split a map into two maps in swift

To split a dictionary into two dictionaries in Swift, you can use the filter method and the subscript operator. You can iterate through the dictionary and use the filter method to return a new dictionary with only the elements that fulfill a certain condition. You can then use the subscript operator to remove these elements from the original dictionary and create a second dictionary with the remaining elements.

Here's an example implementation:

main.swift
var originalMap = ["a" : 1, "b" : 2, "c" : 3, "d" : 4]

let filteredMap = originalMap.filter { $0.value < 3 }

for (key, _) in filteredMap {
    originalMap.removeValue(forKey: key)
}

print(originalMap) // ["c": 3, "d": 4]
print(filteredMap) // ["a": 1, "b": 2]
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In this example, the original dictionary originalMap contains four key-value pairs. We use the filter method to create a new dictionary filteredMap that only contains the key-value pairs with a value less than 3. We then iterate through filteredMap, using the keys to remove the corresponding elements from originalMap. The result is that originalMap now contains only the elements that were not in filteredMap, and filteredMap contains only the elements that were in originalMap and fulfilled the condition.