JavaScript: Best Practices for Data

Learn best practices for keeping your JavaScript application’s data and data structures clean, uncluttered, and efficient.

Introduction

• Working effectively with JavaScript data
• What you should know
• Setting up your environment

1. Why Best Practices?

• Understanding style guides
• Using modern deployment tools
• Understanding ESLint
• Foundational practice: Always use strict mode

2. Declaring Variables

• Prefer const, then let
• Use individual statements to create variables
• Create descriptive variable names
• Standardize acronym case
• Remove unused variables
• Challenge: Declare variables
• Solution: Declare variables

3. Assigning Values

• Don't assign variables in chains
• Standardize quotes
• Create arrays and objects using literals
• Quote object property names consistently
• Challenge: Assign values
• Solution: Assign values

4. Type Casting

• Type cast strings with the String wrapper
• Type cast numbers with the Number wrapper
• Type cast Booleans using double negation
• Rely on implicit Boolean values in conditionals
• Challenge: Type cast
• Solution: Type cast

5. Comparing Values

• Use triple-character equality operators
• Don't use Yoda conditions
• Compare appropriately for the data type
• Use ternary statements judiciously
• Add parentheses to clarify logic
• Challenge: Compare values
• Solution: Compare values

Conclusion

• Next steps