How do you print something in javascript?
Logging messages to the console is a very basic way to diagnose and troubleshoot minor issues in your code. But,
did you know that there is more to If you've never used the multi-line editor mode in Firefox, you should give it a try right now! Just open the console, This gives you a multi-line code editor right inside Firefox. Let's start with a very basic log example. Type that into the Firefox console and run the code. You can click the "Run" button or press In this example, we should see "1" in the console. Pretty straightforward, right? Did you know that you can include multiple values? Add a string
to the beginning to easily identify what it is you are logging. But what if we have multiple values that we want to log? Instead of typing But that's too much work. Just wrap them with curly braces! Now you get an object with the named values. You can do the same thing with an object. 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. If you are logging many things to the console, this can help you to identify each log. Variables within the logDid you know that you can use portions of your log as variables?
In this example, The The output of this statement would be: "John is 29 years old.". Variations of logsThere are a few
variations of logs. There is the most widely used
These variations add styling to our logs in the console. For instance, the Note: The styles vary from browser to browser. Optional LogsWe can print messages to the console conditionally with
If the first argument is false, then the message will be logged. If we were
to change CountingDid you know that you can count with console?
Each iteration of this loop will print a count to the console. You will see "default: 1, default: 2", and so on until it reaches 10. If you run this same loop again you will see that the count picks up where it left off; 11 - 20. To reset the counter we can use And, if you want to name the counter to something other than "default", you can!
Now that we have added a label, you will see "Counter 1, Counter 2", and so on. And to reset this counter, we have to pass the name into Track TimeBesides counting, you can also time something like a stopwatch. To start a timer we can use
As you would expect, after 5 seconds, we will have a timer end log of 5 seconds. We can also log the current time of our timer while it's running, without stopping it. We do this by using
In this example, we will get our 2 second Just the same as the counter, we can label timers and have multiple running at the same time. GroupsAnother thing that you can do with We start a group by using
This group of logs will be collapsible. This makes it easy to identify sets of logs. By default, the group is not collapsed. You can set it to collapsed by using Labels can also be passed into the Stack TraceYou can also do a stack trace with
In this example, we have very simple functions that just call each other. Then, in the last function, we call TablesHere's one of the most
mind-blowing uses for console: So let's set up some data to log:
Now we'll log this data using But wait – it gets better! If we only want the brands, just How about a more complex example? In this example, we'll use jsonplaceholder.
Here we are just printing the "name" and "email". If you Style ?Did you know that you can use CSS properties to style your logs? To do this, we use
You can use this to make your logs stand out. ClearIf you are trying to troubleshoot an issue using logs, you may be refreshing a lot and your console may get cluttered. Just add Just don't add it to the bottom of your code, lol. Thanks for Reading!If you want to revisit the concepts in this article via video, you can check out this video-version I made here. I'm Jesse from Texas. Check out my other content and let me know how I can help you on your journey to becoming a web developer.
Learn to code for free. freeCodeCamp's open source curriculum has helped more than 40,000 people get jobs as developers. Get started How do you display text in JavaScript?There are four ways to display text in the browser using JavaScript:. Using the document. write() method to write inside the tag.. Using the document. querySelector() method to replace the content of a specific element.. Using the console. ... . Using the alert() method to write text output to the popup box.. How do I print a line of text in JavaScript?printing in a single line in javascript. var s = "";. for(var i = 1; i < 11; i += 1) {. s += i + " ";. console. log(s);. How do you print numbers in JavaScript?“how to print numbers in javascript” Code Answer. for (var i = 1; i <= 100; i++) {. console. log(i);. //the boolean or the second term in the for statement.. //which in this case is i <= 100 makes the console print.. // numbers 1-100.. //KEY: REPLACE !)) WITH THE NUMBER U WANT IT TO GO UNTIL.. How do I print a specific section in JavaScript?How To Print A Page Or Section in Javascript (Simple Examples). var printwin = window. open("");. printwin. document. write(document. getElementById("TARGET"). innerHTML);. printwin. print();. |