JS30 Challenge Day10 - Hold shift to select checkboxes (buggy code)

Github Link

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const checkboxes=document.querySelectorAll(‘input [type=checkbox]’);

let lastChecked;

function checkIt(e){

let flag=false;

if(e.shiftKey && this.checked){

checkboxes.forEach(checkbox=>{

if(this===checkbox || checkbox===lastChecked){

flag=!flag;

}

if(flag)

checkbox.checked=true;

});

}

lastChecked=this;

}

checkboxes.forEach(checkbox=>checkbox.addEventListener(‘click’,checkIt));

BUG:

The logic in this code is not complete though.

For example:

-a

-b

-c

-d

-e

If you check a to c.

then you uncheck b.

Then you press shift and check b, 

all the checkboxes below c get checked.