Alexander Pushkarev

class Marks {
    constructor() { /* ... */}
    createMark() { /* ... */}
    setMark() { /* ... */}
    addMark() { /* ... */}
    removeMark() { /* ... */}
}

var data = [{ id: 1 }, { id: 2 }, { id: 3 }, { id: 4, children: [{ id: 6 }, { id: 7, children: [{ id: 8 }, { id: 9 }] }] }, { id: 5 }];

function findById(data, id) {
    function iter(a) {
        if (a.id === id) {
            result = a;
            return true;
        }
        return Array.isArray(a.children) && a.children.some(iter);
    }

    var result;
    data.some(iter);
    return result
}

console.log(findById(data, 8));

$('.col').height(heightOfTabContent + 'px');  
// или
$('.col').css('height', heightOfTabContent);

$.getJSON('data_actm.json', (result) => {
    let dp   = [],
        labp = [];

    $.each(result, (key, value) => {
        labp.push(value[0]);
        dp.push(value[1]);
    });
});

$('#site').find('.obj').each(async function() {
        let myVar = $(this).text();

        await foo(myVar);
    });

class Popup{
    constructor(options) {
        this.modal      = $(options.modal);
        this.overlay    = $(options.overlay);

        this.overlay.on('click', this.close.bind(this));
    }

    open(content){
        this.modal.html(content);
        this.modal.addClass('open');
        this.overlay.addClass('open');
    }
    close(){
        this.modal.removeClass('open');
        this.overlay.removeClass('');
    }
}

function is_touch_device() {
  return 'ontouchstart' in window        // works on most browsers 
      || navigator.maxTouchPoints;       // works on IE10/11 and Surface
};