Hello and welcome to another tutorial!
I know all you guys need to make games, amazing websites... and more.
recommended for @Bookie0
So let's start!
1. Hello World!
A hello world example can be writed with 3 examples:
- In the console
- In the document
- In the alert
It is very simple... you only should write:
And then you just click inspect in the document and hit console and you should see:
In the first one, we printed hello world in the console...
Now, we will print it in the document!
And then you should see in your document "Hello World!" in the left top of your document.
And then you should see an alert comes says "Hello World!"
you must write:
and then you can write:
3. If statements
If statements in js are so helpful!
you can write:
and then it will come an alert says "Hello Zuhdi" because
name is equal to
I don't need to late on comments...
you only should write:
Functions are soooooo cooool in js!
you can write:
then you shoudl CALL the function:
and the output will be
because in the add function we put in these
() a num1 and num2... and when we call it, we wrote in the
() our numbers
6. Simple Calculator with prompts and alerts.
From what we learned today: we need to make a simple calc!
try this code and see the output!
Even though alert is a global method of window, it is always a good practice to put window in front of alert like this: window.alert('hello world'). The same rule should apply to other built-in methods like prompt, confirm, and more (btw method just means function inside of an object for those who don't know). Also, you forgot to add multi-line comments. Multi-line comments are VERY useful for those who need comments that span multiple lines. This is a better option versus having to put the // on every line of what you are going to say. A multi-line starts like this: / and ends like this /. There are a ton of other languages that support this very commenting syntax. Examples include C++, C, PHP, CSS, and lots more!
Hi, Thanks for this quick tutorial but the addition is not working. System is treating variables as string and concatenating them instead of adding them as numbers, i tried using functions but it isn't working.
I'll look for a solution :)
@Razia86 This is because the user input for num1 and num2 is being saved as a string no matter what you type. There are two types of ways to ask for input through prompt that i know of.
1st way ↓
prompt("") // gets saved as a string
2nd way ↓
promptNum("") // gets saved as an integer.
!Solution! - Just put "Num" in front of the "prompt" word.