I need help accessing a button inside a div

This question already has an answer here:

How can I select an element with multiple classes in jQuery? 10 answers

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Try this:

   for (var i = 0, cell; cell = table.cells[i]; i++) {                            
            $(cell).find('.btn.btn-default').val("new value");                  
        }

Remove space in find method

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   for(var i = 0, cell; cell = table.cells[i]; i++) {                            
        $(cell).find('.btn .btn-default').val("new value");                  
    }

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