Getting data from array of dictionaries in an array

Question

I have created an Array of Dictionaries:

let tempArray = [["id":"1","Name":"ABC"],["id":"2","Name":"qwe"],["id":"3","Name":"rty"],["id":"4","Name":"uio"]]

Now I have to create an array of Name only.

What I have done is this:

var nameArray = [String]()
for dataDict in tempArray {
    nameArray.append(dataDict["Name"]!)
}

But is there any other efficient way of doing this.

try to implement getter setter so after adding data in array you can fetch the require data using loop or flap map as you like. — Ravi Panchal
– Ravi Panchal, Commented Feb 6, 2018 at 7:59

pacification · Accepted Answer · 2018-02-06 08:06:17Z

4

You can use flatMap (not map) for this, because flatMap can filter out nil values (case when dict doesn't have value for key "Name"), i.e. the names array will be defined as [String] instead of [String?]:

let tempArray = [["id":"1","Name":"ABC"],["id":"2","Name":"qwe"],["id":"3","Name":"rty"],["id":"4","Name":"uio"]]
let names = tempArray.flatMap({ $0["Name"] })
print(names) // ["ABC", "qwe", "rty", "uio"]

edited Feb 6, 2018 at 8:06

answered Feb 6, 2018 at 7:56

pacification

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1 Comment

Amit Over a year ago

Thank you. your logic executed faster.

Krunal · Accepted Answer · 2018-02-06 08:14:10Z

3

Use compactMap as flatMap is deprecated.

let tempArray = [["id":"1","Name":"ABC"],["id":"2","Name":"qwe"],["id":"3","Name":"rty"],["id":"4","Name":"uio"]]
let name = tempArray.compactMap({ $0["Name"]})
print(name)

answered Feb 6, 2018 at 8:14

Krunal

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1 Comment

Krunal Over a year ago

@Cristik - With Xcode 9.3, Apple itself suggest replacing flatMap with compactMap. Although, you are right. Let check more detail and comparison between both, and hat should be better. Thanks for your remarks.

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