The JavaScript Interview Handbook: 100+ Interview Questions/

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Challenge: Let's Add Properties

Challenge: Let's Add Properties

This lesson will test your understanding of pure, impure, and arrow functions in JavaScript.

We'll cover the following...

Problem statement #

Study the code below and then run it.

Javascript (babel-node)
const func = (key, value, object) => {
  object[key] = value;
};
function test() {
  const car = {
    name: "Toyota"
  };
  const answer = func("model", 88, car);
  console.log({ car, answer });
}
test();

func is an impure function. The reasoning ...