Iterators

def1.rb

Methods II

# Square the number
def sqr(x)
    return x*x
end

# See how it works.
(rand(4) + 2).times {
    a = rand(300)
    print a,"^2 = ", sqr(a), "\n"
}
print "\n"

# Don't need a parm.
def boom
    print "Boom!\n"
end
boom
boom

# Default parms
print "\n"
def line(cnt, ender = "+", fill = "-")
    print ender, fill * cnt, ender, "\n"
end
line(8)
line(5,'*')
line(11,'+','=')

# Do they change?
def incr(n)
    n = n + 1
end
a = 5
incr(a)
print a,"\n"

---

Functions (and later methods) are defined with def. Parameters are given, without types of course. Default values may be provided.

Note that when we send an integer, the method does not change the value sent.

Iterators

Methods II