Bind

is a primitive operator. It shares the glyph  with Beside. It can only be called monadically.

Called with an array left operand  and function right operand ,   is equivalent to.

Called with a function left operand  and array right operand ,   is equivalent to.

Common usage
Bind is used to create a derived function with a single constant argument, particularly in tacit programming: Try it online!

Lessons

 * APL Cultivation

Documentation

 * Dyalog