How to slice an object in JavaScript?

To slice an object in JavaScript, we use the Object.entries and Object.fromEntries methods.

For instance, we write

const obj = {
  0: "zero",
  1: "one",
  2: "two",
  3: "three",
  4: "four",
};
const res = Object.fromEntries(Object.entries(obj).slice(0, 4));

to call Object.entries with obj to return an array of key-value pair arrays in obj.

Then we call slice to return a slice of the key-value pair array we want.

And then we call Object.fromEntries with the sliced array to convert it back to an object.