find the standard deviation of all keys in a map in swift

You can use Swift's built-in Statistics library to calculate the standard deviation of all the values in a map. First, you will need to extract all the values from the map into an array. Then, you can pass that array to the standardDeviation method of the Statistics library.

Here's the code:

main.swift
import Foundation

let myMap = ["key1": 10, "key2": 20, "key3": 30]

let valuesArray = Array(myMap.values)

let standardDeviation = valuesArray.standardDeviation // this is the standard deviation of all the values in the map

print(standardDeviation)
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This code will output the standard deviation of all the values in the map. Note that you need to import the Foundation library to use the Statistics library.