anchor.diff:  }
   ----
   
  -== Limiting concurrent parallel Transforming and traversing collections using workers
  -
  -+s_mach.concurrent+ allows specifying the maximum number of simultaneous workers.
  +== Limiting the maximum number of simultaneous workers used during concurrent parallel operations
  +
  ++s_mach.concurrent+ allows specifying the maximum number of simultaneous workers used during concurrent parallel
  +operations
   
   .Example 3: Using +s_mach.concurrent+ workers to transform and traverse collections:
   [source,scala,numbered]
  
positive.code: ----
  
  == Concurrently transform or traverse collections
  A common task when working with futures is transforming or traversing a collection that will call a method that
  returns a future. The standard methods provided can, with enough nesting, leads to difficult to read code:
  
  .Example 1: Transform and traverse collections, standard method
  [source,scala,numbered]
  
negative.code: 
  The same code, rewritten using +s_mach.concurrent+:
  
  .Example 2: Using +s_mach.concurrent+ to transform and traverse collections:
  [source,scala,numbered]
  ----
  val oomItemIdBatch = (1 to 10).toList.map(_.toString).grouped(2).toList
  