OOP JAVASCRIPT PROBLEM !!!

how define the type of variable in constractor javascript oo
Class Personne{
constractor(name){
this.name = name
}
}
how can i make the name type string

Comments

[Hoàng devtrai]

well if you really want the constructor to only receive string, you can just throw an error if the parameter is not a string with "typeof"

if(typeof name !== 'string') throw Error('Only string is allowed you mother fucker');

but nowadays devs use Typescript instead, they can just config the compiler to fail the build if it's violate TS rules, like passing number into string

[Ayoub]

thanks

[codingjlu]

I guess I'm not a dev then. Hmm?

[Tracy Gilmore]

One option is to switch to TypeScript because, as others have stated, JS does not support static typing but TS can help.
A lower impact approach if you are using VSCode is to use type annotations.

class Personne {
    constructor(/** @type string */ name) {
        /** @type string */
        this.name = name;
    }
}

const person1 = new Personne('John');
console.log(person1.name); // 'John'

However, I will not stop this sort of thing happening.

const person2 = new Personne(42);
console.log(person2.name); // 42

But you could change the constructor to state,

this.name = `${name}`;

[Arnab Paryali]

class Person {
  name: string;
  constructor(name: string){
     this.name = name
  }
}

[Jon Randy 🎖️]

You don't. JS doesn't allow you to define the types of variables

This is not a problem, it's just a different way of doing things

[Ayoub]

thanks

[Rodrigo Nascimento]

Javascript has dynamic typing system. So the interpreter will trye to assign a type in execution time.

If you really want to use a static typing you should try to use typescript.

[Ahmed Zougari]

Try this
this.name= String(name)