quickref

Control Flow Macros

These macros aid in control flow in some way and do not change change the threaded topic.

   (->/do t form*)

   (->/if t then-form else-form)
   (->/if-let t [bind-pair] then-form else-form)
   (->/cond t test1 form1, test2 form2, ...) 

   (->/when t expr form*)
   (->/when-let t [binding] form*)
   (->/when-not t expr form*)

   (->/let t [bind-pairs*] form*)
   (->/for t [bind-pairs*] form*)

Updater Macros

These macros make it convenient to update a part of the overall topic by threading just that part through their body.

   (->/update t key1 form1, key2 form2, ...)
   (->/in t [path] form*)

   (->/first t form*)
   (->/second t form*)
   (->/nth t form*)
   (->/last t form*)

   (->/take t form*)
   (->/drop t form*)
   (->/butlast t form*)
   (->/rest t form*)

   (->/each t form*)
   (->/each-as t binding form*)

Supporting Macros and Functions

These macros and functions are to it convenient to define and debug threaded forms.

   (->/reset t value) ; replace t with value 
   (->/apply t f arg*)
   (->/aside t form*)
   (->/as t binding form*)
   (->/fn [] form*)

Accessing the current topic with <>

It is possible to refer to the current value of the threaded topic by any form in the above macros by using the variable: <>. In addition, two special binding macros are available inside any synthread macros with a binding area. These are useful for doing two things with the current topic: updating it and binding value of the topic either after the update or before it.

   (->/upget key updating-form getting-form)
   (->/getup key getting-form updating-form)