Math.max Function in Javascript

Question

I have this simple issue that I can't figure out trying to find out the max from a string, yes it is a string, converting to a float. According to JS it can take an array... but everytime I try to find the max it is just printing the first value. In this case 13... not sure why? The expected result is 30.

Please help. Thanks!

function myFunction() {
    var str = "13, 24, 30, 4";//30
    var res = str.split(",");

    var max =    Math.max(parseFloat(res));

    document.getElementById("demo").innerHTML = res+ " " + max;//test

    }

res is an array. parseFloat takes a string. Math.max does not take an array, but multiple arguments. — Bergi
– Bergi, Commented Feb 23, 2015 at 16:23
Take a look at Bergi's answer. Pay special attention to how he's using the "apply" on the Math.max function. — Marvin Smit
– Marvin Smit, Commented Feb 23, 2015 at 16:28
I will try to test this out. I have actually found a solution myself a couple of hours later. It does help to find some expert or experienced opinions. Thanks a bunch! — jeffr
– jeffr, Commented Feb 24, 2015 at 16:39

Bergi · Accepted Answer · 2015-02-23 16:26:55Z

5

res is an array. parseFloat takes a string. Math.max does not take an array, but multiple arguments. Notice that you don't even need parseFloat, as Math.max casts its arguments to numbers anyway. So you have to use apply to get the array into Math.max:

var str = "13, 24, 30, 4";
var max = Math.max.apply(Math, str.split(", "));

document.getElementById("demo").innerHTML = "max("+res+") = "+max;

answered Feb 23, 2015 at 16:26

Bergi

671k162 gold badges1k silver badges1.5k bronze badges

Sign up to request clarification or add additional context in comments.

1 Comment

jeffr Over a year ago

Oh sorry Bergi! Thanks! I didn't know that's how to do it in here such a noob.

Collectives™ on Stack Overflow

Math.max Function in Javascript

1 Answer 1

1 Comment

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

1 Comment

Your Answer

Sign up or log in

Post as a guest

Related