Getting Started with Io

map

Io> list(10, 11, 12, 13, 14, 15) map(asHex)
==> list(0a, 0b, 0c, 0d, 0e, 0f)

Regex with capturing

Io> "<code:io>" matchesOfRegex("<code:([a-z]+)>") at(0) captures
==> list(<code:io>, io)

Runing an external process

Io> rc := System runCommand ("ls")
Io> rc slotNames
==> list(exitStatus, succeeded, stdout, successStatus, failed, stderr)

Async message

Io> long_method := method(
...   System sleep(5)
...   "done"
... )
==> method(
    System sleep(5) "done"
)
Io> foo := @long_method; nil
==> nil
Io> foo
==> done
done

Boolean Expressions

x := 5
y := 9
if((x == 3) or (y == 9), true, false)

Constructors

MyObj := Object clone do(
    newSlot("deg")
    with := method(rad, self clone setDeg(rad * 180 / Number constants pi))
)

my := MyObj with(0.5)
my deg
# 28.6478897565411614

Hello world Unit Test

StringTest := UnitTest clone do(
    testInterpolate := method(
        count := 3
        item := "ball"
        assertEquals( "#{count} #{item}s" interpolate, "3 balls" )
    )

    if(isLaunchScript,
        verbose := getSlot("writeln")
        run
    )
)

FileCollector run

References

Scripting Languages: Tcl, Lua, JavaScript, Io

Sample Code