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copied!<p>I think you should use an object to group manufacturers by country. Like this:</p> <pre><code>var conutries, manufacturers, i, len, country, manufacturerByCountry; countries = ['China', 'China', 'Korea', 'USA', 'USA']; manufacturers = ['Lenovo', 'Asus', 'Samsung', 'Apple', 'Blackberry']; len = countries.length; manufacturerByCountry = {}; // expected result: // array : {'China': ['Lenovo', 'Asus'], 'Korea': ['Samsung'] ... } for(i = 0; i < len; i++) { country = countries[i]; if(!manufacturerByCountry[country]) { manufacturerByCountry[country] = []; } manufacturerByCountry[country].push(manufacturers[i]); } console.log(manufacturerByCountry); </code></pre> <p><a href="http://jsfiddle.net/f0t0n/gdnRy/" rel="nofollow"><strong>DEMO</strong></a></p> <hr> <p>If you still want to get the result you've described in question, then you can go with the solution like this:</p> <pre><code>var conutries, manufacturers, i, len, country, manufacturerByCountry, countryIndex, index; countries = ['China', 'China', 'Korea', 'USA', 'USA']; manufacturers = ['Lenovo', 'Asus', 'Samsung', 'Apple', 'Blackberry']; len = countries.length, manufacturerByCountry = [], countryIndex = {}; // expected result: // array : [[China, [Lenovo, Asus]], [Korea, [Samsung]] ... ] for(i = 0; i < len; i++) { country = countries[i]; if(countryIndex[country] === undefined) { index = manufacturerByCountry.push([country, []]) - 1; countryIndex[country] = index; } else { index = countryIndex[country]; } manufacturerByCountry[index][1].push(manufacturers[i]); } console.log(manufacturerByCountry); </code></pre> <p><a href="http://jsfiddle.net/f0t0n/662JZ/" rel="nofollow"><strong>DEMO</strong></a></p>

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