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in-syntax
in-pairs
in-sequence-forever
sequence-lift

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### 35`` 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 ( sequence-lift car seq) ( sequence-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.

Example:

> ( for/list ([x ( sequence-lift add1 ( in-range 10))])
x)

'(1 2 3 4 5 6 7 8 9 10)

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