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iOS Swift Basics (retired) Collections What is a Dictionary?

Jesse Mikkonen
Jesse Mikkonen
1,939 Points
Posted by Jesse Mikkonen
Jesse Mikkonen
1,939 Points

Creating a constant from a dictionary?

Why is not compiling? Is this not the correct way to access a value from a dictionary to create a constant?

dictionaries.swift 
let currencies = ["US":"Dollar","UK":"Pound","JP":"Yen"]

let ukCurrency = ["UK"]
Jesse Mikkonen
Jesse Mikkonen
1,939 Points
Jesse Mikkonen
Jesse Mikkonen
1,939 Points

Code runs fine on xCode, problem with the built in compiler?

1 Answer

Jhoan Arango
Jhoan Arango
14,575 Points
Jhoan Arango
Jhoan Arango
14,575 Points

Hello :

To get the value of a dictionary, you have to use it's key, but also you have to point to which dictionary you are getting the key from. 

let dictionary = ["Key": "Value"]

// Getting value

dictionary["Key"]

// This will return the value of a given key

// Capturing the value in a constant. 

let captureValue = dictionary["Key"]

That's how you assign a value from a dictionary to a constant or variable.

Hope this helps you solve your challenge.

Good luck.

Jesse Mikkonen
Jesse Mikkonen
1,939 Points
Jesse Mikkonen
Jesse Mikkonen
1,939 Points

Thank you, this explains it :)