CFP - Docs - numberIsBetween

numberIsBetween

(num1: number, num2: number, opts?: Options) => (aNumber: number) => boolean

Test if a number is between two others. Inclusive by default.

Try It

const isOneToFive = numberIsBetween(1, 5)

isOneToFive(1) // is true
isOneToFive(5) // is true
isOneToFive(6) // is false
const isOneToFive = numberIsBetween(1, 5)

isOneToFive(1) // is true
isOneToFive(5) // is true
isOneToFive(6) // is false

Try It

const isOneToFive = numberIsBetween(1, 5)

isOneToFive(1) // is true
isOneToFive(5) // is true
isOneToFive(6) // is false
const isOneToFive = numberIsBetween(1, 5)

isOneToFive(1) // is true
isOneToFive(5) // is true
isOneToFive(6) // is false

We often want to see if a number falls within a range. Below, we see if Amy, Kim, and Grace get the teen discount at the movies.

Try It

const people = {
  amy: {
    age: 19,
  },
  kim: {
    age: 13,
  },
  grace: {
    age: 20,
  },
}

const isTeen = compose([get('age'), numberIsBetween(13, 19)])
const applyTeenDiscount = person => ({
  ...person,
  getsTeenDiscount: isTeen(person),
})

const applyTeenDiscountToAll = mapValues(applyTeenDiscount)
const updatedPeople = applyTeenDiscountToAll(people)
console.log(updatedPeople)
// is {
//   amy: {
//     age: 19,
//     getsTeenDiscount: true,
//   },
//   kim: {
//     age: 13,
//     getsTeenDiscount: true,
//   },
//   grace: {
//     age: 20,
//     getsTeenDiscount: false,
//   },
// }
type Person = {
  age: number
  getsTeenDiscount?: boolean
}
type People = Record<string, Person>
const people: People = {
  amy: {
    age: 19,
  },
  kim: {
    age: 13,
  },
  grace: {
    age: 20,
  },
}

const isTeen = compose([get('age')<Person>, numberIsBetween(13, 19)])
const applyTeenDiscount = (person: Person) => ({
  ...person,
  getsTeenDiscount: isTeen(person),
})

const applyTeenDiscountToAll = mapValues(applyTeenDiscount)<People>
const updatedPeople = applyTeenDiscountToAll(people)
console.log(updatedPeople)
// is {
//   amy: {
//     age: 19,
//     getsTeenDiscount: true,
//   },
//   kim: {
//     age: 13,
//     getsTeenDiscount: true,
//   },
//   grace: {
//     age: 20,
//     getsTeenDiscount: false,
//   },
// }

Try It

const people = {
  amy: {
    age: 19,
  },
  kim: {
    age: 13,
  },
  grace: {
    age: 20,
  },
}

const isTeen = compose([
  get('age'),
  numberIsBetween(13, 19),
])
const applyTeenDiscount = person => ({
  ...person,
  getsTeenDiscount: isTeen(person),
})

const applyTeenDiscountToAll = mapValues(
  applyTeenDiscount
)
const updatedPeople =
  applyTeenDiscountToAll(people)
console.log(updatedPeople)
// is {
//   amy: {
//     age: 19,
//     getsTeenDiscount: true,
//   },
//   kim: {
//     age: 13,
//     getsTeenDiscount: true,
//   },
//   grace: {
//     age: 20,
//     getsTeenDiscount: false,
//   },
// }
type Person = {
  age: number
  getsTeenDiscount?: boolean
}
type People = Record<string, Person>
const people: People = {
  amy: {
    age: 19,
  },
  kim: {
    age: 13,
  },
  grace: {
    age: 20,
  },
}

const isTeen = compose([
  get('age')<Person>,
  numberIsBetween(13, 19),
])
const applyTeenDiscount = (person: Person) => ({
  ...person,
  getsTeenDiscount: isTeen(person),
})

const applyTeenDiscountToAll = mapValues(
  applyTeenDiscount
)<People>
const updatedPeople =
  applyTeenDiscountToAll(people)
console.log(updatedPeople)
// is {
//   amy: {
//     age: 19,
//     getsTeenDiscount: true,
//   },
//   kim: {
//     age: 13,
//     getsTeenDiscount: true,
//   },
//   grace: {
//     age: 20,
//     getsTeenDiscount: false,
//   },
// }