Can you explain what the keyword 'case' means in the Dart language and how it is used in program flow control?

In the Dart language, the keyword case is used inside the switch statement to define specific options that an expression can be compared against. It helps manage the flow of execution by allowing a specific block of code to be executed depending on the value of a variable.

Example of usage:

var day = 3;
switch (day) {
  case 1:
    print('Monday');
    break;
  case 2:
    print('Tuesday');
    break;
  case 3:
    print('Wednesday');
    break;
  default:
    print('Other day');
}

Here, if day equals 3, the code block under case 3 will be executed. The case keyword helps structure the code, making it more readable and manageable when dealing with multiple conditions.