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The JavaScript Interview Handbook: 100+ Interview Questions

Solution Review: Let's Add Properties

This lesson will explain the solution to the problem in the previous lesson.

We'll cover the following...

Solution #

Node.js
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()

Explanation #

In this challenge, you had to convert the following impure function into a pure function.

Node.js
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()

As you can see, the function updates ...