Source code in the langur programming language

.x()
# call user-defined function

write(.key, ": ", .value)
# call built-in with parentheses

write .key, ": ", .value
# call built-in with unbounded list

writeln "numbers: ", join ", ", [.a1, .a2, .a3, .a4]
# unbounded lists on writeln and join
# later function join takes remaining arguments

writeln "numbers: ", join(", ", [.a1, .a2, .a3, .a4]), " === "
# unbounded list on writeln
# join using parentheses so it doesn't take remaining arguments

val .sum = foldfrom(
    f(.sum, .i, .c) .sum + toNumber(.c, 36) x .weight[.i],
    0,
    pseries len .code,
    split ZLS, .code,
)
# split, pseries, and len using unbounded lists, ending before comma preceding line return

for .key in sort(keys .tests) {
    ...
}
# unbounded list on keys bounded by closing parenthesis of sort