Where to use which variable
- It’s tempting to resort to global variables for their apparent simplicity, but they often lead to issues. Since any function can modify a global variable, it’s easy to unintentionally alter them or make errors like misspelling variable names, especially in larger applications. Debugging such issues can become cumbersome.
- In contrast, local variables offer a solution by reducing the risk of naming conflicts. Different functions can use identical names for local variables without causing clashes. This minimizes errors and debugging challenges. Therefore, except for a few specific cases, it’s advisable to encapsulate code within functions to ensure variables remain local.
- Remember, misspelling a variable name that’s already declared results in a new global variable being created. To prevent this, always declare variables with keywords and ensure they’re declared before use in the code.
Note: Use local variables whenever possible. Always use the var keyword to declare a new variable before the variable is referred to by other statements.
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