CFP - Docs - last

last

```
(sequence: Sequence) => Value
```

Return the last item in a sequence

last(['a', 'b', 'c']) // is 'c'
last('abc') // is 'c'
last('') // is undefined
last(['a', 'b', 'c']) // is 'c'
last('abc') // is 'c'
last('') // is undefined

Try It

last(['a', 'b', 'c']) // is 'c'
last('abc') // is 'c'
last('') // is undefined
last(['a', 'b', 'c']) // is 'c'
last('abc') // is 'c'
last('') // is undefined

Sometimes we have sorted data and only care about the last item. Below, we noticed the Harry Potter book wasn't at our library. Let's find the last person to check it out so we can follow up with them.

Try It

const harryPotterCheckouts = [
  {
    name: 'jen',
    checkedOut: '2025-01-05',
    returned: '2025-02-02',
  },
  {
    name: 'mike',
    checkedOut: '2025-02-06',
    returned: '2025-02-25',
  },
  {
    name: 'luke',
    checkedOut: '2025-03-01',
  },
]

const { name } = last(harryPotterCheckouts)
console.log(name)
// is luke
type Checkout = {
  name: string
  checkedOut: string
  returned?: string
}

const harryPotterCheckouts: Checkout[] = [
  {
    name: 'jen',
    checkedOut: '2025-01-05',
    returned: '2025-02-02',
  },
  {
    name: 'mike',
    checkedOut: '2025-02-06',
    returned: '2025-02-25',
  },
  {
    name: 'luke',
    checkedOut: '2025-03-01',
  },
]

const { name } = last(harryPotterCheckouts) as Checkout
console.log(name)
// is luke

Try It

const harryPotterCheckouts = [
  {
    name: 'jen',
    checkedOut: '2025-01-05',
    returned: '2025-02-02',
  },
  {
    name: 'mike',
    checkedOut: '2025-02-06',
    returned: '2025-02-25',
  },
  {
    name: 'luke',
    checkedOut: '2025-03-01',
  },
]

const { name } = last(harryPotterCheckouts)
console.log(name)
// is luke
type Checkout = {
  name: string
  checkedOut: string
  returned?: string
}

const harryPotterCheckouts: Checkout[] = [
  {
    name: 'jen',
    checkedOut: '2025-01-05',
    returned: '2025-02-02',
  },
  {
    name: 'mike',
    checkedOut: '2025-02-06',
    returned: '2025-02-25',
  },
  {
    name: 'luke',
    checkedOut: '2025-03-01',
  },
]

const { name } = last(
  harryPotterCheckouts
) as Checkout
console.log(name)
// is luke