How to check if a variable is null in JavaScript
Checking for null values is crucial for preventing runtime errors and handling optional data properly in JavaScript applications.
With over 25 years of experience in software development and as the creator of CoreUI, I’ve implemented null checks extensively in component prop validation and API response handling.
From my expertise, the most precise approach is using strict equality === null which specifically identifies null without conflating it with other falsy values.
This method provides exact null detection while maintaining code clarity and preventing unexpected behavior.
How to check the type of a variable in JavaScript
Checking variable types is essential for writing robust JavaScript code that handles different data types safely and predictably.
As the creator of CoreUI with over 25 years of JavaScript development experience, I’ve implemented countless type checks for component validation and data processing.
From my expertise, the most reliable approach is using the typeof operator for primitive types and additional checks for arrays and null values.
This combination provides comprehensive type detection for all JavaScript data types.
