JavaScript
JavaScript Statements
JavaScript statements are the actions that the JavaScript engine is programmed to do. These are the instructional building blocks of all JavaScript programs.
Computer programs include the instructions that a computer follows. Similarly, JavaScript follows the instructions written in statements. In simple words, the programming language’s instructions are called statements.
JavaScript Statements Components
A JavaScript statement is composed of various components.
- Values
- Keywords
- Operators
- Expressions and
- Comments
To instruct the browser to write “Hello World,” a JavaScript statement can be used.
A JavaScript program can contain more than one or two JavaScript statements. Write statements in the order you want them to be executed in.
Semicolons (;)
Separate one JavaScript statement from another with a semicolon. Regardless of how many JavaScript statements you are writing, separate them all by adding a semicolon at the end of every statement. It is necessary for the program or statement to be executed properly.
JavaScript White Space
Whether you add space between the characters of a JavaScript statement or not, it does not affect the programming or code execution. However, developers often add multiple whitespaces while writing JavaScript statements to improve code readability.
To enhance code clarity, it is recommended to add spaces between JavaScript operators. For example +, –, *, and /.
JavaScript Line Length and Line Breaks
When writing a JavaScript statement, keep the code line shorter than 80 characters. It offers the best program reliability.
For any JavaScript statement longer than 80 characters or that is not a one-liner, it’s best to break it. The best way to break such long JavaScript lines is to break them after an operator.
JavaScript Code Blocks
These blocks are used to group multiple JavaScript statements together. Curly bracket {…} is used for this purpose. The code blocks indicate that the following code should be executed together. Most JavaScript functions contain multiple statements grouped together inside code blocks.
JavaScript Keywords
These keywords are used to define a JavaScript statement. Most JavaScript statements begin with a keyword that enables the browser to identify the action that needs to be performed. Most commonly used JavaScript keywords are:
- var: To declare a variable.
- let: declares a block variable
- const: used to command a block constant.
- if: to mark a JavaScript statement to be executed on a certain condition.
- Switch: allows programmers to execute the same block of JavaScript statements in different cases.
- for: used when executing blocks of statements in a loop.
- function: Declares a function.
- return: To exit a function.
- try: Implement error handling.
