jQuery: Test if checkbox is NOT checked

Question

I\'m having trouble figuring this out. I have two checkboxes (in the future will have more):

• checkSurfaceEnvironment-1
• checkSurface

Answer 1

if($("#checkbox1").prop('checked') == false){
    alert('checkbox is not checked');
    //do something
}
else
{ 
    alert('checkbox is checked');
}