urbit/base/pub/doc/hoon/runes/ts/tscl.md

tiscol, =:, %tscl

Batch change subject

=: is a synthetic hoon that produces q with the subject modified by the list of changes in p which must be terminated by a ==. =: is useful when you need to make a batch of changes to your subject.

See also

tisdot, =., %tsdt

Produces

Twig: [%tscl p=tram q=twig]

Sample

p is a ++tram, a list of ++wings and twigs. q is a twig.

Tall form

=:  p.i.p      q.i.p
    p.i.t.p    q.i.t.p
    p.i.t.t.p  q.i.t.t.p
  ==
  q

Wide form

None

Irregular form

None

Examples

~zod/try=> =+  a=[b=1 c=2]
           =:  c.a  4
               b.a  3
             ==
           a
[b=3 c=4]

Here we add a simple cell with faces to our subject, a=[b=1 c=2] and make a set of changes to it using =:.