Can anyone help me with a simple method [duplicate]

I want to create a method that allows me to display and hide a list of contactsenter image description here whenever I click on the discussion bar that I've maid. I want a pure simple javascript solution please and thank you.

Here's the function's code that is called toggle()

        let toggleBar = true;
        
        let toggle = function() {

                
            
                    if(toggleBar==true){
                        document.getElementById("liste").style.visibility="visible";
                        document.getElementById("liste").style.height="400px";
                        toggleBar==false;
                    }
                    else if(toggleBar=false){
                        document.getElementById("liste").style.visibility="hidden";
                        document.getElementById("liste").style.height="0px";
                        toggleBar==true;
                    }
                
                
        }