Javascript best practices

Variables

• Avoid global variables
  • variables created outside of a function are global variables
  • variables created with no keyword are global variables
• Use const or let to declare variables

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• Variables can be accessed in local scope or global scope.

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• Local and global variable with the same name => javascript will prioritize the local variable.

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• Local variables are deleted once the local execution context is complete.

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• Minifiers can only rename local variables when it is safe to do so.