Given an array of values [1,2,0,-5,8,3], how can I get the maximum value in JavaScript?
I know I can write a loop and keep track of the maximum value, but am looking for a more code-efficient way of doing so with the JavaScript syntax.
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1Second result from 'max of array in javascript' on google ^Andrew Li– Andrew Li2017-07-15 23:04:39 +00:00Commented Jul 15, 2017 at 23:04
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Agree, maybe edit the other to include the word armax though... Coming from python, that's what I instictively googled and nothing came up...byteSlayer– byteSlayer2017-07-15 23:16:40 +00:00Commented Jul 15, 2017 at 23:16
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I would say it has a reasonable title. Regardless of language, I would have search 'max of array in <language>', but that's just me.Andrew Li– Andrew Li2017-07-15 23:17:38 +00:00Commented Jul 15, 2017 at 23:17
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2 Answers
You can use Math.max and ES6 spread syntax (...):
let array = [1, 2, 0, -5, 8, 3];
console.log(Math.max(...array)); //=> 8
11 Comments
Khauri
Or without the spread operator
Math.max.apply(false, arr)
ibrahim mahrir
The spread operator is not efficient.
Andrew Li
@ibrahimmahrir There is no spread 'operator', it's syntax.
Andrew Li
@ibrahimmahrir Is it? I tested and against
reduce it sometimes wins and sometimes loses. Plus efficiency shouldn't even matter, we're talking less than 1 millisecond.
Estus Flask
@ibrahimmahrir
Math.max(...arr) will likely be somewhat slower than Math.max.apply(null, arr) but nowhere near as 'not efficient'. Neat JS features are almost always a trade-off. If you have other information that can be proven with numbers, please, consider providing an answer in dupe question. Even though this has been discussed on SO countless times, new good answers are always good. |
You can use the following:
yourArray.reduce((max, value) => {return Math.max(max, value)});
The reduce will itterate over values in the array, at each time returning the maximum of all of the values before the current one.
3 Comments
Andrew Li
Or just
( … ) => … for an implicit return ...Andrew Li
Also, why through the trouble of a reduce operation when spread syntax exists??
Bergi
You might want to provide some reasonable default value that is returned when the array is empty, such a
0, -1 or -Infinity.