Typescript & readonly property
https://www.typescriptlang.org/docs/handbook/classes.html#readonly-modifier
class Octopus {
readonly name: string;
readonly numberOfLegs: number = 8;
constructor (theName: string) {
this.name = theName;
}
}
let dad = new Octopus("Man with the 8 strong legs");
dad.name = "Man with the 3-piece suit"; // error! name is readonly.
https://www.typescriptlang.org/docs/handbook/utility-types.html#readonlyt
interface Todo {
title: string;
}
const todo: Readonly<Todo> = {
title: 'Delete inactive users',
};
todo.title = 'Hello'; // Error: cannot reassign a readonly property
// Object.freeze
function freeze<T>(obj: T): Readonly<T>;
Object.freeze
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/freeze
const
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/const
refs
https://www.tutorialsteacher.com/typescript/typescript-readonly
class Employee {
readonly empCode: number;
empName: string;
constructor(code: number, name: string) {
this.empCode = code;
this.empName = name;
}
}
let emp = new Employee(10, "John");
emp.empCode = 20; //Compiler Error
emp.empName = 'Bill'; //Compiler Error
https://mariusschulz.com/blog/read-only-properties-in-typescript
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