JavaScript

(function (window, document) {
  // we refer to window and document normally
})(window, document);

(function(window){
    var undefined='a';
    console.log(undefined); // prints 'a'
    console.log(window); // prints 'undefined' -> window is defined as 'undefined'
    console.log(a); // throws error (a is undefined).
})(undefined)

(function(undefined){
   console.log(undefined); // prints 'a'
   console.log(a); // throws error (a is undefined).
})('a')

<br />
for(i = 0; i <= 30; i += 3)

var result = $(" ... ").length > 0;
alert(typeof result);
alert(result);

var result = ($(e.target).parents('.jqx-tree').length > 0);
alert(typeof result);
alert(result);
return result;

return !!($(e.target).parents('.jqx-tree').length > 0);

function disableBrowserContextMenu() {
    $(document).on('contextmenu', function (e) {
        if ($(e.target).parents('.jqx-tree').length > 0) {
            e.preventDefault()
        }
    });
}

Richard Deeming wrote:

In jQuery event handlers,

if ($(e.target).parents('.jqx-tree').length > 0)

Richard Deeming wrote:

But e.target will be a single DOM element, so $(e.target) will be a jQuery wrapper containing a single element.