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copied!<p>There is a functional programming concept that can handle this well</p> <p>Basically, your function actually has three arguments, the <code>zoom</code> variable, the <code>coord</code> object, and the <code>tileNames[i]</code> value, but you want the <code>tileNames[i]</code> value to be fixed to a particular value at one time in your code, and leave the other two variables as actually variable.</p> <pre><code>function getTileUrlBuilder(tilename) { return function(coord, zoom) { return "/maps/tiles/tile" + tilename + "/" + zoom + "_" + coord.x + "_" + coord.y; }; } </code></pre> <p>Then you can use this function in your loop. However, since this is actually a common operation, you can use the <code>bind</code> method to handle this:</p> <pre><code>(function(tilename, coord, zoom) { return "/maps/tiles/tile" + tilename + "/" + zoom + "_" + coord.x + "_" + coord.y }).bind(this, tileNames[i]); </code></pre> <p>That will "bind" the implicit <code>this</code> to the current <code>this</code>, and then bind the first argument to the current value of <code>tileNames[i]</code>.</p> <p>EDIT: This, I think, should be the working code.</p> <pre><code>var tileNames = ["beloit", "parking", "access_p"]; var mapType = {}; function getTileUrlFull(tileName, coord, zoom) { return "/maps2/tiles/tiles" + tileName + "/" + zoom + "_" + coord.x + "_" + coord.y + ".png" } for(var i = 0; i < tileNames.length; i++) { mapType[tileNames[i]] = new google.maps.ImageMapType({ getTileUrl: getTileUrlFull.bind(this, tileNames[i]), tileSize: new google.maps.Size(256, 256) }); } </code></pre>

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