Is there a setting page on the lemmy instance where I can download all my data?
https://www.bbc.com/news/world-asia-india-66844028
Four months after it was torn apart by deadly ethnic violence, Manipur remains gripped by fear.
I have been reading this book "Modern Javascript for the Impatient", chapter "Object-Oriented Programming". At the end there is an "Exercise" section. This is a question from it I need help answering:
Harry tries this code to toggle a CSS class when a button is clicked:
const button = document.getElementById('button1')
button.addEventListener('click', function () {
this.classList.toggle('clicked')
})
It doesn’t work. Why?
Sally, after searching the wisdom of the Internet, suggests:
button.addEventListener('click', event => {
event.target.classList.toggle('clicked')
})
This works, but Harry feels it is cheating a bit. What if the listener hadn’t produced the button as event.target? Fix the code so that you use neither this nor the event parameter.
I have been reading a book on JS. This is one of the questions at the end of a chapter that stumped me; don't know where to begin. So please help me out:
Question
A classic example for an abstract class is a tree node. There are two kinds of nodes: those with children (parents) and those without (leaves).
class Node {
depth() { throw Error("abstract method") }
}
class Parent extends Node {
constructor(value, children) { . . . }
depth() { return 1 + Math.max(...children.map(n => n.depth())) }
}
class Leaf extends Node {
constructor(value) { . . . }
depth() { return 1 }
}
This is how you would model tree nodes in Java or C++. But in JavaScript, you don’t need an abstract class to be able to invoke n.depth().
Rewrite the classes without inheritance and provide a test program.
So, how to write this code without using inheritance in JS?
@2br02b
@lemmy.ml