CoderByte Challenge: 3rd Largest Word

thirdlargest.js

function ThirdLargest(sArray){
    var oArray = {};
    
    for(i = 0; i <= sArray.length-1; i++){
        oArray[sArray[i]] = sArray[i].length;
    }
    var sortable = [];
    for(x in oArray){
        sortable.push([x, oArray[x]]);
    }
    sortable.sort( function(a,b){
        return b[1] - a[1];
    });
    
    return sortable[2][0];
}