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// looping an HTMLCollection using for
var TheadRows = document.getElementById('table').tHead.rows[0].cells

for (var i = 0; i < TheadRows.length; i++) {
    console.log(TheadRows[i].innerText)
}; 

    
    
// looping with Array.prototype.forEach (only for HTMLCollection object)
// using for Each is not suitable for arrays (i.e., indexed lists) as it is supposed to be used with objects (i.e., named parameters)
// however you can use forEach.call to get it to work
[].forEach.call(TheadRows, function(el) {
    console.dir(el)
});



// for in however is designed to be used with objects
for (var property in TbodyRows) {
    debug(TbodyRows[property])
}




// in ES6 can use for...of 
// see https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/for...of
for (el of TheadRows) {
    console.log(el.id);
}


// another example
bullets.forEach((bullet) => {

});

// vs...

for(let bullet of bullets) {

}

// something else

[].forEach.call(document.querySelectorAll('.foo'), (foo) => {
    foo.classList.add('bar');
});

[...document.querySelectorAll('.foo')].forEach((foo) => {
    foo.classList.add('bar');
});

Array.from(document.querySelectorAll('.foo')).forEach((foo) => {
    foo.classList.add('bar');
});

for(let foo of document.querySelectorAll('.foo')) {
    foo.classList.add('bar');
}