Get last value in IEx

REPLs often provide a way to access the last processed value, in the Chrome Dev Tools, it's $_, in the Node.js or Ruby REPLs, it's _. In IEx, the last processed value is retrieved by v/0:

iex(1)> 1
iex(2)> v
iex(3)> v |> Kernel.+(1)

Additionally, there is v/1 to retrieve the nth value from history. In IEX, use h/0 or h/1 for more details.

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