Identity operators (=== and !==) in Swift - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to check if two class instances refer to the same object.

Swift

if object1 [1] object2 {
    print("Same instance")
}

Drag options to blanks, or click blank then click option'

A==

B!==

C!=

D===

Attempts:

3 left

💡 Hint

Common Mistakes

Using == instead of === to check identity.

Confusing identity operators with equality operators.

In Swift, the identity operator to check if two references point to the same instance is ===.

2fill in blank

medium

Complete the code to check if two class instances do NOT refer to the same object.

Swift

if objectA [1] objectB {
    print("Different instances")
}

Drag options to blanks, or click blank then click option'

A!==

B==

C!=

D===

Attempts:

3 left

💡 Hint

Common Mistakes

Using != instead of !== for identity comparison.

Using equality operators instead of identity operators.

The operator !== checks if two references do not point to the same instance.

3fill in blank

hard

Fix the error in the code to correctly check identity between two instances.

Swift

if person1 [1] person2 {
    print("They are the same person")
}

Drag options to blanks, or click blank then click option'

A===

B==

C!=

D!==

Attempts:

3 left

💡 Hint

Common Mistakes

Using == which checks value equality, not identity.

Using !== which checks for non-identity.

Use === to check if two class instances are the same object in memory.

4fill in blank

hard

Fill both blanks to create a condition that prints "Same" if two objects are identical and "Different" if not.

Swift

if obj1 [1] obj2 {
    print("Same")
} else if obj1 [2] obj2 {
    print("Different")
}

Drag options to blanks, or click blank then click option'

A===

B==

C!==

D!=

Attempts:

3 left

💡 Hint

Common Mistakes

Using equality operators (==, !=) instead of identity operators.

Mixing up the order of operators.

The first blank uses === to check identity, the second uses !== to check non-identity.

5fill in blank

hard

Fill both blanks to create a function that returns true if two references are identical and false otherwise.

Swift

func areIdentical(_ a: AnyObject, _ b: AnyObject) -> Bool {
    return a [1] b [2] true : false
}

Drag options to blanks, or click blank then click option'

A===

B==

C?

D:

Attempts:

3 left

💡 Hint

Common Mistakes

Using equality operator instead of identity operator.

Forgetting to use the ternary operator correctly.

The function uses the identity operator === and the ternary operator ? : to return true if identical, else false.