remove is not a function

var selectedItems = []; 
function selectItem(id) { 
    selectedItems.push(id); 
    console.log(selectedItems); 
} 
function unselectItem(id) { 
    selectedItems.remove(id); 
    console.log(selectedItems); 
}

<div onclick="selectItem(1);">select item 1</div> 
<div onclick="selectItem(2);">select item 2</div> 
<div onclick="selectItem(3);">select item 3</div> 
 
<div onclick="unselectItem(1);">unselect item 1</div> 
<div onclick="unselectItem(2);">unselect item 2</div> 
<div onclick="unselectItem(3);">unselect item 3</div>