jQuery min/max property from array of elements

Use Fast JavaScript Max/Min - John Resig

Example with three logos of google, yahoo and bing.

HTML

<img src="http://www.google.co.in/intl/en_com/images/srpr/logo1w.png" alt="Google Logo" /><br/>
<img src="http://l.yimg.com/a/i/ww/met/yahoo_logo_in_061509.png" alt="Yahoo Logo" /><br/>
<img src="http://www.bing.com/fd/s/a/h1.png" alt="Bing Logo" />

Javascript

$(document).ready(function(){
    // Function to get the Max value in Array
    Array.max = function( array ){
        return Math.max.apply( Math, array );
    };

    // Function to get the Min value in Array
    Array.min = function( array ){
       return Math.min.apply( Math, array );
    };

    //updated as per Sime Vidas comment.
    var widths= $('img').map(function() {
        return $(this).width();
    }).get();

    alert("Max Width: " + Array.max(widths));
    alert("Min Width: " + Array.min(widths));
});

P.S: jsfiddle here

You can use apply outside the context of OO, no need to extend the prototype:

var maxHeight = Math.max.apply( null,
        $('img').map(function(){ return $(this).height(); }).get() );

I like the elegant solution posted as a .map() example in the jQuery docs on how to equalize div heights. I basically adapted it to work with widths and made a demo.

$.fn.limitWidth = function(max){
  var limit = (max) ? 'max' : 'min';
  return this.width( Math[limit].apply(this, $(this).map(function(i,e){
   return $(e).width();
  }).get() ) );
};

// Use the function above as follows
$('.max-width').limitWidth(true); // true flag means set to max
$('.min-width').limitWidth();     // no flag/false flag means set to min

Take a look at the calculation plugin, maybe it can help you with your problems. They offer a number of math functions, like min, max and avg on DOM-elements.

Examples:

$("input[name^='min']").min();
$("input[name^='max']").max();

Rolled up as a plugin to return min-max of width and height:

// Functions to get the Min & Max value in Array

if (!Array.min) { Array.min = function( array ){return Math.min.apply( Math, array )} }
if (!Array.max) { Array.max = function( array ){return Math.max.apply( Math, array )} }

(function( $ ){     // Standard jQuery closure to hide '$' from other libraries.

    // jQuery plug-in to get the min and max widths of a set of elements

    $.fn.dimensionsMinMax = function(whnx) {

    /*
    ################################################################################

    Name
    ====

        dimensionsMinMax(whnx) - jQuery plug-in to get min & max width & height

    Parameters
    ==========

        whnx - A 4-element array to receive the min and max values of the elements:
            whnx[0] = minimum width;
            whnx[1] = maximum width;
            whnx[2] = minimum height;
            whnx[3] = maximum height.

    Returns
    =======

        this - so it can be "chained".

    Example
    =======

        var minmax = new Array(4);
        var number_of_images = $('img').dimensionsMinMax(minmax).class('abc').length;
        console.log('number of images = ', number_of_images);
        console.log('width  range = ', minmax[0], ' to ', minmax[1]);
        console.log('height range = ', minmax[2], ' to ', minmax[3]);

    ################################################################################  
    */
        var  widths = new Array(this.length);
        var heights = new Array(this.length);

        this.each(function(i){
            $this      = $(this);
             widths[i] = $this.width();
            heights[i] = $this.height(); 
        });

        whnx[0] = Array.min( widths);
        whnx[1] = Array.max( widths);
        whnx[2] = Array.min(heights);
        whnx[3] = Array.max(heights);

        return this;
    }

})( jQuery );   // End of standard jQuery closure.