random-lines ( n -- lines )

Vocabulary

io.random

Inputs

n

an object

Outputs

lines

an object

Definition

USING: io.random.private kernel math random sequences
sequences.private ;

IN: io.random

:: random-lines ( n -- lines )
    V{ } clone :> accum [| line line# |
        line# n <=
        [ line accum push ] [
            line# random :> r r n <
            [ line r accum set-nth-unsafe ] when
        ] if
    ] each-numbered-line accum ;