how to cd in a jenkins declarative pipeline code example

Example 1: jenkins declarative pipeline for loop

def map = [
        Bob  : 42,
        Alice: 54,
        Max  : 33
]

pipeline {
    agent any

    stages {
        stage('Initialize') {
            steps {
                script {
                    map.each { entry ->
                        stage (entry.key) {
                            timestamps{
                                echo "$entry.value"
                            }
                        }
                    }
                }
            }
        }
    }
}

Example 2: jenkins declarative pipeline functions

Map modules = [:]
pipeline {
    agent any
    stages {
        stage('test') {
            steps {
                script{
                    modules.first = load "first.groovy"
                    modules.first.test1()
                    modules.first.test2()
                }
            }
        }
    }
}