Get largest value in multi-dimensional array javascript or coffeescript

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.

http://jsfiddle.net/zerkms/HM7es/

var max = Math.max.apply(Math, arr.map(function(i) {
    return i[0];
}));

So at first you use array.map() to convert the 2-dimensional array to a flat one, and after that use Math.max()

A simple solution using Underscore.js' max that avoids generating an intermediate array:

max = _(array).max(_.first)[0]

(JSFiddle)

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