eimfach

// Promise.all is good for executing many promises at once
Promise.all([
  promise1,
  promise2
]);

// Promise.resolve is good for wrapping synchronous code
Promise.resolve().then(function () {
  if (somethingIsNotRight()) {
    throw new Error("I will be rejected asynchronously!");

eimfach

What forces layout / reflow

All of the below properties or methods, when requested/called in JavaScript, will trigger the browser to synchronously calculate the style and layout*. This is also called reflow or layout thrashing, and is common performance bottleneck.

Element

Box metrics

• elem.offsetLeft, elem.offsetTop, elem.offsetWidth, elem.offsetHeight, elem.offsetParent
• elem.clientLeft, elem.clientTop, elem.clientWidth, elem.clientHeight
• elem.getClientRects(), elem.getBoundingClientRect()

eimfach

https://www.youtube.com/watch?v=TMuno5RZNeE

Encapsulation ?

• OO weaken encapsulation by introducing private, public, protected

Inheritance ?

• why Java doesn't have inheritance ? Diamond problem

Polymorphism

• https://medium.com/@shanikae/polymorphism-explained-simply-7294c8deeef7