Pass parameter to arr.{function parameter} = property

Question

I would like to pass a parameter from the function into the array.[parameter here] = value But i cannot seem to get this to work, any suggestions to fix this.

below is the code i have so far

    function editStyle(Style,element,value){
    var i = menu.style.findIndex(style => style.Name === Style);
    menu.style[i].[element] = value;}