Parsing command-line arguments

A server app that runs a batch job often takes parameter values from the command line. How can we get these values in our program?

How to do it...

The obvious way to parse command-line arguments is as follows (see command_line_arguments.dart):

void
 main(List<String> args) {
  print("script arguments:");
  for(String arg in args)
    print(arg);
}

Now, the command dart command_line_arguments.dart param1 param2 param3 gives you the following output:

script arguments:

param1

param2

param3

However, you can also test this from within Dart Editor, open the menu Run, and select Manage Launches (Ctrl + Shift + M). Fill in the parameters in the Script arguments window:

Script arguments

What if your parameters are in the key:value form, as shown in the following code?

par1:value1 par2:value2 par3:value3

In this case, use the following code snippet:

for(String arg in args) {
    List<String> par = arg.split(':');
    var key = par[0];
    var...