Variant ⍠
The Variant operator specifies the value of an option to be used by its left operand function.
Examples
('a' ⎕R 'x') 'ABC' ⍝ 'a' replaced with 'x'
ABC
('a' ⎕R 'x' ⍠ 'IC' 1) 'ABC' ⍝ .. Ignoring Case
xBC
IgnCase ← ⍠ 'IC' 1
'a' ⎕R 'x' IgnCase 'ABC'
xBC
The following derived function returns the location of the word 'variant' within its right argument using default values for all the options.
f1 ← 'variant' ⎕S 0
f1 'The variant Variant operator'
4
It may be modified to perform a case-insensitive search:
(f1 ⍠ 1) 'The variant Variant operator'
4 12
This modified function may be named:
f2 ← f1 ⍠ 1
f2 'The variant Variant operator'
4 12
The modified function may itself be modified, in this case to revert to a case sensitive search:
f3 ← f2 ⍠ 0
f3 'The variant Variant operator'
4
This is equivalent to:
(f1 ⍠ 1 ⍠ 0) 'The variant Variant operator'
4