The set built-in is the only way to set positional parameters $ set — this is a test $ echo $1 this $ echo $4 test where the — protects against things that look like options (e.g. -x). In your case you might want: if [ -z “$4” ]; then set — “$1” “$2” “$3” … Read more
Dart has two types of optional parameters: named and positional. Before I discuss the differences, let me first discuss the similarities. Dart’s optional parameters are optional in that the caller isn’t required to specify a value for the parameter when calling the function. Optional parameters can only be declared after any required parameters. Optional parameters … Read more