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Make an object callable
Some libraries offer objects that can be called like a function while also having some other properties. For example, ImmutableJs's List can be constructed using both List() and List.of().
How to make an object callable?
Let's say there is an Obj, that has a property called of, which is a function:
const Obj = {
of: () => {
console.log("Obj.of() called");
}
}
Obj.of(); // Obj.of() called
But what property to add to make Obj() work?
Unfortunately, there is no real solution to this problem. Googling around, you can find a few hackish ones, but none without any problems or being overly complex.
Add properties to a function
But, as it turns out, reversing the problem makes it easy to solve. Don't try to make an Object callable, but add properties to a Function:
const Obj = () => {
console.log("Obj() called");
}
Obj.of = () => {
console.log("Obj.of() called")
}
Obj.of(); // Obj.of() called
Obj(); // Obj() called