###Make |, & and ^ built-ins do something useful on blocks###

E.g. <array/string> <block> | can be used as index function

[0 -10 -20 30 40 -50 60] {0<} |   # -> [1 2 5]

Any ideas for <array/string> <block> & or <array/string> <block> ^?

Make |, & and ^ built-ins do something useful on blocks

E.g. <array/string> <block> | can be used as index function

[0 -10 -20 30 40 -50 60] {0<} |   # -> [1 2 5]

Any ideas for <array/string> <block> & or <array/string> <block> ^?

###Make | and & builtin doing something useful on blocks###

E.g. <array/string> <block> | can be used as index function

[0 -10 -20 30 40 -50 60] {0<} |   # -> [1 2 5]

Any ideas for <array/string> <block> &?

###Make |, & and ^ built-ins do something useful on blocks###

E.g. <array/string> <block> | can be used as index function

[0 -10 -20 30 40 -50 60] {0<} |   # -> [1 2 5]

Any ideas for <array/string> <block> & or <array/string> <block> ^?