How to style one array element, different from the rest, in leafelt?

I'm trying to only style one element in an array but I'm uncertain how to write the if statement. I'd like to achieve dates[0] returns a weight of 3 while the remaining elements in the array return a weight of 1. Is this possible?

Function:

var dates=[]
function mostRecent(time) {
    dates.push(time)
    if (dates[0]){
        weight = 3
    } else {
        weight = 1
    }
return weight
}

Style:

 pointToLayer: function(feature, latlng){  // changes default icons to circles and styles accordingly
            return new L.CircleMarker(latlng, {
                radius: circleSize(feature.properties.mag),
                fillColor: getColor(feature.properties.mag),
                color: "#000",
                weight: mostRecent(feature.properties.time),
                opacity: 1,
                fillOpacity: 0.5,
            });