Arguments forEach function object
JavaScript
var logArrayElements = function(element, index, array) {
console.log('a[' + index + '] = ' + element);
};
// Note elision, there is no member at 2 so it isn't visited
[2, 5, , 9].forEach(logArrayElements);
// logs:
// a[0] = 2
// a[1] = 5
// a[3] = 9