Posted At: Jul 10, 2024 - 191 Views
Code Structure! 👩💻
To write efficient JavaScript, understanding the basic building blocks of code is crucial. Here are the core concepts:
Statements
Statements are the basic syntax constructs that perform actions in JavaScript.
- Basic Example: The
console.log('Hello, Universe!');statement outputs a message to the console. - Multiple Statements: You can include multiple statements in your code, typically separated by semicolons.
console.log('Hello'); console.log('Universe');
- Readability: For better readability, place each statement on a separate line.
console.log('Hello');
console.log('Universe');
Semicolons
Semicolons are often used to separate statements, but they can sometimes be omitted where a line break exists.
- Automatic Insertion: JavaScript often treats a newline as an implicit semicolon.
console.log('Hello')
console.log('Universe')
- Exceptions: There are cases where JavaScript does not insert a semicolon automatically, leading to errors.
console.log(4 +
2
+ 1);
// Outputs 7
Common Error Example
Skipping semicolons can result in unexpected errors. For instance:
console.log("Hello")
[3, 4].forEach(console.log);
- Without Semicolon: This code will produce an error because JavaScript tries to combine the two lines into a single statement.
- Proper Usage: Always include semicolons to prevent such errors.
console.log("Hello");
[3, 4].forEach(console.log);
Comments
Comments are essential for explaining the purpose and functionality of your code.
- Single-line Comments: Begin with
//and extend to the end of the line.
// Single-line comment
console.log('Hello'); // Comment after a statement
- Multiline Comments: Start with
/*and end with*/.
/* This is a multiline comment
that spans multiple lines */
console.log('Hello');
console.log('Universe');
- Disabling Code: Use comments to temporarily disable parts of your code.
/*
console.log('Hello');
*/
console.log('Universe');
- Hotkeys: In most editors, you can comment a line with
Ctrl+/for single-line comments andCtrl+Shift+/for multiline comments. On Mac, useCmdinstead ofCtrl.
Important Note
JavaScript does not support nested comments./*
/* This nested comment will cause an error */
*/
console.log('Universe');
Best Practices
- Use Comments: They make your code more understandable and maintainable.
- Avoid Nested Comments: They are not supported and will lead to errors.
- Minification: Modern tools can strip out comments when deploying code to production, so they won’t impact performance.
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