check_classes           Check Classes
check_colnames          Check Colnames
check_count             Check Count
check_data              Check Data
check_date              Check Date
check_datetime          Check Date Time
check_environment       Check Environment
check_flag              Check Flag
check_flag_na           Check Flag or NA
check_function          Check Function
check_homogenous        Check Homogenous
check_inherits          Check Inherits
check_join              Check Join
check_key               Check Key
check_length            Check Length
check_length1           Check Length One
check_levels            Check Levels
check_list              Check List
check_missing_colnames
                        Check Missing Colnames
check_missing_names     Check Missing Names
check_named             Check Named
check_names             Check Names
check_nchar             Check Number of Characters
check_ncol              Check Number of Columns
check_nlevels           Check nlevels
check_nrow              Check Number of Rows
check_null              Check NULL
check_number            Check Number
check_pattern           Check Pattern
check_probability       Check Probability
check_regex             Check Matches Regular Expression
check_scalar            Check Scalar
check_sorted            Check Sorted
check_string            Check String
check_tz                Check TimeZone
check_tzone             Check TimeZone
check_unique            Check Unique
check_unnamed           Check Unnamed
check_unused            Check Unused
check_vector            Check Vector
checkor                 Check OR
