I have this chain of methods
MyObject.methodA().methodB().methodC()
Suppose I want methodB() to be added or changed based on some condition:
const inclueMethodB = false;
// change method based on condition
MyObject.methodA().(inclueMethodB ? methodB() : method123()).methodC()
// add method based on condition
MyObject.methodA().(inclueMethodB && methodB()).methodC()
Is there a way to do this in javascript?
I can't think of a way to optionally call a method like that.
If you were choosing between two methods, you could use a subscript where the method name is specified dynamically:
MyObject.methodA()[includeB1 ? "methodB1" : "methodB2"]().methodC()
You could achieve your original goal by defining a method that doesn't do anything except return the same thing that methodB() does. If this is a fluent interface where all the methods just return this, it could be:
doNothing() {
return this;
}
Then you could write:
MyObject.methodA()[includeB ? "methodB" : "doNothing"]().methodC()
But this all seems unnecessarily complex and confusing. Just use ordinary if statements, which express the intent clearly:
let temp = MyObject.methodA();
if (includeB) {
temp = temp.methodB();
}
temp.methodC();