如何从数组中生成swift中的字典

Question

var tempsArray = [65,62,63,64,67,68,69,68,67,65,63,65,65]

func createCoordinates(temps: [Int]) -> Dictionary<Int, Int> {
    var tempCoordinates = [Int: Int]()

    for temperature in temps {
        tempCoordinates[temperature] = temps[temperature]
    }

    return tempCoordinates
}

createCoordinates(tempsArray)

The goal is a function that takes an array of Ints as its only parameter and returns a dictionary of coordinates. In this case the goal is (0:65,1:62,2:63,...)

My code is not executing and is giving me an error of "Array index out of range"

Answer 1

This is easy to achieve with enumerate() :

let tempsArray = [65,62,63,64,67,68,69,68,67,65,63,65,65]

var dict = [Int:Int]()
for (index, value) in tempsArray.enumerate() {
    dict[index] = value
}

print(dict)

Result:

[12: 65, 10: 63, 5: 68, 7: 68, 0: 65, 11: 65, 3: 64, 2: 63, 4: 67, 9: 65, 6: 69, 8: 67, 1: 62]

Remember that dictionaries are unordered collections.

I believe it will be easy for you to adapt this simple example to your needs. If not, tell me where you're stuck and I'll help.

Answer 2

More simple form:

tempsArray.reduce([Int:Int]()) {
    (var d, v)->[Int:Int] in
    d[d.count] = v
    return d
}