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It does work fine in those situations and works just fine as the OP requested, for alert. Many answers here do not address using alert as the OP requested. Anyhow, It is, however, formatted for data transport. This version seems to return a very similar result as toSource().
Copying an object is a great option when wanting to maintain the nice tree formatting and all that fancy stuff. But if all you need is some basic information, JSON.stringify() might be a good alternative. Console.log() dynamic evaluationThis whole thing might not be of a concert to you. But the problem is that the nested objects after level 2 are now flattened, and this might be a problem with complex objects. You can also use ES6 template literal concept to display the content of a JavaScript object in a string format. Also, note in javascript functions are considered as objects. Yes this is a good solution, however it only works as exptected if you want to log only the object (e.g. console.dir).
CSS feature detection in JavaScript?!
If you console.log all of the data, you will see that there are many more properties for each user. The first log will print the properties within the user object. The second will identify the object as “user” and print the properties within it. Instead of typing console.log() three times we can include them all.
- The second will identify the object as “user” and print the properties within it.
- Use console.dir to display an interactive list of the properties of the specified JavaScript object.
- But, did you know that there is more to console than just log?
- This version is more like a poly-fil so that you can use it in any environment.
- And to reset this counter, we have to pass the name into countReset.
- That function also works on Google Chrome when using the JavaScript Console (Shift+Control+J or Shift+Control+I, depending on the Chrome version).
Thus, it’s easier to simply use a utility library like Lodash, instead of implementing the entire functionality on your own. When you get into your console window, you’ll see your object logged nicely in a form of an expandable tree. There will also be a little preview of what you can find inside. Above you can see the most basic way to log an object – by using console.log(). Don’t get me wrong – it’s completely fine to do it that way, but it has one fundamental flaw – dynamically evaluation. Now, I don’t want to remind you that everything in JS is an object. We’re interested in properly logging an object, which here is just a “simple” key-value structure.
JavaScript Console.log() Example – How to Print to the Console in JS
The styles get passed into the second argument of the log. And to reset this counter, we have to pass the name into countReset. This way you can have several counters running at the same time and only reset specific ones. If we were to change isItWorking to true, then the message will not be logged. If the first argument is false, then the message will be logged. We can print messages to the console conditionally with console.assert().
How do I display the output console in HTML?
- (function ()
- var old = console. log;
- var logger = document. getElementById('log');
- console. log = function (message)
- if (typeof message == 'object')
- logger. innerHTML += (JSON && JSON. stringify ? JSON.
- else
- logger. innerHTML += message + '<br />';
You will quickly find that using console.log() in JavaScript is straightforward and critical to debugging code. Best of all, almost all desktop web browsers have support for the console, and you can easily open it by pressing F12 on your keyboard. The console.log() function is an incredibly useful part of JavaScript that you can use to debug your code. So, in this example, we will use setTimeout() to emulate code running.
Multiple Values
This behavior will differ depending on your web browser. By doing this we are essentially creating a new copy of the object meaning changes made after the fact won’t affect the value you logged. It is possible to work around this by utilizing the JSON object. Since we want to modify the object’s contents, we will declare it using JavaScript’s let keyword. If you were to run this piece of code, you would end up with the following message printed to the console. To showcase this, let us write a short example where we use “console.log()” and pass in the string “This website is pimylifeup.com“.
What is JSX in React?
JSX stands for JavaScript XML. JSX allows us to write HTML in React. JSX makes it easier to write and add HTML in React.
%f – A floating-point number will be output in the place of this substitution string. Please note for every substitution string you have, you should have a value to be inserted into it. We put this to use in the following JavaScript example of using the console.log() function.