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15 Sequences

Sam Tobin-Hochstadt <samth@ccs.neu.edu>

 (require unstable/sequence)

This library is unstable ; compatibility will not be maintained. See Unstable for more information.

(in-syntax stx) → sequence?
  stx : syntax?
Produces a sequence equivalent to (syntax->list lst).
An in-syntax application can provide better performance for syntax iteration when it appears directly in a for clause.

Example:

  > (for/list ([x (in-syntax #'(1 2 3))])
      x)

  (#<syntax:2:0 1> #<syntax:2:0 2> #<syntax:2:0 3>)

(in-pairs seq) → sequence?
  seq : sequence?
Produces a sequence equivalent to (in-parallel (lift car seq) (lift cdr seq)).

(in-sequence-forever seq val) → sequence?
  seq : sequence?
  val : any/c
Produces a sequence whose values are the elements of seq, followed by val repeated.

(sequence-lift f seq) → sequence?
  f : procedure?
  seq : sequence?
Produces the sequence of f applied to each element of seq.

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