how to access values in a dictionary using reduce in swift?

Question

I got the key from the dictionary using reduce like by doing the following:

let namesAndScores = ["Anna": 2, "Brian": 2, "Craig": 8, "Donna": 6]

 let namesString = namesAndScores.reduce("",
 combine: { $0 + "\($1.0), " })
 print(namesString)

But I would like to know how to get the value from the dictionary using the reduce ?.

Any help would be appreciated. Thanks.

In combine: { $0 + "\($1.0), " }), you use $1.0 to get the key from the dictionary, you also can use$1.1 to get the value. Is this you want? — mrfour
– mrfour, Commented Aug 8, 2016 at 23:46

Sentry.co · Accepted Answer · 2021-12-18 23:26:09Z

5

Accessing Value and Key w/ reduce 👌

let dict = ["John": "🔵", "Donna": "🔴"]

let str = dict.reduce("") {
   $0 + "\($1.key) likes the color: \($1.value) "
}   
print(str) // Donna likes the color: 🔴 John likes the color: 🔵

edited Dec 18, 2021 at 23:26

answered May 21, 2018 at 11:24

Sentry.co

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Comments

Luca Angeletti · Accepted Answer · 2016-08-08 23:42:34Z

2

I'll suggest you an easier way

let names = namesAndScores.keys.joinWithSeparator(", ")
//  Brian, Anna, Craig, Donna

let values = namesAndScores.values.map(String.init).joinWithSeparator(", ")
// 2, 2, 8, 6

Update: code for reduce

 let values = String(namesAndScores.values.reduce("") { "\($0), \($1)"}.characters.dropFirst(2))
// 2, 2, 8, 6

edited Aug 8, 2016 at 23:42

answered Aug 8, 2016 at 23:35

Luca Angeletti

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3 Comments

Abhinay Reddy Keesara Over a year ago

Thanks, But I know the way you mentioned.

Luca Angeletti Over a year ago

@AK1: Ok I will add the code for reduce then. One question: Why using reduce when there is an easier way?

Abhinay Reddy Keesara Over a year ago

That would be helpful. Nothing much learning swift and wanted to know how to do things.

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