Using checkboxes in pipeline build

Hi all, I would like to use a checkbox parameter in one of my builds, I know how to add it in the Jenkins UI but, how do I get it’s value from within the script ?

I believe parameters get set as either param keys (${param.PARAM_NAME}) or env variables

Thanks env worked ${x} didn’t

def HostName = java.net.InetAddress.getLocalHost().getHostName();
boolean Checked = env.BuildDockerImage;
pipeline
{
    agent {label nodeLable} 
        stages
		{
			stage('Building')
			{
				steps
				{
					script
					{
						if(Checked) 
							echo "Checkbox is Checked"
						else
							echo "Checkbox is unchecked"
					}
				}
			}
		}
 }
 
This always prints "Checkbox is Checked"

Found it myself

env.BuildDockerImage.toBoolean()
or
params.BuildDockerImage