How to use 'jquery operator' in JavaScript

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PushMenu._jQueryInterface = function _jQueryInterface(operation) {
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  return this.each(function () {
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    var data = $(this).data(DATA_KEY);
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    var _options = $.extend({}, Default, $(this).data());
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    if (!data) {
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      data = new PushMenu(this, _options);
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      $(this).data(DATA_KEY, data);
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    }
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    if (operation === 'toggle') {
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      data[operation]();
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    }
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  });
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};

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value: function _jQueryInterface(operation) {
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  return this.each(function () {
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    var data = $(this).data(DATA_KEY);
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    if (!data) {
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      data = new PushMenu(this);
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      $(this).data(DATA_KEY, data);
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    }
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    if (operation) {
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      data[operation]();
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    }
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  });
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}