Get largest value in multi-dimensional array javascript or coffeescript
arrays, coffeescript, javascript, jquery
Solution
You can use `.reduce()`...
array.reduce(function(max, arr) {
return Math.max(max, arr[0]);
}, -Infinity)
Here's a version that doesn't use `Math.max`...
array.reduce(function(max, arr) {
return max >= arr[0] ? max : arr[0];
}, -Infinity);
...and a jsPerf test.
Problem
I have an array that looks like the following: ``` array = [[1, 5], [4, 7], [3, 8], [2, 3], [12, 4], [6, 6], [4, 1], [3, 2], [8, 14]] ``` What I need is the largest number from the first value of the sets, so in this case `12`. Looking at some examples online, the best way I saw to accomplish this is : ``` Math.max.apply Math, array ``` Problem is, this only works with single dimensional arrays. How would I impliment this for my senario? (jquery allowed) The end solution: It wasn't part of the question, but I needed both the min and max from the array, and that changes things a little. ``` unless device.IE justTheDates = magnitudeArray.map (i) -> i[0] @earliest = Math.min.apply Math, justTheDates @latest = Math.max.apply Math, justTheDates else @earliest = magnitudeArray[0][0] @latest = magnitudeArray[0][0] for magnitudeItem in magnitudeArray @earliest = magnitudeItem[0] if magnitudeItem[0] < @earliest @latest = magnitudeItem[0] if magnitudeItem[0] > @latest ```