You add a return type after the getter method name, like get propertyName(): Type { ... }.

intermediate

How do you type the parameter of a setter in TypeScript?

You specify the type of the single parameter in the setter method, like set propertyName(value: Type) { ... }.

beginner

Why use getters and setters instead of public properties?

Getters and setters let you control how values are read or changed. You can add checks, format data, or trigger actions when values change.

How do you declare a getter for a property named name returning a string in TypeScript?

A get name(): string { return this._name; }

B set name(value: string) { this._name = value; }

C function getName(): string { return this._name; }

D name(): string { return this._name; }

A getter uses the get keyword and specifies the return type after the method name.

What is the correct way to type a setter for a property age that accepts a number?

A get age(): number { return this._age; }

B set age(): number { this._age = value; }

C set age(value: number) { this._age = value; }

D age(value: number) { this._age = value; }

A setter uses the set keyword and takes one typed parameter.

Which of these is true about getters and setters in TypeScript?

A They are only used for private properties.

B They allow adding logic when getting or setting a property.

C They cannot have types.

D They replace methods completely.

Getters and setters let you run code when properties are accessed or changed.

What happens if you try to set a property without a setter?

A The program crashes.

B The property value changes normally.

C The getter runs instead.

D TypeScript will give an error if the property is readonly.

If a property has only a getter, it is readonly and cannot be set.

How do you access a property with a getter in TypeScript?

A Like a normal property, without parentheses.

B By calling it like a function with parentheses.

C Using a special method like getProperty().

D You cannot access it directly.

Getters look like normal properties when accessed.

Explain how to create a typed getter and setter for a property in TypeScript.

Think about how you define methods with types but use get/set keywords.

Why might you want to use getters and setters instead of public properties?

Consider how you protect or manage data in real life, like a safety lock.