class B{
item = {};
item.name = "example";
}
let b = new B()
What is the reason behind not being able to define an object and add a property inside a class like this?
class B{
item = {};
item.name = "example";
}
let b = new B()
What is the reason behind not being able to define an object and add a property inside a class like this?
When defining instance fields using this syntax (outside of the constructor), keep in mind that you cannot mutate them. It's important not to mistake the = syntax for regular assignment, as it follows different rules. Here is an example of using this syntax:
class A {
["obj"] = {};
}
If you need to mutate fields or properties, you will have to do so within the constructor or another method. However, you are free to initialize the field with a complex object literal.
Note: To create an instance, remember to use the new keyword.
Therefore, you can either:
class A {
obj = { x: 0 };
}
let a = new A();
console.log(a.obj.x);Or you can:
class A {
obj = {};
constructor() {
this.obj.x = 0;
}
}
let a = new A();
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