Io Tutorial

io-example.io

# Io Tutorial

# Math
1+1 # ==> 2
2 sin # ==> 0.909297
2 sqrt # ==> 1.414214
# Variables
a := 1 # ==> 1
a # ==> 1
b := 2 * 3 # ==> 6
a + b # ==> 7
# Conditions
a := 2
if(a == 1) then(writeln("a is one")) else(writeln("a is not one"))
a is not one
if(a == 1, writeln("a is one"), writeln("a is not one"))
a is not one
# Lists
d := List clone append(30, 10, 5, 20)     # ==> list(30, 10, 5, 20)   
d size # ==> 4
d print # ==> list(30, 10, 5, 20)
d := d sort # ==> list(5, 10, 20, 30)
d first # ==> 5
d last # ==> 30
d at(2) # ==> 20
d remove(30) # ==> list(5, 10, 20)
d atPut(1, 123) # ==> list(5, 123, 20)
list(30, 10, 5, 20) select(>10) # ==> list(30, 20)
list(30, 10, 5, 20) detect(>10) # ==> 30
list(30, 10, 5, 20) map(*2) # ==> list(60, 20, 10, 40)
list(30, 10, 5, 20) map(v, v*2) # ==> list(60, 20, 10, 40)
# Loops
for(i, 1, 10, write(i, " "))
1 2 3 4 5 6 7 8 9 10 
d foreach(i, v, writeln(i, ": ", v))
0: 5
1: 123
3: 20
list("abc", "def", "ghi") foreach(println)
abc
def
ghi
# Strings
a := "foo" # ==> "foo"
b := "bar" # ==> "bar"
c := a .. b # ==> "foobar"
c at(0) # ==> 102
c at(0) asCharacter # ==> "f"
s := "this is a test" # ==> "this is a test"
words := s split(" ", "\t") print
"this", "is", "a", "test"
s findSeq("is") # ==> 2
s findSeq("test") # ==> 10
s slice(10) # ==> "test"
s slice(2, 10) # ==> "is is a "