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Guile Reference Manual

14.3.2 Using the Guile REPL

If you start Guile without specifying a particular program for it to execute, Guile enters its standard Read Evaluate Print Loop -- or REPL for short. In this mode, Guile repeatedly reads in the next Scheme expression that the user types, evaluates it, and prints the resulting value.

The REPL is a useful mechanism for exploring the evaluation behaviour described in the previous subsection. If you type string-append, for example, the REPL replies #<primitive-procedure string-append>, illustrating the relationship between the variable string-append and the procedure value stored in that variable.

In this manual, the notation => is used to mean "evaluates to". Wherever you see an example of the form

expression => result

feel free to try it out yourself by typing expression into the REPL and checking that it gives the expected result.