![Use shortcut declarations - Use {} instead of new Object() - Use "" instead of new String() - Use 0 instead of new Number() - Use false instead of new Boolean() - Use [] instead of new Array() - Use /()/ instead of new RegExp() - Use function (){} instead of new function()](https://image.slidesharecdn.com/jsguide-150310083748-conversion-gate01/75/JavaScript-Coding-Guidelines-11-2048.jpg)
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JavaScript Coding Guidelines
The document outlines best practices for JavaScript coding, emphasizing the use of strict equality (===), avoiding global variables, and initializing variables upon declaration. It also advises against using 'eval', declaring variables inside loops, and suggests using JSON for data transfer instead of XML. Additionally, it highlights the importance of adhering to team coding conventions and includes references for further reading.
JavaScript Coding Guidelines
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- 4. Use === Insteadof == "If two operands are of the same type and value, then === produces true and !== produces false.“ - JavaScript: The Good Parts
- 5. Eval = Bad Notonly will this decrease your script's performance substantially, but it also poses a huge security risk.
- 6. Don't Use Short-Hand Thisis a terrible practice that should be avoided at all costs.
- 8. Declarations on Top Itis a good coding practice to put all declarations at the top of each script or function.
- 9. Initialize Variables It isa good coding practice to initialize variables when you declare them.
- 11. Use shortcut declarations -Use {} instead of new Object() - Use "" instead of new String() - Use 0 instead of new Number() - Use false instead of new Boolean() - Use [] instead of new Array() - Use /()/ instead of new RegExp() - Use function (){} instead of new function()
- 12. Avoid Global Variables Minimizethe use of global variables. This includes all data types, objects, and functions. Global variables and functions can be overwritten by other scripts. Use local variables instead, and learn how to use closures.
- 14. Always Declare LocalVariables All variables used in a function should be declared as local variables. Local variables must be declared with the “var” keyword, otherwise they will become global variables.
- 15. Long List ofVariables? Omit the "Var" Keyword and Use Commas Instead
- 17. Say “No!” toloops declarations Do not declare variables inside loops, don't make the engine work any harder than it must.
- 19. End Your Switcheswith Defaults Always end your switch statements with a default. Even if you think there is no need for it.
- 20. Avoid Cluttering TheGlobal Namespace Using globals may cause naming conflicts between javascript source files and cause code to break. For this reason, it is a good practice to encapsulate functionality within a single global namespace.
- 21. Avoid sync "Ajax"calls If you think that your situation requires sync mode, it is most likely time to re-think your design. Very few (if any) situations actually require Ajax requests in sync mode.
- 22. Use JSON When storingdata structures as plain text or sending/retrieving data structures via Ajax, use JSON instead of XML when possible.
- 23. Comment Your Code Alwayscomment important sections of your code.
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- 26. Object Objects can becreated using a constructor or an object literal. The constructor should be a custom function only.
- 28. Constructor Constructor functions simplyassign values to slots of a newly created object.
- 30. Inheritance JavaScript supports inheritancehierarchies through prototyping in the manner of Self.
- 32. Encapsulation Encapsulation includes theidea that the data of an object should not be directly exposed.
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- 35. Always follow team’scode convention!
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- 37. 1. “Clean Code:A Handbook of Agile Software Craftsmanship” (Robert Martin) 2. “Even Faster Web Sites” (Steve Souders) 3. “Maintainable JavaScript” (Nicholas Zakas) 4. w3schools.com 5. javascripttoolbox.com 6. tutsplus.com
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