What does console undefined mean?

What does console undefined mean?

> var x = 1; undefined; A variable declaration does not produce a value so again undefined is printed to the console. As a counter-example, expressions containing mathematical operators do produce a value which is printed to the console instead of undefined : > 2 + 2; 4.

How do I use console in Internet Explorer 11?

How to use IE 11 F12 Developer Tools to capture browser console log and network log for OMNIbus WebGUI

1. Launch IE.
2. Once you are ready to re-create the problem, click Tools -> F12 Developer Tools to turn on Developer Tools.
3. Developer Tools window appears.
4. Right-click in Console tab.

What is JavaScript console?

The JavaScript console is a command line interface in your browser that can execute snippets of code. When that code snippet is designed to interact with the webpage you are currently on, result can happen that might not have been possible otherwise.

Is undefined == null?

Null: It is the intentional absence of the value. It is one of the primitive values of JavaScript. Undefined: It means the value does not exist in the compiler. It is the global object.

How do I open the console in IE11?

You can do this with the keyboard using the F12 key or by selecting “F12 Developer Tools” in the “Tools” menu. The Developer Tools will now be open inside the browser tab, and the DOM Explorer tab will be active. Change to the Console tab by clicking its name.

How to deal with undefined console in JavaScript?

Paste the following at the top of your JavaScript (before using the console): The function closure wrapper is to scope the variables as to not define any variables. This guards against both undefined console and undefined console.debug (and other missing methods).

Why do I get console error in JavaScript?

Chances are you are using Internet Explorer, which is causing the problem. Console is an object just like any other in JavaScript. That’s why it has methods like .log and .error on it. In Internet Explorer, the console object is not created until you open up F12 Developer Tools.

Is there a console object in Internet Explorer?

In Internet Explorer, the console object is not created until you open up F12 Developer Tools. As with any object assumed to exist in the runtime, you can catch for this problem with a simple null check. I’m checking for generic console, since window.console only exists in the browser.

What is the console object in JavaScript called?

Console is an object just like any other in JavaScript. That’s why it has methods like .log and .error on it. In Internet Explorer, the console object is not created until you open up F12 Developer Tools. As with any object assumed to exist in the runtime, you can catch for this problem with a simple null check.