Finding the max value of a property in an array of objects

To find the maximum y value of the objects in array:

Math.max.apply(Math, array.map(function(o) { return o.y; }))

or in more modern JavaScript:

Math.max(...array.map(o => o.y))

Warning:

This method is not advisable, it is better to use reduce. With a large array, Math.max will be called with a large number of arguments, which can cause stack overflow.