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.
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.
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.
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 |
---|---|
Used to declare a variable | |
Used to declare a block variable | |
Used to declare a block constant | |
Used to decide if certain block will get executed or not | |
Executes a block of codes depending on different cases | |
Executes a block of statements till the condition is true | |
Used to declare a function | |
Used to exit a function | |
Used to handle errors in a block of statements | |
Used to terminate a loop | |
Used to continue a loop |
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.