Sample JavaScript Code

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In this guide, I will look at the overall structure of the Javascript code, commands, and their separation.

Commands

To add to the code of several commands, you can put one after another separating them using the semicolon.

For example:

alert(Hello); alert(World!');

Usually, each command is written on a separate line so the code is easier to read:

alert(Hello); 
alert(World!');

Semicolon

You can omit the semicolon in many cases:

This will work too:

alert(Hello)
alert(World!')

In this case, JavaScript interprets the transition to a new line as a separator and automatically inserts a “virtual” semicolon between them.

However, it is important that “in many cases” does not mean “always!”

For example, run this code:

alert(3 +
1
+ 2);

Outputs 6.

That is, the semicolon is not put. Why? Intuitively, it is an “incomplete expression,” so the Javascript is waiting for the end of it and does not put a semicolon. And here it is, perhaps, a good thing.

However, in some important situations, JavaScript “forgets” to put a semicolon where it is needed. So it is recommended to always put it in your code.

Comments

Over time, the program becomes large and complex. There is a necessity to add comments to explain what is happening and why. Comments can be anywhere in the program and do not affect its implementation. The JavaScript interpreter simply ignores them.

Single-line comments begin with a double slash “//”. The text is a comment to the end of the line:

// command below says "Hello"
alert( 'Hello' );
alert( 'World' ); // Second message is output separately

Multiline comments begin with a slash-asterisk “/ *” and end with an asterisk-slash “* /”, like this:

/* Example with two messages
Here is a multiline comment
*/
alert( 'Hello' );
alert( 'Wrold' );

All the content of the comment is ignored. If you put the code inside “/ * … * /” or after “//” it will not be executed.

Nested comments are not supported!

This code will not work:

/ *
   / * Nested comment?!? * /
* /
alert ( 'World');

Do not be afraid to comment. As for the increase of the code size, it is not bad, because there are JavaScript compression tools which can remove comments.

Thanks for your attention!

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