how to create a progress bar with slashes in node js

/*
all credits goes to me, AroliS^.
You are not allowed to publish this as yours,
however you can use it as you want.
*/

  function createBar( percent )
    {
        let num = parseInt( percent / 10, 10 )
            , slash = '//////////' //progress bar
            , decreasing = slash.length - num // decreasing means the number of percent that it will increased.
            , addslash = ''; //adding slashes

            for( var i = 0; i < num; i++ )
            {
                addslash += '/'; //we're looping the percent that will be added in slashes
            }

        return addslash == '' ? '['+ slash.slice( 0, decreasing ) + ']' : `[\` ${addslash} \``+ slash.slice( 0, decreasing ) + `]`;
    }