How to filter String array in Swift

Question

By using objective C I have filter year array by using NSPredicate,

Below is code.

  yearArray = [yearArray filteredArrayUsingPredicate:[NSPredicate
  predicateWithFormat:@"SELF != ''"]];

As per above code it's working fine in objective c , I have to filter array in Swift 3,

What is Input Year Array :-

( Year,"","","",JAN,"","","",FEB,"","","",MAR,"","","",APR,"","","",
  MAY,"","","",JUN,"","","",JUL,"","","",AUG,"","","",SEP,"","","",OCT
  ,"","","", NOV,"","","",DEC,"","","","",WIN,"","","",SPR,"","","",SUM
  ,"","","",AUT,"","","","",ANN)

Need filter Output Array

(Year,JAN,FEB,MAR,APR,MAY,JUN,JUL,AUG,SEP,OCT,NOV,DEC,WIN,SPR,SUM,AUT,ANN)

Please give solution how to filter array in swift.

Iulian Onofrei · Accepted Answer · 2017-08-30 14:49:08Z

5

Use this code:

let yearArray: [String] = ... // your array of type [String]

let filteredArray = yearArray.filter {
    !$0.isEmpty
}

Look at the picture for output:

edited Aug 30, 2017 at 14:49

Iulian Onofrei

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answered Aug 30, 2017 at 13:40

Aleksandr Honcharov

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8 Comments

Jaywant Khedkar Over a year ago

I have use your code , However it's showing error , Type of expression is ambiguous without more context.

Aleksandr Honcharov Over a year ago

is your array of type [String] or different?

Jaywant Khedkar Over a year ago

NSMutableArray of type string

Aleksandr Honcharov Over a year ago

If you use Swift, you should use Swift types if there is nothing special about your case. And instead of "NSMutableArray" you can use "var array: [String]".

Damien Over a year ago

If you still use Objective-c type you should still be able to use NSPredicate I think. But as Alexander said, it's better to use swift types when you're writing swift code !

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Damien · Accepted Answer · 2017-08-30 14:47:44Z

4

You can do it by using filter (on an Array type) :

let filteredArray = yearArray.filter{$0 != ""}

It's that simple.

If your array is an NSMutableArray, just cast it to [String] :

if let yearArray = yearArray as? [String] {
    let filteredArray = yearArray.filter{$0 != ""}
    // add your code here
}

edited Aug 30, 2017 at 14:47

answered Aug 30, 2017 at 13:42

Damien

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1 Comment

Alexander Over a year ago

!$0.isEmpty is preferable to $0 != "". It better communicate intent.

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