JavaScript Statements

JavaScript statements are made of: Values, Operators, Keywords, Expressions, and Comments. JavaScript statements are executed in the same order as they are written, line by line.

Examples of JavaScript Statements

Semicolons

• Semicolons separate JavaScript statements.
• A semicolon marks the end of a statement in JavaScript. 

Example: In this example, we have shown the use of Semicolons.

Javascript

let a, b, c;
a = 2;
b = 3;
c = a + b;
console.log("The value of c is " + c + ".");

Output

The value of c is 5.

Multiple statements on one line are allowed if they are separated with a semicolon.

a = 2; b = 3; z = a + b;

Code Blocks

JavaScript statements can be grouped together inside curly brackets. Such groups are known as code blocks. The purpose of grouping is to define statements to be executed together. 

Example: In this example, we have shown Code Blocks. 

Javascript

function myFunction() {
    console.log("Hello");
    console.log("How are you?");
}

myFunction()

Output

Hello
How are you?

White Space

JavaScript ignores multiple white spaces.

Example: In this example, we have shown that JavaScript ignores white spaces.

Javascript

console.log(10*2);
console.log(10  *  2);

Output

20
20

Both the result will be the same.

Line Length and Line Breaks

JavaScript code’s preferred line length by most programmers is up to 80 characters. The best place to break a code line in JavaScript, if it doesn’t fit, is after an operator. 

Example: In this example, we have shown Line Length and Line Breaks

document.getElementById("geek1").innerHTML = "Hello Geek!";

Keywords

Keywords are reserved words and cannot be used as a variable name. A JavaScript keyword tells about what kind of operation it will perform. 

Some commonly used keywords are:

Keyword	Description
var	Used to declare a variable
let	Used to declare a block variable
const	Used to declare a block constant
if	Used to decide if certain bloc will get executed or not
switch	Executes a block of codes depending on different cases
for	Executes a block of statements till the condition is true
function	Used to declare a function
return	Used to exit a function
try	Used to handle errors in a block of statements
break	Used to terminate a loop
continue	Used to continue a loop