Main> Define a new value.

First, declare the type of your new value, e.g.
  :let myValue : List Nat

Then, define the value:
  :let myValue = [1, 2, 3]

Now the value is in scope at the REPL:
  > map (+ 2) myValue
  [3, 4, 5]
Main> Define a new value.

First, declare the type of your new value, e.g.
  :let myValue : List Nat

Then, define the value:
  :let myValue = [1, 2, 3]

Now the value is in scope at the REPL:
  > map (+ 2) myValue
  [3, 4, 5]
Main> Define a new value.

First, declare the type of your new value, e.g.
  :let myValue : List Nat

Then, define the value:
  :let myValue = [1, 2, 3]

Now the value is in scope at the REPL:
  > map (+ 2) myValue
  [3, 4, 5]
Main> Define a new value.

First, declare the type of your new value, e.g.
  :let myValue : List Nat

Then, define the value:
  :let myValue = [1, 2, 3]

Now the value is in scope at the REPL:
  > map (+ 2) myValue
  [3, 4, 5]
Main> 
Bye for now!