グローバル配列の操作

  heroes                                           // root node,    valueless, 2 child nodes
     heroes('dogs')                                // level 1 node, valueless, 4 child nodes
        heroes('dogs','Balto') = 1919              // level 2 node, value=1919
        heroes('dogs','Hachiko') = 1923            // level 2 node, value=1923
        heroes('dogs','Lassie') = 1940             // level 2 node, value=1940, 1 child node
           heroes('dogs','Lassie','Timmy') = 1954  // level 3 node, value=1954
        heroes('dogs','Whitefang') = 1906          // level 2 node, value=1906
     heroes('sheep')                               // level 2 node, valueless, 1 child node
        heroes('sheep','Dolly') = 1996             // level 2 node, value=1996

// Iterate in reverse, seeking nodes lower than heroes('dogs','V') in collation order
  let iterDogs = irisjs.iterator('heroes','dogs').reversed().startFrom('V');

  let output = '\nDog birth years: ';
  for ([key,value] of iterDogs) {
    output += key + ':' + value + '  ';
  };
  console.log(output);

  Dog birth years: Lassie:1940  Hachiko:1923  Balto:1919

// Get a list of child subscripts under node heroes('dogs')
  let iterDogs = irisjs.iterator('heroes','dogs').keys();
  let output = "\nSubscripts under node heroes('dogs'): ";

  let iter = iterDogs.next();
  while (!iter.done) {
    output += iter.value + ' ';
    iter = iterDogs.next();
  }
  console.log(output);

  Subscripts under node heroes('dogs'): Balto Hachiko Lassie Whitefang

  function findAllHeroes() {
    const root = 'heroes';
    console.log('List all subnodes of root node '+root+':\n'+root)
    let iterRoot = irisjs.iterator(root);
    let hasChild = false;

    // Iterate over children of root node heroes
    for ([sub1,value] of iterRoot) {
      hasChild = testNode(value,root,sub1);

      // Iterate over children of heroes(sub1)
      if (hasChild) {
        let iterOne = irisjs.iterator(root,sub1);
        for ([sub2,value] of iterOne) {
          hasChild = testNode(value,root,sub1,sub2);

          // Iterate over children of heroes(sub1,sub2)
          if (hasChild) {
            let iterTwo = irisjs.iterator(root,sub1,sub2);
            for ([sub3,value] of iterTwo) {
              testNode(value,root,sub1,sub2,sub3); //no child nodes below level 3
            }
          } //end level 2
        }
      } //end level 1
    } // end main loop
  } // end findAllHeroes()

  function testNode(value, root, ...subs) {

  // Test for values and child nodes
    let state = irisjs.isDefined(root,...subs);
    let hasValue = (state%10 > 0); // has value if state is 1 or 11
    let hasChild = (state > 9);    // has child if state is 10 or 11

  // format the node address output string
    let subList = Array.from(subs);
    let level = subList.length-1;
    let indent = '  ' + String('      ').slice(0,(level*2));
    let address = indent + root+'(' + subList.join() + ')';

  // Add node value to string and note special cases
    if (hasValue) { // ignore valueless nodes
      address += ' = ' + value;
      for (name of ['Timmy','Dolly']) {
        if (name == subList[level]) {
          address += ' (not a dog!)'
        }
      }
    }
    console.log(address);
    return hasChild;
  }
}

List all subnodes of root node heroes:
heroes
  heroes(dogs)
    heroes(dogs,Balto) = 1919
    heroes(dogs,Hachiko) = 1923
    heroes(dogs,Lassie) = 1940
      heroes(dogs,Lassie,Timmy) = 1954  (not a dog!)
    heroes(dogs,Whitefang) = 1906
  heroes(sheep)
    heroes(sheep,Dolly) = 1996  (not a dog!)