How do I find the "max" string in Javascript?

Question

Similar to How to sort strings in JavaScript but I want to avoid sorting first, I just want the "largest" value of a string. For example

f(['Aa', 'B', 'C', 'Acd', 'Ace']) == 'C'

I am thinking it's something with .reduce like

const f = (a) => a.reduce(someFunctionGoesHere)

Where some function has an undefined check

UPDATE: Got it working but looks fugly. I wonder if I can reduce that function

const someFunctionGoesHere = (prev, current) => {
 if (!prev) {
 return current;
 }
 else if (prev.localeCompare(current) < 0) {
 return current;
 } else {
 return prev;
 }
};
const f = (a) => a.reduce(someFunctionGoesHere)
console.log(f(['Aa', 'B', 'C', 'Acd', 'Ace','CC']));

UPDATE: this works, one line, but looks quite ugly. I guess this is the best that can be done with Javascript itself.

const maxString = (a) => a.reduce((prev, current) => (!prev || prev.localeCompare(current) < 0) ? current : prev)
console.log(maxString(['Aa', 'B', 'C', 'Acd', 'Ace','CC']));

• Hassan Imam: You already have reduce function. What do you want to achieve?
• Hassan Imam: You can give a default value in array#reduce.

Answer 1

Indeed, reduce() will get you there:

const f = (array) => array.reduce((a, v) => v.localeCompare(a) > 0 ? v : a, '');
console.log(f(['Aa', 'B', 'C', 'Acd', 'Ace','CC']));

• Ricky Mo: localeCompare returns a number. Your condition only false when v and a are equal.
• Robby Cornelissen: @RickyMo Thanks, updated. Looks like I need more coffee :)
• Archimedes Trajano: @RobbyCornelissen same here. I thought and proven again that sometimes articulating what you want makes the answer come out more naturally.