Ruby

JSON: Nested Array

See more JSON Examples

Here we have a JSON object that contains nested arrays. This example demonstrates how to access the contents of the nested arrays.

{
 "numbers" : [ 
    ["even", 2, 4, 6, 8], 
    ["prime", 2, 3, 5, 7, 11, 13] 
  ] }

Ruby

require 'chilkat'

success = false

json = Chilkat::CkJsonObject.new()

# This is the above JSON with whitespace chars removed (SPACE, TAB, CR, and LF chars).
# The presence of whitespace chars for pretty-printing makes no difference to the Load
# method. 
jsonStr = "{ \"numbers\" : [ [\"even\", 2, 4, 6, 8], [\"prime\", 2, 3, 5, 7, 11, 13] ] }"

success = json.Load(jsonStr)
if (success != true)
    print json.lastErrorText() + "\n";
    exit
end

# Get the value of the "numbers" object, which is an array that contains JSON arrays.
# outerArray is a CkJsonArray
outerArray = json.ArrayOf("numbers")
if (json.get_LastMethodSuccess() == false)
    print "numbers array not found." + "\n";
    exit
end

numArrays = outerArray.get_Size()

for i in 0 .. numArrays - 1

    # innerArray is a CkJsonArray
    innerArray = outerArray.ArrayAt(i)

    # The first item in the innerArray is a string
    print innerArray.stringAt(0) + ":" + "\n";

    numInnerItems = innerArray.get_Size()

    for j in 1 .. numInnerItems - 1

        print "  " + innerArray.IntAt(j).to_s() + "\n";

    end

end