JavaScript Statements
Subject: JavaScript
In JavaScript, a statement is a complete instruction that tells the browser to perform a task. These tasks can include declaring variables, making decisions, looping through data, or calling functions.
What is a JavaScript Statement?
A JavaScript statement performs an action, such as:
- Declaring a variable
- Displaying output
- Executing logic
- Repeating tasks
Syntax Rule
- Most statements end with a semicolon
; - JavaScript allows omitting semicolons, but using them is a good practice for clarity and avoiding bugs
Example 1: Simple Statements
Example 2: Function and Loop Statements
Common Types of JavaScript Statements
- Declaration statements:
let x = 10; - Conditional statements:
if,else,switch - Looping statements:
for,while,do...while - Expression statements:
x + y; - Function statements:
function greet() {} - Return statement:
return x;
Statement vs Expression
| Concept | Description | Example |
|---|---|---|
| Statement | Performs an action | if (x > 0) { ... } |
| Expression | Produces a value | x + 5, "Hi" + name |
Key Takeaways
- JavaScript programs are built from statements that perform tasks.
- Statements should end with semicolons to avoid ambiguity.
- Statements define the structure and flow of your code.
- Learn to differentiate between statements and expressions.
- Use statements to implement logic, control structures, and functional behavior.