CFP - Docs - containedIn

containedIn

(collection: string) => (value: string) => boolean

(collection: Collection) => (value: any) => boolean

Test if a value is contained in a collection

Try It

const containedInAB = containedIn(['a', 'b'])

containedInAB('a') // is true
containedInAB('c') // is false
const containedInAB = containedIn(['a', 'b'])

containedInAB('a') // is true
containedInAB('c') // is false

Try It

const containedInAB = containedIn(['a', 'b'])

containedInAB('a') // is true
containedInAB('c') // is false
const containedInAB = containedIn(['a', 'b'])

containedInAB('a') // is true
containedInAB('c') // is false

We often want to see if a value is in a collection. Below, we see if a student is in the classroom.

Try It

const studentsInClass = ['meg', 'tom', 'ken']
const isPresent = containedIn(studentsInClass)

isPresent('meg') // is true
isPresent('chris') // is false
const studentsInClass = ['meg', 'tom', 'ken']
const isPresent = containedIn(studentsInClass)

isPresent('meg') // is true
isPresent('chris') // is false

Try It

const studentsInClass = ['meg', 'tom', 'ken']
const isPresent = containedIn(studentsInClass)

isPresent('meg') // is true
isPresent('chris') // is false
const studentsInClass = ['meg', 'tom', 'ken']
const isPresent = containedIn(studentsInClass)

isPresent('meg') // is true
isPresent('chris') // is false