Coding Standards: JavaScript

Naming Conventions:

Variable Name:

Variable names should be in camelCase for identifier names. All names start with a letter.

Example:

firstName = "Anusha";

lastName = "Mehrin";

Global Variable Name:

Global variable names should also be in camelCase.

Example:

var value=100;

Function Name:

Function names are declared with function keyword, followed by a name which should be written in camelCase.

Example:

function myFunction(a, b) { return a * b;
}

Constant Name:

Constant names should be written in camelCase.

Example:

const userAge = 30;

Class Name:

Class Names should be written in PascalCase.

Example:

Class UserStory {…..}

Indentation:

4-space indentation should be used.

Example:

function myFunction(a, b)

{ ....return a * b;
}

Line Length:

Line length should be less than 80. If a statement does not fit on one line, it should be broken after an operator or a comma.

Module Name:

Module names should be written in lower case. Multiple words should be written in camelCase.

Example:

modules/ canvas.js square.js

Exception Name:

Exception Names should be written in PascalCase.

Spaces Around Operators:

Spaces should be put around operators and commas.

Example:

var a = b + c;

Statement Rules for simple statements:

Simple statements should preferrably end with semicolon.

Example:

var values = ["Apple", "Orange", "Mango"];

General rules for complex statements:

1. Opening bracket should be put at the end of the first line.

2. One space should be used before the opening bracket.

3. Closing bracket on a new line should be put without leading spaces.

4. Complex statements should not end with a semicolon.

General rules for object definitions:

1. Opening bracket should be put on the same line as the object name.

2. Colon plus one space should be used between each property and its value.

3. Quotes should be put around string values, not around numeric values.

4. Comma should not be added after the last property-value pair.

5. Closing bracket should be put on a new line without leading spaces.

6. Object definition should always end with a semicolon.

Example:

var course =

{

courseName: "Software Engineering",

courseCode: "CSE327",

credit: 3

};