Frontend Engineer 2

Write an example of the reduce function.
Follow-up: What happens if I don’t pass an initial value?

• What is the Virtual DOM?
• What are Promises and Closures?
• Which hooks have you used so far, and can you answer some related questions?

Machine Coding – The 'Select All' checkbox must be checked when all fruit checkboxes are selected and deselected when any one of them is unchecked.

What is a closure, and write an example. (Learn)

const p1 = () => Promise.resolve("resolve");
const p2 = () => Promise.resolve("resolve p2");

(async function(){
  const res = await p1().then((res) => {
      return p2()
      
  }); 
  console.log(res);
  
  const res2 = await p1().then((res) => {
      p2
  });
  console.log(res2)
}
)();

async function fun() {
   console.log('A', await Promise.resolve("E").then(() => 'W'));
   console.log('B', await Promise.resolve("F").then(() => console.log("H")));
}

fun();

Asked to implement your own connect function in Redux.

Asked about component lifecycle methods. (Learn)
Core Web Vitals – Which factors would you consider to optimise your web app?

Asked to implement a custom setInterval using setTimeout.