[Solved] How can you merge two Swift dictionaries so that values from the second overwrite duplicates in the first?let dict1 = ["a": 1, "b": 2] let dict2 = ["b": 3, "c": 4] // Fill in code here | Swift

Swift - Collections

How can you merge two Swift dictionaries so that values from the second overwrite duplicates in the first?

let dict1 = ["a": 1, "b": 2]
let dict2 = ["b": 3, "c": 4]
// Fill in code here

Alet merged = dict1.union(dict2)

Blet merged = dict1 + dict2

Clet merged = dict1.merging(dict2) { (_, new) in new }

Dlet merged = dict1.append(contentsOf: dict2)

Step-by-Step Solution

Solution:

Step 1: Use merging method with closure
merging(_:uniquingKeysWith:) merges dictionaries, resolving duplicates with closure.
Step 2: Provide closure to keep new values
The closure { (_, new) in new } keeps the value from dict2 when keys duplicate.
Final Answer:
let merged = dict1.merging(dict2) { (_, new) in new } -> Option C
Quick Check:
Use merging with closure to combine dictionaries [OK]

Quick Trick: Use merging with closure to overwrite duplicate keys [OK]

Common Mistakes:

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