(Ruby) Check if Integer Exists at JSON Path

Demonstrates how to get an integer value at a JSON path, and how to check to see if it exists.

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()

# First build simple JSON..
json.UpdateInt("test.abc",100)

json.put_EmitCompact(false)
print json.emit() + "\n";

# This is our JSON:
# {
#   "test": {
#     "abc": 100,
#   }
# }

path = "test.notHere"

# The call to IntOf will return 0, because it's not present.
# But how do we know if it really was present, and the value was truly 0?
val = json.IntOf(path)
print "val = " + val.to_s() + "\n";

# We cannot use LastMethodSuccess because LastMethodSuccess only applies
# to methods that:
# - return a string
# - return a new Chilkat object, binary bytes, or a date/time.
# - returns a boolean status where true = success and false = failed.
# - returns an integer where failure is defined by a return value less than zero.
# The IntOf method fits none of these requirements, and therefore the LastMethodSuccess 
# is not a valid indicator..
wasFound = json.get_LastMethodSuccess()
print "wasFound = " + wasFound.to_s() + " (not a valid indicator)" + "\n";

# Instead, if the returned value is 0, we can double-check to see if the member was truly there..
if (val == 0)
    wasFound = json.HasMember(path)
    print "wasFound = " + wasFound.to_s() + "\n";
    if (wasFound == true)
        print "The value was present and is 0." + "\n";
    else
        print "no member is present at test.notHere" + "\n";
    end

else
    print "val = " + val.to_s() + "\n";
end

# Alternatively, you could check to see if the member exists beforehand..
if (json.HasMember(path) == true)
    print "val = " + json.IntOf(path).to_s() + "\n";
else
    print "no member at " + path + "\n";
end