← — AssignN←Y binds a name to an array, function or operator. Chained assignment returns the assigned value silently.
x←3 ⋄ x+2 ⍝ 5
sum←+/ ⋄ sum 1 2 3 ⍝ 6
N f←Y updates with N f Y. Bracket and selective forms update selected items.
x←10 ⋄ x+←3 ⋄ x ⍝ 13
x←1 2 3 ⋄ x[2]←9 ⋄ x ⍝ 1 9 3
x←1 2 3 ⋄ (2↑x)←8 9 ⋄ x ⍝ 8 9 3
Strands assign corresponding items.
(a b)←10 20 ⋄ a+b ⍝ 30
Inside dfns, plain assignment is local. Modified/indexed/selective array updates target the nearest existing binding. Arrays have value semantics.