Readonly Modifier

Snippet

The 'readonly' keyword makes a property immutable. It can only be assigned a value at declaration or within the constructor of the class.

snippet.ts
typescript
class Car {
  readonly brand: string;
  constructor(b: string) { this.brand = b; }
}

Breakdown

readonly brand: string

Declares a property that cannot be changed after the object is created.

this.brand = b

Setting the value in the constructor is allowed for readonly properties.

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