any type

Learn how the any type turns off type checking.

The any type

The any type completely disables type checking for a variable. A variable declared as any can be assigned any type of value and you can access any property on it. This turns off TypeScript's safety.

let x: any = 5;
x = "merhaba";
x = true;
console.log(x);  // true

any is an escape hatch for data of unknown type, but it is unsafe.

any is unsafe

When any is used, TypeScript's type safety is lost. Misspelled property names do not cause compile errors and can cause runtime issues. If you do not know the type, using unknown is safer than any.

let x: any = "metin";
console.log(x.boyunUzunlugu);  // undefined, no error

any should be used sparingly; prefer specific types whenever possible.

Exercise Different types with any

Declare a variable named veri of type any. First assign it "test", then reassign it 42. Print the final value with console.log.

Show example solution

let veri: any = "test";
veri = 42;
console.log(veri);

Test yourself

What does the <code>any</code> type do?
- Prevents null assignment
- Disables type checking for a variable
- Makes the variable constant
- Allows only string values
Show answer

Disables type checking for a variable — <code>any</code> turns off all type checks on a variable; any type of value can be assigned and any property can be accessed.

Add the any type

let deger: ____ = "merhaba";
deger = 100;

Show answer

let deger: any = "merhaba";
deger = 100;

any concepts

any

Disables type checking
let x: any = 5; x = "a";

Allows changing type
any ile erişim

Any property can be accessed
any kaçış yolu

Unsafe but flexible

Next lesson: unknown type

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