roll

Input Stack: N a0 ... aN

⇨

Output Stack: aN-1 a0 ... aN-2 aN

Rotate an item in the stack and put it on the top.

Since: 1.5.0

Example:

a,0,:roll

Pos	Input	Output
0	0	a
1	a

a,b,0,:roll

Pos	Input	Output
0	0	b
1	b	a
2	a

a,b,1,:roll

Pos	Input	Output
0	1	a
1	b	b
2	a