combine two maps in swift

To combine two Swift maps, you can use the merge method. This method takes in a dictionary and merges its key-value pairs into the calling dictionary.

Here's an example of how to use the merge method to combine two maps in Swift:

main.swift
var map1 = ["apple": 3, "banana": 2]
let map2 = ["orange": 4, "pear": 1]

map1.merge(map2) { (current, new) in new }

print(map1) // Output: ["banana": 2, "orange": 4, "apple": 3, "pear": 1]
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In the above example, we create two maps (map1 and map2) and merge map2 into map1 using the merge method. We don't need to worry about duplicates as the merge method handles that for us.

We also provide a closure to the merge method, which takes the current and new values for any duplicate keys. In this example, we simply take the new value over the current one.

After merging map2 into map1, we print out the resulting map. The output will be ["banana": 2, "orange": 4, "apple": 3, "pear": 1].