Javascript Statements - Types of Javascript Statements
Javascript Statements - Types of Javascript Statements
- A computer program is a list of "instructions" to be "executed" by a computer.
- In a programming language, these programming instructions are called statements.
- A JavaScript program is a list of programming statements.
In HTML, JavaScript programs are executed by the web browser.
JavaScript Statements
- JavaScript statements are composed of Values, Operators, Expressions, Keywords, and Comments.
- This statement tells the browser to write "Hello Dolly." inside an HTML element with id="demo":
Sample Code
<!DOCTYPE html>
<html>
<body>
<h2>JavaScript Statements</h2>
<p>In HTML,JavaScript statements are executed by the browser.</p>
<p id="demo"></p>
<script>
document.getElementById("demo").innerHTML = "Kaashiv infotech";
</script>
</body>
</html>
Output
Semicolons
- Semicolons separate JavaScript statements.
- Add a semicolon at the end of each executable statement:
let x, y, z;
x = 4;
y = 6;
z = x + y;
JavaScript White Space
- JavaScript ignores multiple spaces. You can add white space to your script to make it more readable.
let company = "Kaashiv";
let name = "Infotech";
JavaScript Code Blocks
- JavaScript statements can be grouped together in code blocks, inside curly brackets {...}.The purpose of code blocks is to define statements to be executed together.One place you will find statements grouped together in blocks, is in JavaScript functions:
function myname() {
document.getElementById("demo1").innerHTML = "welcome to ";
document.getElementById("demo2").innerHTML = "Kaashvi infotech";
}
| Keyword | Description |
|---|---|
| var | Declares a variable |
| let | Declares a block variable |
| const | Declares a block constant |
| if | Marks a block of statements to be executed on a condition |
| switch | Marks a block of statements to be executed in different cases |
| for | Marks a block of statements to be executed in a loop |
| function | Declares a function |
| return | Exits a function |
| try | Implements error handling to a block of statements |