Function count

  • count<T>(
        iterable: Iterable<T>,
        filterPredicate?: (element: T) => boolean,
    ): number

  • Count the number of elements in an iterable You may optionally provide a predicate function to filter which elements are counted.

    Time complexity: O(n)

    Space complexity: O(1)

    Type Parameters

    • T

    Parameters

    • iterable: Iterable<T>

      The iterable to count the elements of

    • OptionalfilterPredicate: (element: T) => boolean

    Returns number

    The number of elements in iterable. If predicate was provided, the number of elements in iterable that satisfy predicate.

    Example

    count([1, 2, 3]); // 3

    Example

    count([1, 2, 3], number => number % 2 === 1); // 2

    See

    frequencyTable to count the occurrences of all elements in an iterable

    Iterable

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