Lets say you have a class like this:
class ExampleClass {
#foo;
constructor(){
let VarName = 'foo';
let VarNamePrefixed = '#foo';
this[#VarName] = 'Bar'; // won't work, syntax error.
this[VarNamePrefixed] = 'Bar'; // Won't work, escapes into a string.
}
}
Is there a nice way to set private (#foo) variables using the array notation?
You cannot use [] syntax to access private fields.
See the private syntax FAQ.
- This would complicate property access semantics.
- Dynamic access to private fields is contrary to the notion of 'private'.
I don't think you can use square brackets for this, the closest I can think of is using eval, which wouldn't be wise (in any case I don't really see the point, as you'll need to define the private property outside the constructor and not even eval will work there).
class ExampleClass {
#foo
constructor(){
let VarNamePrefixed = '#foo'
eval("this." + VarNamePrefixed + ' = "Bar"')
console.log(this.#foo)
}
}
var foo = new ExampleClass
this[eval(VarNamePrefixed)]