Find largest rectangle in Histigram

largestrectinhistogram.js

//Find the largest rectangle in a histogram. 
var myList = [1,3,4,24,26,3,0,2,2,0,2,2,0,2,2,2,0,2,2,2];

function getLargestRect(arr) {

    var result = arr.reduce(function(obj,item) {
        if (item < 1) {
            obj.runningItems = [];
            return obj;
        }
        obj.runningItems = obj.runningItems || [];
        obj.runningItems.push(item);
        obj.runningItems.forEach(function(el,idx){
            var tmpArray = obj.runningItems.slice(idx);
            var result = Math.min.apply(null, tmpArray) * tmpArray.length ;
            obj.maxArea = result > obj.maxArea ? result : obj.maxArea;
        });
        return obj;
    },{maxArea:0});
    return result.maxArea;
}

var result = getLargestRect(myList);
console.log(result);