Really basic javascript function concept [duplicate]

Question

Testing my ability to write code in JavaScript and Node (perhaps a bit of a monumental effort) and also attempting to understand standards.

I want to dynamically change an attribute in an object as in this examnple:

    var parms = {
        host:'',
        port:'',
        user:'',
        pass:''
    };
    
    parms.user='foo';
    parms.pass='bar';
    console.log(parms.user);
    setParm = function(param,value){
        parms.param = value;
    }
    
    setParm('user','baz');
    console.log(parms.user);

However, I'm completely blind. I feel as though I may be in a blind alley in terms of what I think is possible versus what is actually workable.

Answer 1

You are passing the property as a string, so accessing with . won't work. One solution I know is that you can use dict-like indexing:

    var parms = {
        host:'',
        port:'',
        user:'',
        pass:''
    };
    
    parms.user='foo';
    parms.pass='bar';
    console.log(parms.user);
    setParm = function(param,value){
        parms[param] = value;
    }
    
    setParm('user','baz');
    console.log(parms.user);