How to create a condition in protractor for when an element exists or not

Question

I\'m using Protractor JS. And the site is written in Angular JS.

So I have a toggle switch. And I noticed the value in the toggle switch goes from true to false and

Answer 1

isDisplayed() did not work for me. The API may have been changed. isPresent() is my solution:

    var logoutButton =  element(by.css('[ng-click="log_out()"]'));
    logoutButton.isPresent().then(function(result) {
    if ( result ) {
        logoutButton.click();
    } else {
        //do nothing
    }
    });