Lisa Bart and Millhouse, not members of Disney

lifo_example.js

var Child = function(name) {
    this.nextChild = null;
    this.name = name;
}

var DisneyClub = function() {
    this.toppen = null;

    this.shift = function(newTop) {
        newTop.nextChild = this.toppen;
        this.toppen = newTop;
    };

    this.pop = function() {
        if (this.toppen === null) {
            throw "DisneyClub has no children to pop";
        }
        var oldTop = this.toppen;
        this.toppen = oldTop.nextChild;
        return oldTop;
    };
}

var assertEquals = function(expected, actual) {
    if (expected !== actual) {
        throw "Expected " + expected + " but was " + actual;
    }
    console.log(".");
}

var test_adding_lisa_returns_lisa = function() {
    var club = new DisneyClub();
    var lisa = new Child("Lisa");
    
    club.shift(lisa);

    var topChild = club.pop();
    assertEquals(lisa.name, topChild.name);
}();

var test_adding_lisa_and_then_bart_returns_bart_then_lisa = function() {
    var club = new DisneyClub();
    var lisa = new Child("Lisa");
    var bart = new Child("Bart");
    
    club.shift(lisa);
    club.shift(bart);

    assertEquals(bart.name, club.pop().name);
    assertEquals(lisa.name, club.pop().name);
}();

var test_adding_lisa_millhouse_and_bart_returns_bart_then_lisa = function() {
    var club = new DisneyClub();
    var lisa = new Child("Lisa");
    var millhouse = new Child("Millhouse");
    var bart = new Child("Bart");
    
    club.shift(lisa);
    club.shift(millhouse);
    club.shift(bart);

    assertEquals(bart.name, club.pop().name);
    assertEquals(millhouse.name, club.pop().name);
    assertEquals(lisa.name, club.pop().name);
}();

var fail = function(errorMessage) {
    throw errorMessage;
}

var test_getting_top_on_empty_queue = function() {
    var club = new DisneyClub();

    try {
        club.pop();
        fail("Calling pop on empty queue should throw exception");
    } catch (errorCaught) {
        assertEquals("DisneyClub has no children to pop", errorCaught);
    }
}();

console.log("All tests run");
ceda@wendt-mbair:~/utbildning/yh-gbg/clean_code$