Normally you are not supposed to mess with the prototype of built-in types but here is a hack/shortcut:

Object.defineProperty(Array.prototype, 'last', {
  get() {
    return this[this.length - 1]; 
  }
});

This will allow all array objects to have a last property, which you can use like so:

const letters = ['a', 'b', 'c', 'd', 'e'];
console.log(letters.last); // 'e'

You are not supposed to mess with a built-in type's prototype because you never when a new ES version will be released and in the event that a new version uses the same property name as your custom property, all sorts of breaks can happen. You COULD make the property to something that you know an ES version would, like lastItem but that is at the discretion of the developer.

Or you can use a simple method:

const getLast = (list) => list[list.length - 1];
const last = getLast([1,2,3]); // returns 3

Normally you are not supposed to mess with the prototype of built-in types but here is a hack/shortcut:

Object.defineProperty(Array.prototype, 'last', {
  get() {
    return this[this.length - 1]; 
  }
});

This will allow all array objects to have a last property, which you can use like so:

const letters = ['a', 'b', 'c', 'd', 'e'];
console.log(letters.last); // 'e'

You are not supposed to mess with a built-in type's prototype because you never when a new ES version will be released and in the event that a new version uses the same property name as your custom property, all sorts of breaks can happen. Also, it makes it hard for others to follow your code, especially for people joining the team. You COULD make the property to something that you know an ES version would never use, like listLastItem but that is at the discretion of the developer.

Or you can use a simple method:

const getLast = (list) => list[list.length - 1];
const last = getLast([1,2,3]); // returns 3

Normally you are not supposed to mess with the prototype of built-in types but here is a hack/shortcut:

Object.defineProperty(Array.prototype, 'last', {
  get() {
    return this[this.length - 1]; 
  }
});

This will allow all array objects to have a last property, which you can use like so:

const letters = ['a', 'b', 'c', 'd', 'e'];
console.log(letters.last); // 'e'

You are not supposed to mess with a built-in type's prototype because you never when a new ES version will be released and in the event that a new version uses the same property name as your custom property, all sorts of breaks can happen. You COULD make the property to something that you know an ES version would, like lastItem but that is at the discretion of the developer.

Normally you are not supposed to mess with the prototype of built-in types but here is a hack/shortcut:

Object.defineProperty(Array.prototype, 'last', {
  get() {
    return this[this.length - 1]; 
  }
});

This will allow all array objects to have a last property, which you can use like so:

const letters = ['a', 'b', 'c', 'd', 'e'];
console.log(letters.last); // 'e'

You are not supposed to mess with a built-in type's prototype because you never when a new ES version will be released and in the event that a new version uses the same property name as your custom property, all sorts of breaks can happen. You COULD make the property to something that you know an ES version would, like lastItem but that is at the discretion of the developer.

Or you can use a simple method:

const getLast = (list) => list[list.length - 1];
const last = getLast([1,2,3]); // returns 3