1. Semicolons:
- Semicolons separate JavaScript statements.
- A semicolon marks the end of a statement in JavaScript.
Example:
JavaScript
let a, b, c;a = 4;b = 3;c = a + b;console.log("The value of c is " + c + "."); |
The value of c is 7.
Multiple statements on one line are allowed if they are separated with a semicolon.
a=4;b=3;z=a+b;
2. 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: JavaScript function
JavaScript
function test() { console.log("Hello"); console.log("How are you Smith?");}test() |
Hello How are you Smith?
3. White Space: JavaScript ignores multiple white spaces.
Example:
JavaScript
console.log(10 * 2);console.log(10 * 2); |
Output
20 20
Both the result will be the same
4. 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:
document.getElementById("user").inner HTML =
"Hello World !";
5. 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:
- break and continue: break keyword are used to terminate a loop and continue is used to skip a particular iteration in a loop and move to the next iteration.
- do…. while: In this, the statements written within the do block are executed till the condition in while is true.
- for: It helps in executing a block of statements till the condition is true.
- function: This keyword is used to declare a function.
- return: This keyword is used to exit a function.
- switch: This helps in executing a block of codes depending on different cases.
- var, let, and const: These keywords are used to declare a variable in js.