CFP - Docs - lessThanOrEqualTo

lessThanOrEqualTo

(right: number) => (left: number) => number

Test whether a number is less than or equal to another

Try It

const lte2 = lessThanOrEqualTo(2)
lte2(2) // is true
lte2(3) // is false
const lte2 = lessThanOrEqualTo(2)
lte2(2) // is true
lte2(3) // is false

Try It

const lte2 = lessThanOrEqualTo(2)
lte2(2) // is true
lte2(3) // is false
const lte2 = lessThanOrEqualTo(2)
lte2(2) // is true
lte2(3) // is false

Sometimes we want to test for thresholds. Below, it's a nice day out, so we're looking for restaurants we can walk to. We'll comfortably walk 1.5 miles, so let's find restaurants in that radius.

Try It

const restaurantsNearMe = {
  'Pizza Johns': 1.2,
  'El Taco': 2.1,
  'Salads Galore': 1.5,
}

const isWalkable = lessThanOrEqualTo(1.5)
const getWalkableRestaurants = compose([keepWhen(isWalkable), Object.keys])

const results = getWalkableRestaurants(restaurantsNearMe)
console.log(results)
// [
//   Pizza Johns
//   Salads Galore
// ]
type Distances = Record<string, number>
const restaurantsNearMe = {
  'Pizza Johns': 1.2,
  'El Taco': 2.1,
  'Salads Galore': 1.5,
}

const isWalkable = lessThanOrEqualTo(1.5)
const getWalkableRestaurants = compose([
  keepWhen(isWalkable)<Distances>,
  Object.keys,
])

const results = getWalkableRestaurants(restaurantsNearMe)
console.log(results)
// [
//   Pizza Johns
//   Salads Galore
// ]

Try It

const restaurantsNearMe = {
  'Pizza Johns': 1.2,
  'El Taco': 2.1,
  'Salads Galore': 1.5,
}

const isWalkable = lessThanOrEqualTo(1.5)
const getWalkableRestaurants = compose([
  keepWhen(isWalkable),
  Object.keys,
])

const results = getWalkableRestaurants(
  restaurantsNearMe
)
console.log(results)
// [
//   Pizza Johns
//   Salads Galore
// ]
type Distances = Record<string, number>
const restaurantsNearMe = {
  'Pizza Johns': 1.2,
  'El Taco': 2.1,
  'Salads Galore': 1.5,
}

const isWalkable = lessThanOrEqualTo(1.5)
const getWalkableRestaurants = compose([
  keepWhen(isWalkable)<Distances>,
  Object.keys,
])

const results = getWalkableRestaurants(
  restaurantsNearMe
)
console.log(results)
// [
//   Pizza Johns
//   Salads Galore
// ]