Web Reference: Nov 21, 2023 · A variable whose name begins with an uppercase letter (A-Z) is a constant. A constant can be reassigned a value after its initialization, but doing so will generate a warning. Global variables begin with $. Uninitialized global variables have the value nil and produce warnings with the -w option. Assignment to global variables alters the global status. It is not recommended to use global variables. They make programs cryptic. Here is an example showing the usage of global variable. Here $global_variable is a global varia... Ruby Constant: A type of variable that starts with an uppercase letter & shows a warning if you try to change it. See examples & more details in this post!
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