Returns the value of the nth expression in the history.

n can be a negative value: if it is, the corresponding expression value relative to the current one is returned. For example, v(-2) returns the value of the expression evaluated before the last evaluated expression. In particular, v(-1) returns the result of the last evaluated expression and v() does the same.

Examples

iex(1)> "hello" <> " world"
"hello world"
iex(2)> 40 + 2
42
iex(3)> v(-2)
"hello world"
iex(4)> v(2)
42
iex(5)> v()
42