leafletjs : Highlight polyline on mouseover

I have an array of polylines that displayed on a map, now what I am aiming to do is, when I hover over a certain polyline from the list, only that polyline highlights (or changes color).

What I have right now is something like this (this code is inside a loop that goes to the end filling polyLineArray with individual polyline data,

var pointList = [];

// pointList is an array and lat/lngs

var polyLineProperties = {
    color: 'red',
    opacity: 1,
    weight: 5,
    clickable: true
}

var polyLine = new L.polyline(pointList, polyLineProperties);
polyLine.on('mouseover', function() {
    // WHAT TO DO HERE to HIGHLIGHT that specific polyline.
});

polyLineArray.push(polyLine);

How to alter any property of a polyline and not just color?

Okay,

Sorry but I've managed to figure this one out, thanks to the tutorial on the following link,

Interactive Choropleth Map

This is all that was required,

polyLine.on('mouseover', function(e) {
    var layer = e.target;

    layer.setStyle({
        color: 'blue',
        opacity: 1,
        weight: 5
    });
});

Thank you all for reading.