CFP - Docs - isAfter

isAfter

(date1: date) => (date2: date) => boolean

Test if a date is after another

Try It

const janFirst2025 = new Date('2025 1 1')
const isAfterJanFirst2025 = isAfter(janFirst2025)

const now = new Date()
isAfterJanFirst2025(now) // is true

const decFirst2024 = new Date('2024 12 1')
isAfterJanFirst2025(decFirst2024) // is false
const janFirst2025 = new Date('2025 1 1')
const isAfterJanFirst2025 = isAfter(janFirst2025)

const now = new Date()
isAfterJanFirst2025(now) // is true

const decFirst2024 = new Date('2024 12 1')
isAfterJanFirst2025(decFirst2024) // is false

Try It

const janFirst2025 = new Date('2025 1 1')
const isAfterJanFirst2025 = isAfter(janFirst2025)

const now = new Date()
isAfterJanFirst2025(now) // is true

const decFirst2024 = new Date('2024 12 1')
isAfterJanFirst2025(decFirst2024) // is false
const janFirst2025 = new Date('2025 1 1')
const isAfterJanFirst2025 = isAfter(janFirst2025)

const now = new Date()
isAfterJanFirst2025(now) // is true

const decFirst2024 = new Date('2024 12 1')
isAfterJanFirst2025(decFirst2024) // is false

Sometimes we need to compare dates. Below, it's fridge cleaning time. Let's keep the items that are still good.

Try It

const now = new Date('2025 1 15')

const fridge = {
  milk: {
    goodUntil: new Date('2025 1 12'),
  },
  eggs: {
    goodUntil: new Date('2025 1 16'),
  },
}

const isStillGood = compose([get('goodUntil'), isAfter(now)])

const clean = keepWhen(isStillGood)
const freshFridge = clean(fridge)
console.log(freshFridge)
// is {
//   eggs: {
//     goodUntil: 2025 1 16
//   }
// }
const now = new Date('2025 1 15')

type Perishable = { goodUntil: Date }
type Fridge = Record<string, Perishable>
const fridge: Fridge = {
  milk: {
    goodUntil: new Date('2025 1 12'),
  },
  eggs: {
    goodUntil: new Date('2025 1 16'),
  },
}

const isStillGood = compose([get('goodUntil')<Perishable>, isAfter(now)])

const clean = keepWhen(isStillGood)<Fridge>
const freshFridge = clean(fridge)
console.log(freshFridge)
// is {
//   eggs: {
//     goodUntil: 2025 1 16
//   }
// }

Try It

const now = new Date('2025 1 15')

const fridge = {
  milk: {
    goodUntil: new Date('2025 1 12'),
  },
  eggs: {
    goodUntil: new Date('2025 1 16'),
  },
}

const isStillGood = compose([
  get('goodUntil'),
  isAfter(now),
])

const clean = keepWhen(isStillGood)
const freshFridge = clean(fridge)
console.log(freshFridge)
// is {
//   eggs: {
//     goodUntil: 2025 1 16
//   }
// }
const now = new Date('2025 1 15')

type Perishable = { goodUntil: Date }
type Fridge = Record<string, Perishable>
const fridge: Fridge = {
  milk: {
    goodUntil: new Date('2025 1 12'),
  },
  eggs: {
    goodUntil: new Date('2025 1 16'),
  },
}

const isStillGood = compose([
  get('goodUntil')<Perishable>,
  isAfter(now),
])

const clean = keepWhen(isStillGood)<Fridge>
const freshFridge = clean(fridge)
console.log(freshFridge)
// is {
//   eggs: {
//     goodUntil: 2025 1 16
//   }
// }