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String.prototype.format = function()
{
   var content = this;
   for (var i=0; i < arguments.length; i++)
   {
        var replacement = '{' + i + '}';
        content = content.replace(replacement, arguments[i]);  
   }
   return content;
};

/* use exemple */
a = 'someValue is {0} and anotherValue is {1}'.format('someValue', 'anotherValue'); // Hello world.
$("p.format").text(a);