has_dimension           Has dimension?
has_factors             Has factors?
has_missing             Has missing values, NA, NaN, Inf
has_names               Has or lacks names?
has_rownames            Has or lacks row/column names?
is_TRUE                 If TRUE or FALSE
is_class                Is class
is_dataframe            Is data frame
is_decimal              Is decimal
is_diagonal             Is diagonal matrix
is_even                 Is even
is_integer              Is integer
is_matrix               Is matrix
is_multidim             Test if an object is multi-dimensional
is_multiple             Is multiple
is_natural              Is natural
is_negative             Is negative
is_negative_decimal     Is negative decimal
is_negative_integer     Is negative integer
is_odd                  Is even
is_one_dim              Test if an object has one-dimension
is_positive             Is positive
is_positive_decimal     Is positive decimal
is_positive_integer     Is positive integer
is_rectangular_matrix   Is rectangular matrix
is_scalar               Is scalar
is_single               Is single
is_single_decimal       Is single decimal
is_single_even          Is single even
is_single_false         Is single false
is_single_logical       Is single logical
is_single_negative      Is single negative number
is_single_negative_decimal
                        Is single negative decimal
is_single_negative_integer
                        Is single negative integer
is_single_number        Is single number
is_single_odd           Is single odd
is_single_positive      Is single positive number
is_single_positive_decimal
                        Is single positive decimal
is_single_positive_integer
                        Is single positive integer
is_single_string        Is single string
is_single_true          Is single true
is_square_matrix        Is square matrix
is_square_numeric_matrix
                        Is square numeric matrix
is_string               Is string
is_tabular              Is tabular
is_triangular_matrix    Is triangular matrix
is_vector               Is vector
list_of_vectors         List of vectors
list_with_vectors       List with vectors
same_class              Same Class
same_dim                Same Dimension
same_length             Same Length
same_mode               Same Mode
same_nrow               Same Number of Rows / Columns
same_type               Same Type
