Check all Checkboxes in Page via Developer Tools

I have a loop that creates 20 check-boxes in the same page (it creates different forms). I want via chrome developer tools to run a JavaScript without the use of any library that CHECK all check-boxes at the same time.

This is as far as I got:

function() {
    var aa= document.getElementsByTagName("input");
    for (var i =0; i < aa.length; i++){
     aa.elements[i].checked = checked;
    }
}

PS: I have searched and found a lot of Questions in Stack-Overflow but none worked for me, I'll be glad if someone could find me the correct answer.

Solution 1:

(function() {
    var aa= document.getElementsByTagName("input");
    for (var i =0; i < aa.length; i++){
        if (aa[i].type == 'checkbox')
            aa[i].checked = true;
    }
})()

With up to date browsers can use document.querySelectorAll

(function() {
    var aa = document.querySelectorAll("input[type=checkbox]");
    for (var i = 0; i < aa.length; i++){
        aa[i].checked = true;
    }
})()

Solution 2:

From Console Dev Tools (F12) you can use query selector as you use in javascript or jQuery code.

'$$' - means select all items. If you use '$' instead you will get only first item.

So in order to select all checkboxes you can do following

$$('input').map(i => i.checked = true)

or

$$('input[type="checkbox"').map(i => i.checked = true)