vector-for-each - loop over the elements of a vector

(import (rnrs))                     ;R6RS
(import (rnrs base))                ;R6RS
(import (scheme base))              ;R7RS

(vector-for-each proc vector1 vector2 ...)

Applies proc element-wise to the elements of the vectors for its side effects, in order from the first elements to the last.

R6RS

The procedure proc is always called in the same dynamic environment as vector-for-each itself.

The implementation must check the restrictions on proc to the extent performed by applying it as described. An implementation may check whether proc is an appropriate argument before applying it.

R7RS

If more than one vector is given and not all vectors have the same length, vector-for-each terminates when the shortest vector runs out.

(vector-for-each
  display
  '#("Hello, " "world" ".\n"))
; prints: Hello, world.

R7RS says that this procedure and a few others were added in order to round out the sequence operations.

The R7RS variant of this procedure terminates early if the vectors are not the same length, but the R6RS variant requires that all the vectors are the same length. Additionally R7RS makes it an error to mutate any of the vectors.

This procedure can raise exceptions with the following condition types:

&assertion (R6RS)

The wrong number of arguments was passed or an argument was outside its domain. In particular, the vectors should all have the same length and proc should accept as many arguments are there are vectors.

R7RS

The assertions described above (except for the length requirement) are errors. Implementations may signal an error, extend the procedure's domain of definition to include such arguments, or fail catastrophically.

It is an error for proc to mutate any of the vectors.

for-each(3scm), vector-map(3scm)

R6RS, R7RS

This procedure first appeared in R6RS. It was later also added to R7RS.

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