JavaScript Best Practice

General Recommendations

• Avoid global variables.
• Define all local var's at the top of each function.
• Use explicit comparators (ie “===”) over coerced comparators (ie “==”).
• Use shortcuts for default value assignment.
• Always put braces on the right of block definitions.
• Always use semi-colons at the end of a line.
• Never leave dangling commas in lists and object definitions.
• Never use “eval()”.
• Never leave debugger statements in code.
• Always follow standard variable and function naming conventions.
• Never use hyphens in variable names.
• Never test variables against text strings for triggered events.
• Never hard code strings within program code or templates.
• Always use double quotes for NLS'd strings.
• Never hard code usernames or passwords in client processed code.
• Never persist passwords locally.

Logging and Comments

• Use standard logging with useful details.
• Use the proper logging levels.
• Use multiple arguments to log, not string concatenation.
• Comment all complex logic.
• Use JSDoc syntax for all public module, function, and variables.

Performance

• Be suspicious of logic inside loops.
• Keep the DOM as small as possible.
• Minimize DOM access / manipulation.
• Ensure all 3rd party libraries are optimized.

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