Created
August 30, 2018 05:08
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Object Drills
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function createMyObject() { | |
const myObject = {}; | |
myObject.foo = "bar"; | |
myObject.answerToUniverse = 42; | |
myObject['olly olly'] = 'oxen free' | |
myObject.sayHello = function(){ return "hello"} | |
return myObject | |
} | |
/* 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!'); | |
})(); |
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const sampleObj = { | |
foo: 'foo', | |
bar: 'bar', | |
bizz: 'bizz', | |
bang: 'bang', | |
}; | |
function keyDeleter(obj) { | |
delete obj.foo | |
delete obj.bar | |
return obj | |
} | |
/* 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: `keyDeleter` works correctly!'); | |
})(); |
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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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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!'); | |
})(); |
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