johnkerl · johnkerl · Apr 8, 2026 · Apr 8, 2026
diff --git a/docs/src/manpage.md b/docs/src/manpage.md
@@ -239,8 +239,8 @@ This is simply a copy of what you should see on running `man mlr` at a command p
        capitalize cbrt ceil clean_whitespace collapse_whitespace concat contains cos
        cosh count depth dhms2fsec dhms2sec distinct_count erf erfc every exec exp
        expm1 flatten float floor fmtifnum fmtnum fold format fsec2dhms fsec2hms
-       get_keys get_values gmt2localtime gmt2nsec gmt2sec gssub gsub haskey hexfmt
-       hms2fsec hms2sec hostname index int invqnorm is_absent is_array is_bool
+       get_keys get_values gmt2localtime gmt2nsec gmt2sec gssub gsub haskey hasvalue
+       hexfmt hms2fsec hms2sec hostname index int invqnorm is_absent is_array is_bool
        is_boolean is_empty is_empty_map is_error is_float is_int is_map is_nan
        is_nonempty_map is_not_array is_not_empty is_not_map is_not_null is_null
        is_numeric is_present is_string joink joinkv joinv json_parse json_stringify
@@ -2584,6 +2584,9 @@ This is simply a copy of what you should see on running `man mlr` at a command p
    1mhaskey0m
         (class=collections #args=2) True/false if map has/hasn't key, e.g. 'haskey($*, "a")' or 'haskey(mymap, mykey)', or true/false if array index is in bounds / out of bounds. Error if 1st argument is not a map or array. Note -n..-1 alias to 1..n in Miller arrays.
 
+   1mhasvalue0m
+        (class=collections #args=2) True/false if map/array has/hasn't value, e.g. 'hasvalue($*, "a")' or 'hasvalue(myarray, myvalue)', returns true if the value is present in the collection. Error if 1st argument is not a map or array.
+
    1mhexfmt0m
         (class=conversion #args=1) Convert int to hex string, e.g. 255 to "0xff".
 
@@ -3820,5 +3823,5 @@ This is simply a copy of what you should see on running `man mlr` at a command p
        MIME Type for Comma-Separated Values (CSV) Files, the Miller docsite
        https://miller.readthedocs.io
 
-                                  2026-03-16                         4mMILLER24m(1)
+                                  2026-04-08                         4mMILLER24m(1)
 </pre>
diff --git a/docs/src/manpage.txt b/docs/src/manpage.txt
@@ -218,8 +218,8 @@
        capitalize cbrt ceil clean_whitespace collapse_whitespace concat contains cos
        cosh count depth dhms2fsec dhms2sec distinct_count erf erfc every exec exp
        expm1 flatten float floor fmtifnum fmtnum fold format fsec2dhms fsec2hms
-       get_keys get_values gmt2localtime gmt2nsec gmt2sec gssub gsub haskey hexfmt
-       hms2fsec hms2sec hostname index int invqnorm is_absent is_array is_bool
+       get_keys get_values gmt2localtime gmt2nsec gmt2sec gssub gsub haskey hasvalue
+       hexfmt hms2fsec hms2sec hostname index int invqnorm is_absent is_array is_bool
        is_boolean is_empty is_empty_map is_error is_float is_int is_map is_nan
        is_nonempty_map is_not_array is_not_empty is_not_map is_not_null is_null
        is_numeric is_present is_string joink joinkv joinv json_parse json_stringify
@@ -2563,6 +2563,9 @@
    1mhaskey0m
         (class=collections #args=2) True/false if map has/hasn't key, e.g. 'haskey($*, "a")' or 'haskey(mymap, mykey)', or true/false if array index is in bounds / out of bounds. Error if 1st argument is not a map or array. Note -n..-1 alias to 1..n in Miller arrays.
 
+   1mhasvalue0m
+        (class=collections #args=2) True/false if map/array has/hasn't value, e.g. 'hasvalue($*, "a")' or 'hasvalue(myarray, myvalue)', returns true if the value is present in the collection. Error if 1st argument is not a map or array.
+
    1mhexfmt0m
         (class=conversion #args=1) Convert int to hex string, e.g. 255 to "0xff".
 
@@ -3799,4 +3802,4 @@
        MIME Type for Comma-Separated Values (CSV) Files, the Miller docsite
        https://miller.readthedocs.io
 
-                                  2026-03-16                         4mMILLER24m(1)
+                                  2026-04-08                         4mMILLER24m(1)
diff --git a/docs/src/reference-dsl-builtin-functions.md b/docs/src/reference-dsl-builtin-functions.md
@@ -54,7 +54,7 @@ Operators are listed here along with functions. In this case, the argument count
 
 * [**Arithmetic functions**](#arithmetic-functions):  [bitcount](#bitcount),  [madd](#madd),  [mexp](#mexp),  [mmul](#mmul),  [msub](#msub),  [pow](#pow),  [%](#percent),  [&](#bitwise-and),  [\*](#times),  [\**](#exponentiation),  [\+](#plus),  [\-](#minus),  [\.\*](#dot-times),  [\.\+](#dot-plus),  [\.\-](#dot-minus),  [\./](#dot-slash),  [/](#slash),  [//](#slash-slash),  [<<](#lsh),  [>>](#srsh),  [>>>](#ursh),  [^](#bitwise-xor),  [\|](#bitwise-or),  [~](#bitwise-not).
 * [**Boolean functions**](#boolean-functions):  [\!](#exclamation-point),  [\!=](#exclamation-point-equals),  [!=~](#regnotmatch),  [&&](#logical-and),  [<](#less-than),  [<=](#less-than-or-equals),  [<=>](#<=>),  [==](#double-equals),  [=~](#regmatch),  [>](#greater-than),  [>=](#greater-than-or-equals),  [?:](#question-mark-colon),  [??](#absent-coalesce),  [???](#absent-empty-coalesce),  [^^](#logical-xor),  [\|\|](#logical-or).
-* [**Collections functions**](#collections-functions):  [append](#append),  [arrayify](#arrayify),  [concat](#concat),  [depth](#depth),  [flatten](#flatten),  [get_keys](#get_keys),  [get_values](#get_values),  [haskey](#haskey),  [json_parse](#json_parse),  [json_stringify](#json_stringify),  [leafcount](#leafcount),  [length](#length),  [mapdiff](#mapdiff),  [mapexcept](#mapexcept),  [mapselect](#mapselect),  [mapsum](#mapsum),  [unflatten](#unflatten).
+* [**Collections functions**](#collections-functions):  [append](#append),  [arrayify](#arrayify),  [concat](#concat),  [depth](#depth),  [flatten](#flatten),  [get_keys](#get_keys),  [get_values](#get_values),  [haskey](#haskey),  [hasvalue](#hasvalue),  [json_parse](#json_parse),  [json_stringify](#json_stringify),  [leafcount](#leafcount),  [length](#length),  [mapdiff](#mapdiff),  [mapexcept](#mapexcept),  [mapselect](#mapselect),  [mapsum](#mapsum),  [unflatten](#unflatten).
 * [**Conversion functions**](#conversion-functions):  [boolean](#boolean),  [float](#float),  [fmtifnum](#fmtifnum),  [fmtnum](#fmtnum),  [hexfmt](#hexfmt),  [int](#int),  [joink](#joink),  [joinkv](#joinkv),  [joinv](#joinv),  [splita](#splita),  [splitax](#splitax),  [splitkv](#splitkv),  [splitkvx](#splitkvx),  [splitnv](#splitnv),  [splitnvx](#splitnvx),  [string](#string).
 * [**Hashing functions**](#hashing-functions):  [md5](#md5),  [sha1](#sha1),  [sha256](#sha256),  [sha512](#sha512).
 * [**Higher-order-functions functions**](#higher-order-functions-functions):  [any](#any),  [apply](#apply),  [every](#every),  [fold](#fold),  [reduce](#reduce),  [select](#select),  [sort](#sort).
@@ -437,6 +437,12 @@ haskey  (class=collections #args=2) True/false if map has/hasn't key, e.g. 'hask
 </pre>
 
 
+### hasvalue
+<pre class="pre-non-highlight-non-pair">
+hasvalue  (class=collections #args=2) True/false if map/array has/hasn't value, e.g. 'hasvalue($*, "a")' or 'hasvalue(myarray, myvalue)', returns true if the value is present in the collection. Error if 1st argument is not a map or array.
+</pre>
+
+
 ### json_parse
 <pre class="pre-non-highlight-non-pair">
 json_parse  (class=collections #args=1) Converts value from JSON-formatted string.

diff --git a/man/manpage.txt b/man/manpage.txt
@@ -218,8 +218,8 @@
        capitalize cbrt ceil clean_whitespace collapse_whitespace concat contains cos
        cosh count depth dhms2fsec dhms2sec distinct_count erf erfc every exec exp
        expm1 flatten float floor fmtifnum fmtnum fold format fsec2dhms fsec2hms
-       get_keys get_values gmt2localtime gmt2nsec gmt2sec gssub gsub haskey hexfmt
-       hms2fsec hms2sec hostname index int invqnorm is_absent is_array is_bool
+       get_keys get_values gmt2localtime gmt2nsec gmt2sec gssub gsub haskey hasvalue
+       hexfmt hms2fsec hms2sec hostname index int invqnorm is_absent is_array is_bool
        is_boolean is_empty is_empty_map is_error is_float is_int is_map is_nan
        is_nonempty_map is_not_array is_not_empty is_not_map is_not_null is_null
        is_numeric is_present is_string joink joinkv joinv json_parse json_stringify
@@ -2563,6 +2563,9 @@
    1mhaskey0m
         (class=collections #args=2) True/false if map has/hasn't key, e.g. 'haskey($*, "a")' or 'haskey(mymap, mykey)', or true/false if array index is in bounds / out of bounds. Error if 1st argument is not a map or array. Note -n..-1 alias to 1..n in Miller arrays.
 
+   1mhasvalue0m
+        (class=collections #args=2) True/false if map/array has/hasn't value, e.g. 'hasvalue($*, "a")' or 'hasvalue(myarray, myvalue)', returns true if the value is present in the collection. Error if 1st argument is not a map or array.
+
    1mhexfmt0m
         (class=conversion #args=1) Convert int to hex string, e.g. 255 to "0xff".
 
@@ -3799,4 +3802,4 @@
        MIME Type for Comma-Separated Values (CSV) Files, the Miller docsite
        https://miller.readthedocs.io
 
-                                  2026-03-16                         4mMILLER24m(1)
+                                  2026-04-08                         4mMILLER24m(1)
diff --git a/man/mlr.1 b/man/mlr.1
@@ -2,12 +2,12 @@
 .\"     Title: mlr
 .\"    Author: [see the "AUTHOR" section]
 .\" Generator: ./mkman.rb
-.\"      Date: 2026-03-16
+.\"      Date: 2026-04-08
 .\"    Manual: \ \&
 .\"    Source: \ \&
 .\"  Language: English
 .\"
-.TH "MILLER" "1" "2026-03-16" "\ \&" "\ \&"
+.TH "MILLER" "1" "2026-04-08" "\ \&" "\ \&"
 .\" -----------------------------------------------------------------
 .\" * Portability definitions
 .\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
@@ -267,8 +267,8 @@ asserting_present asserting_string atan atan2 atanh bitcount boolean
 capitalize cbrt ceil clean_whitespace collapse_whitespace concat contains cos
 cosh count depth dhms2fsec dhms2sec distinct_count erf erfc every exec exp
 expm1 flatten float floor fmtifnum fmtnum fold format fsec2dhms fsec2hms
-get_keys get_values gmt2localtime gmt2nsec gmt2sec gssub gsub haskey hexfmt
-hms2fsec hms2sec hostname index int invqnorm is_absent is_array is_bool
+get_keys get_values gmt2localtime gmt2nsec gmt2sec gssub gsub haskey hasvalue
+hexfmt hms2fsec hms2sec hostname index int invqnorm is_absent is_array is_bool
 is_boolean is_empty is_empty_map is_error is_float is_int is_map is_nan
 is_nonempty_map is_not_array is_not_empty is_not_map is_not_null is_null
 is_numeric is_present is_string joink joinkv joinv json_parse json_stringify
@@ -3594,6 +3594,15 @@ gsub("prefix4529:suffix8567", "(....ix)([0-9]+)", "[\e1 : \e2]") gives "[prefix
 .fi
 .if n \{\
 .RE
+.SS "hasvalue"
+.if n \{\
+.RS 0
+.\}
+.nf
+ (class=collections #args=2) True/false if map/array has/hasn't value, e.g. 'hasvalue($*, "a")' or 'hasvalue(myarray, myvalue)', returns true if the value is present in the collection. Error if 1st argument is not a map or array.
+.fi
+.if n \{\
+.RE
 .SS "hexfmt"
 .if n \{\
 .RS 0