prepend ( seq1 seq2 -- newseq )
Factor handbook » The language » Collections » Sequence operations » Appending sequences

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Vocabulary
sequences

Inputs

seq1	a sequence
seq2	a sequence

Outputs

newseq

a sequence

Word description
Outputs a new sequence of the same type as seq1 consisting of the elements of seq2 followed by seq1.

Errors
Throws an error if seq2 contains elements not permitted in sequences of the same class as seq1.

Examples

USING: prettyprint sequences ; { 1 2 } B{ 3 4 } prepend .
{ 3 4 1 2 }

USING: prettyprint sequences strings ; "go" "car" prepend .
"cargo"

See also
prepend-as

Definition

USING: kernel ;

IN: sequences

: prepend ( seq1 seq2 -- newseq ) over prepend-as ;