Course Content
Introduction to JavaScript
Introduction to JavaScript
Syntax
JavaScript follows a default syntax with parentheses, curly brackets, and semicolons.
Let's create a simple program and delve into its syntax. In JavaScript, you don't need to define a main function as required in languages like C, C++, Java, GoLang, etc. You can directly write your code:
console.log("Hello, user!");
In the example above, we've crafted a program that uses the console.log()
method to print Hello, user!
to the console.
Now, let's break down the syntax:
- To begin, we employ the
console.log()
method. This method serves the purpose of printing values in the console; - Following that, we place
"Hello, user!"
within this method, enclosed in parentheses()
; - The quotes (
"
or'
) serve as indicators to JavaScript, signifying thatHello, user!
is plain text and not a function or any other program-related keyword; - Lastly, the semicolon (
;
) functions as the command terminator, marking the conclusion of a command.
A program comprises a series of commands. If you intend to print text multiple times, you can utilize the semicolon ;
to signal the end of each command:
console.log("Command 1"); console.log("Command 2"); console.log("Command 3");
In the example above, the semicolon ;
serves as the separator for the three commands in our code:
- The first command is
console.log("Command 1")
followed by;
(indicating the end of this command); - Subsequent commands are structured similarly.
Everything was clear?