Interview Questions

Question

What is hoisting in javascript?

Answer

Hoisting is JavaScript's default behavior of moving all declarations to the top of the current scope (to the top of the current script or the current function).

Hoisting is the mechanism of moving the variables and functions declaration to the top of the function scope (or global scope if outside any function).

• https://dmitripavlutin.com/simple-but-tricky-javascript-interview-questions/

• https://dmitripavlutin.com/javascript-hoisting-in-details/

Question

Write a function to reverse a hashmap/object. so set the values as properties and properties as values

Answer

const j = {
 a: "a1",
 b: "b2",
 c: "c3"
}

const y = Object.keys(j).reduce((a, c) => {
 a[j[c]] = c;
 return a;
}, {});