Crystal type examples

types.cr

# This is an array if Int32
a = [] of Int32
# or we can also do this
a = Array(Int32)
# or even 
a = [1,2,3]

# this is a Hash
a = {} of Symbol => Int32
# or
a = Hash(Symbol, Int32)
# or
a = {:foo => 1, :bar => 2}

# this is an array of mixed types
a = Array(Int32|String)
# add stuff to the array
a << "foo"
a << 1
print a 
# => ["foo", 1]