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once

ts

function once<const T>(
    arr: readonly T[],
    cb: (
        item: T,
        index: number,
        arr: readonly T[]
    ) => boolean
): boolean

Returns true if the callback returns true once. Returns false otherwise.

Example

ts

arr.once(
    ['Axl', 'Slash', 'Duff', 'Buckethead'],
    item => item === 'Roses'
) // false
arr.once(
    ['Axl', 'Slash', 'Duff', 'Buckethead'],
    item => item === 'Buckethead'
) // true
arr.once(
    ['Axl', 'Slash', 'Duff', 'Buckethead'],
    item => item.length > 2
) // false