[Macro]

(sv+ object slot amount)

Increments the value of slot in object by amount, where slot is either the unquoted symbol or keyword name of a slot in object. Returns the incremented value.

Examples:

(define m (new midi :time 0 :duration 2 :keynum 60))

(sv+ m :duration (between .2 .5))
⇒ 2.4461563
(sv+ m :keynum -12)
⇒ 48

See also:

• fold-objects [Function]
• map-objects [Function]
• subobjects [Function]
• sv [Macro]
• sv* [Macro]