I'm trying to create an ES6 class with two constructors. The code looks something like this:
class MyClass {
constructor(a, b) {
this.a = a;
this.b = b;
}
constructor(c) {
this.a = c;
this.b = c;
}
}
But I'm getting the syntax error Uncaught SyntaxError: A class may only have one constructor. Is there any workaround that would let me have multiple constructors or am I just limited constructor in JS?
JavaScript doesn't have built-in overloading. But you can do what you want using a default argument.
class myClass {
constructor(a, b = a) {
this.a = a;
this.b = b;
}
}
If it's not as simple as your example, you can give b some other default that's not a possible actual value. Then you can check if the value is the default and run different code.
class myClass {
constructor(a, b = undefined) {
if (b === undefined) {
// do the 1-argument initialization
} else {
// do the 2-argument initialization
}
}
}