check_undefined.js

function helloWord(arg1, collectionUID){
    console.log(collectionUID); // undefined
    collectionUID = "222"
    console.log(collectionUID); // 222
    
    try {
        console.log(arg1)
        console.log(collectionUID)
        throw new Error("oh no")
    } catch (error) {
        console.log(error)
        throw error
    }
}

function f1(){
    let collectionUID = undefined
    try {
        console.log("go in")
        console.log(collectionUID);
        helloWord('arg1', collectionUID)
        
    } catch (error) {
        console.log(collectionUID) // <-- still undeinfed
    }
}

f1()