CFP - Docs - getSize

getSize

(collection: Collection | string) => number

Return the size of the collection

Try It

getSize([1, 2, 3]) // is 3
getSize('123') // is 3
getSize({ a: 1, b: 2, c: 3 }) // is 3
getSize([1, 2, 3]) // is 3
getSize('123') // is 3
getSize({ a: 1, b: 2, c: 3 }) // is 3

Try It

getSize([1, 2, 3]) // is 3
getSize('123') // is 3
getSize({ a: 1, b: 2, c: 3 }) // is 3
getSize([1, 2, 3]) // is 3
getSize('123') // is 3
getSize({ a: 1, b: 2, c: 3 }) // is 3

Sometimes we need the size of a collection. Below, we're planning a field trip and need the total number of students. Let's get the size of each class and sum them.

Try It

const classrooms = {
  A: ['grace', 'sam', 'jen'],
  B: ['mike', 'luke', 'emma', 'meg'],
}

const getClassroomSizes = mapValues(getSize)
const getNumStudents = compose([getClassroomSizes, sumValues])
const numStudents = getNumStudents(classrooms)
console.log(numStudents)
// is 7
type Classrooms = Record<string, string[]>
const classrooms = {
  A: ['grace', 'sam', 'jen'],
  B: ['mike', 'luke', 'emma', 'meg'],
}

const getClassroomSizes = mapValues(getSize<string[]>)<Classrooms>
const getNumStudents = compose([getClassroomSizes, sumValues])
const numStudents = getNumStudents(classrooms)
console.log(numStudents)
// is 7

Try It

const classrooms = {
  A: ['grace', 'sam', 'jen'],
  B: ['mike', 'luke', 'emma', 'meg'],
}

const getClassroomSizes = mapValues(getSize)
const getNumStudents = compose([
  getClassroomSizes,
  sumValues,
])
const numStudents = getNumStudents(classrooms)
console.log(numStudents)
// is 7
type Classrooms = Record<string, string[]>
const classrooms = {
  A: ['grace', 'sam', 'jen'],
  B: ['mike', 'luke', 'emma', 'meg'],
}

const getClassroomSizes = mapValues(
  getSize<string[]>
)<Classrooms>
const getNumStudents = compose([
  getClassroomSizes,
  sumValues,
])
const numStudents = getNumStudents(classrooms)
console.log(numStudents)
// is 7