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function keyDeleter(obj) {
obj.delete='foo';
obj.delete='bar';
return obj;
}
var sampleObj = {
foo: 'foo',
bar: 'bar',
bizz: 'bizz',
bang: 'bang'
};
/* From here down, you are not expected to
understand.... for now :)
Nothing to see here!
*/
(function testKeyDeleter() {
var obj = keyDeleter({
foo: 'foo',
bar: 'bar',
bizz: 'bizz',
bang: 'bang'
});
if (typeof obj !== 'object') {
console.error('ERROR: `keyDeleter` must be return an object');
return false
}
['foo', 'bar'].forEach(function(key) {
if (key in obj) {
console.error('`keyDeleter` did not delete the key for ' + key);
return false;
}
});
['bizz', 'bang'].forEach(function(key) {
if (!(key in obj && obj[key] === key)) {
console.error('`keyDeleter` is deleting keys other than `foo` and `bar`');
return false;
}
});
console.log('SUCCESS: `updateObject` works correctly!');
})();
function createMyObject() {
return {
foo: 'bar',
answerToUniverse: 42,
'olly olly': 'oxen free',
sayHello: function() {
return 'hello';
}
};
}
/* From here down, you are not expected to
understand.... for now :)
Nothing to see here!
*/
(function testCreateMyObject() {
var obj = createMyObject();
if (typeof obj !== 'object') {
console.error('ERROR: `createMyObject` must return an object');
return false
}
var expectedKeys = ['foo', 'answerToUniverse', 'olly olly', 'sayHello'];
expectedKeys.forEach(function(key) {
if (!(key in obj)) {
console.error('ERROR: Missing a key for ' + key);
return false;
}
});
if (obj.foo !== 'bar') {
console.error('ERROR: Value for `foo` should be \'bar\' but was ' + obj.foo);
return false;
}
if (obj.answerToUniverse !== 42) {
console.error(
'ERROR: Value for `answerToUniverse` should be 42 but was ' + obj.answerToUniverse);
return false;
}
if (obj['olly olly'] !== 'oxen free') {
console.error(
'ERROR: Value for `\'olly olly\'` should be \'oxen free\' but was ' + obj['olly olly']);
return false;
}
if (!(typeof obj.sayHello === "function" && obj.sayHello() === 'hello')) {
console.error('ERROR: Value for `sayHello` must be a function that returns the string \'hello\'');
return false;
}
console.log('SUCCESS: Your function works!');
})();
function updateObject(obj) {
obj.foo = 'foo';
obj.bar = 'bar';
obj.bizz = 'bizz';
obj.bang = 'bang';
return obj;
}
/* From here down, you are not expected to
understand.... for now :)
Nothing to see here!
*/
(function testUpdateObject() {
var oldObj = {
cats: 'cats',
dogs: 'dogs',
};
var newObj = updateObject(oldObj);
if (typeof newObj !== 'object') {
console.error('ERROR: `createMyObject` must return an object');
return false
}
['foo', 'bar', 'bizz', 'bang'].forEach(function(key) {
if (!(key in newObj)) {
console.error('ERROR: `' + key + '` not in object returned by `updateObject`');
return false;
}
});
['foo', 'bar', 'bizz', 'bang'].forEach(function(key) {
if (newObj[key] !== key) {
console.error('ERROR: `' + key + '` should be "' + key + '" but was ' + newObj[key]);
return false;
}
});
if (!(newObj.cats === 'cats' && newObj.dogs === 'dogs')) {
console.error('ERROR: your function doesn\'t preserve existing key/value pairs');
return false;
}
console.log('SUCCESS: `updateObject` works correctly!');
})();
function personMaker() {
var person = {
firstName: 'Paul',
lastName: 'Jones',
fullName: function() {
return this.firstName + ' ' + this.lastName
}
};
return person;
}
/* From here down, you are not expected to
understand.... for now :)
Nothing to see here!
*/
(function testPersonMaker() {
var person = personMaker();
if (typeof person !== 'object') {
console.error('ERROR: `personMaker` must return an object');
return false
}
if (typeof person.fullName !== 'function') {
console.error('ERROR: `fullName` must be a method');
return false
}
if (person.fullName() !== 'Paul Jones') {
console.error('ERROR: The value for `fullName` should be "Paul Jones" but was ' + person.fullName());
return false;
}
person.firstName = 'Lisa';
person.lastName = 'Simpson';
if (person.fullName() !== 'Lisa Simpson') {
console.error(
'`personMaker` is not using self reference correctly. ' +
'When firstName set to "Lisa" and lastName set to "Simpson", ' +
'should return "Lisa Simpson" but returned ' + person.fullName()
)
}
console.log('SUCCESS: `updateObject` works correctly!');
})();
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