+# List operations
+
+filter: "${filter{a:b:c}{eq{1}{1}}}"
+filter: ${filter{a:b:c}{!eq{$item}{b}}}
+filter: ${filter{<' a'b'c}{!eq{$item}{b}}}
+filter: ${filter{<' ''a'b' ''c}{!eq{$item}{b}}}
+filter: "${filter{}{!eq{$item}{b}}}"
+
+map: "${map{}{$item}}"
+map: ${map{a:b:c}{$item}}
+map: ${map{a:b:c}{:$item:}}
+map: ${if eq{1}{0}{${map{a:b:c}{:$item:}}}{fail string}}
+map: ${map{:b:c}{[$item]}}
+
+reduce: "${reduce{}{+}{$value$item}}"
+reduce: ${reduce{a:b:c}{+}{$value$item}}
+reduce: ${reduce {<, 1,2,3}{0}{${eval:$value+$item}}}
+reduce: ${reduce {3:0:9:4:6}{0}{${if >{$item}{$value}{$item}{$value}}}}
+