在对象属性中找到最大的数字

Question

I have a simple JS object literal, which gains a property. I cannot figure out the math, or method of looking at the properties, selecting the highest value from the properties, and then displaying only that key.

var president = {"FDR":1,"Lincoln":2,"Buchanan":43,"Hoover":34};
    president.Obama = 3;
var x;
var txt = "";
for (x in president) {
  txt += president[x] + " ";
}
console.log(president);

I have seen several ways of trying to get max number, in this case 43 but returning "Buchanan", but none of them work within the console I am using. _.max gives me "_ is not defined." I tried a function call within the Math.max.apply method, and it gives me my initial list as the answer, but doesn't put the 5th president in that list.

If anyone can give me some old school hard coding to take in the object properties, including the new property I added, while using the for in loop, I would greatly appreciate it. I can't find a good idea of how this is done.

Answer 1

Try the following:

 var president = {"FDR":1,"Lincoln":2,"Buchanan":43,"Hoover":34}; president.Obama = 3; max = -1; //initial value; pres = ""; //initial president for (x in president) { if(president[x] > max){ //if the value is greater than max pres = x; //set the new president max = president[x]; //set the new max } } console.log(pres);