Elixir Language Get the value of a previous command with `v`


Example

iex(1)> a = 10
10
iex(2)> b = 20
20
iex(3)> a + b
30

You can get a specific row passing the index of the row:

iex(4)> v(3)
30

You can also specify an index relative to the current row:

iex(5)> v(-1) # Retrieves value of row (5-1) -> 4
30
iex(6)> v(-5) # Retrieves value of row (5-4) -> 1
10

The value can be reused in other calculations:

iex(7)> v(2) * 4
80

If you specify a non-existing row, IEx will raise an error:

iex(7)> v(100) 
** (RuntimeError) v(100) is out of bounds
    (iex) lib/iex/history.ex:121: IEx.History.nth/2
    (iex) lib/iex/helpers.ex:357: IEx.Helpers.v/1