CFP - Docs - contains

contains

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

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

Test if a collection contains a value

Try It

const containsC = contains('c')

containsC('abc') // is true
containsC('ab') // is false
containsC(['a', 'b', 'c']) // is true
containsC(['a', 'b', 'cd']) // is false
const containsC = contains('c')

containsC('abc') // is true
containsC('ab') // is false
containsC(['a', 'b', 'c']) // is true
containsC(['a', 'b', 'cd']) // is false

Try It

const containsC = contains('c')

containsC('abc') // is true
containsC('ab') // is false
containsC(['a', 'b', 'c']) // is true
containsC(['a', 'b', 'cd']) // is false
const containsC = contains('c')

containsC('abc') // is true
containsC('ab') // is false
containsC(['a', 'b', 'c']) // is true
containsC(['a', 'b', 'cd']) // is false

We often want to see if a collection contains a value. Below, we see if Chris is in classroom A or B.

Try It

const isChrisPresent = contains('chris')
const classroomA = ['meg', 'tom', 'ken']
const classroomB = ['chris', 'liz', 'phil']

isChrisPresent(classroomA) // is false
isChrisPresent(classroomB) // is true
const isChrisPresent = contains('chris')<string[]>
const classroomA = ['meg', 'tom', 'ken']
const classroomB = ['chris', 'liz', 'phil']

isChrisPresent(classroomA) // is false
isChrisPresent(classroomB) // is true

Try It

const isChrisPresent = contains('chris')
const classroomA = ['meg', 'tom', 'ken']
const classroomB = ['chris', 'liz', 'phil']

isChrisPresent(classroomA) // is false
isChrisPresent(classroomB) // is true
const isChrisPresent = contains('chris')<string[]>
const classroomA = ['meg', 'tom', 'ken']
const classroomB = ['chris', 'liz', 'phil']

isChrisPresent(classroomA) // is false
isChrisPresent(classroomB) // is true