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    ReQL command: count

    Command syntax

    sequence.count([value | predicate_function]) → number

    binary.count() → number

    string.count() → number

    object.count() → number

    r.count(sequence | binary | string | object[, predicate_function]) → number

    Description

    Counts the number of elements in a sequence or key/value pairs in an object, or returns the size of a string or binary object.

    When count is called on a sequence with a predicate value or function, it returns the number of elements in the sequence equal to that value or where the function returns true. On a binary object, count returns the size of the object in bytes; on strings, count returns the string’s length. This is determined by counting the number of Unicode codepoints in the string, counting combining codepoints separately.

    Example: Count the number of users.

    r.table('users').count().run(conn)
    

    Example: Count the number of 18 year old users.

    r.table('users')['age'].count(18).run(conn)
    

    Example: Count the number of users over 18.

    r.table('users')['age'].count{ |age| age > 18 }.run(conn)
    

    Alternatively:

    r.table('users').count{ |user| user['age'] > 18 }.run(conn)
    

    Example: Return the length of a Unicode string.

    > r.expr("こんにちは").count().run(conn)
    5
    

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