(Ruby) JSON: Miscellaneous Operations

Demonstrates a variety of JSON API methods. This example uses the following JSON document:

{
   "alphabet": "abcdefghijklmnopqrstuvwxyz",
   "sampleData" : {
           "pi": 3.14,
	   "apple": "juicy",
	   "hungry": true,
	   "withoutValue": null,
           "answer": 42
          
	}
}

Chilkat Ruby Downloads install from rubygems.org gem install chilkat or download... Ruby Library for Windows, MacOS, Linux, Alpine Linux

require 'chilkat'

json = Chilkat::CkJsonObject.new()
json.put_EmitCompact(false)

# Assume the file contains the data as shown above..
success = json.LoadFile("qa_data/json/sample2.json")
if (success != true)
    print json.lastErrorText() + "\n";
    exit
end

# First navigate to the "sampleData" object:
# sampleData is a CkJsonObject
sampleData = json.ObjectOf("sampleData")

# Demonstrate BoolAt and BoolOf
print "hungry: " + sampleData.BoolOf("hungry").to_s() + "\n";
print "hungry: " + sampleData.BoolAt(2).to_s() + "\n";

# StringOf returns the value as a string regardless of it's actual type:
print "pi: " + sampleData.stringOf("pi") + "\n";
print "answer: " + sampleData.stringOf("answer") + "\n";
print "withoutValue: " + sampleData.stringOf("withoutValue") + "\n";
print "hungry: " + sampleData.stringOf("hungry") + "\n";

# Demonstrate IsNullOf / IsNullAt
print "withoutValue is null? " + sampleData.IsNullOf("withoutValue").to_s() + "\n";
print "withoutValue is null? " + sampleData.IsNullAt(3).to_s() + "\n";
print "apple is null? " + sampleData.IsNullOf("apple").to_s() + "\n";
print "apple is null? " + sampleData.IsNullAt(1).to_s() + "\n";

# IntOf
print "answer: " + sampleData.IntOf("answer").to_s() + "\n";

# SetNullAt, SetNullOf
# Set "pi" to null
success = sampleData.SetNullAt(0)
# Set "answer" to null
success = sampleData.SetNullOf("answer")

# Show the changes:
print json.emit() + "\n";

# Restore pi and apple:
success = sampleData.SetNumberAt(0,"3.14")
success = sampleData.SetNumberOf("answer","42")

# Show the changes:
print json.emit() + "\n";

# Add a null value named "afterApple" just after "apple"
success = sampleData.AddNullAt(2,"afterApple")

# Add a boolean value just after "pi"
success = sampleData.AddBoolAt(1,"afterPi",false)

# Examine the changes..
print json.emit() + "\n";