ex-rhino.js

importPackage(java.io);
importPackage(java.lang);

System.out.println("JavaScript!");

// create some variables to use
// TERM: assignment
var a = 1;
var b = 2;
var c = 3;
var d = 4;
var e = 5;

// total the numbers
// TERM: operation, operators
var total = a + b + c + d + e;

// variable to indicate if we should System.out.println the total
var should_print_total = true;

// output the total (if the variable is set)
// TERM: concatenation, conditional, boolean, coercion, control flow
if(should_print_total) {
 System.out.println("The total is " + total.toString() + "\n");
}

// output the total if it is equal to
if (total === 15) {
  System.out.println("The total was 15 just like we wanted\n");
}

// create a list of numbers
// TERM: list, array
var list = [a, b, c, d, e];

// how many numbers do we have?
// TERM: method, interpolation
var count = list.length;
System.out.println("There are " + count + " numbers in the list");

// output each number
// TERM: iteration, interpolation
list.forEach(function(value, index, array) {
  System.out.println("The number " + value + " is at index " + index + " in the list");
});

// are the numbers even or odd?
// TERM: iteration, branching logic (with else), (danger: scope of i is global)
for (var i=0;  i < list.length; i++) {
  if (list[i] % 2 == 0) {
    System.out.println(list[i] + " is even");
  } else {
    System.out.println(list[i] + " is odd");
  }
}

// is there a quicker way to get the total? in this language?
// TERM: reduce, method, interpolation
total = list.reduce(function(a, b) {
  return a + b;
});

System.out.println("The total is " + total);