Remove the duplicate element From the array through map in swift

Question

I got error

Anonymous closure argument not contained in a closure

I have a array as shown below and I want to remove the duplicate element to get a new array without any duplicacy , My code of swift is :-

let oldArray = [1,2,3,4,5,6,7,8,91,2,3,6]
var newArray = oldArray.map( $0 != $1)
print(newArray)

Thanks in advance

Besides the bad syntax, the `map` closure only has one argument, not two. — rmaddy, Sep 03 '18 at 14:52
@rmaddy I am new to swift please let me know how can I do so using map and filter — piyush ranjan, Sep 03 '18 at 14:57
You can't use `map` for this. `map` is for transforming the values of the array into different values. — rmaddy, Sep 03 '18 at 15:11

Sh_Khan · Accepted Answer · 2018-09-03T15:13:55.993

1

You can try

let newArray = Array(Set(oldArray))

OR

let oldArray = [1,2,3,4,5,6,7,8,91,2,3,6]
var newArray = [Int]()
oldArray.forEach {
    if !newArray.contains($0) {
        newArray.append($0)
    } 
}
print(newArray)

edited Sep 03 '18 at 15:13

answered Sep 03 '18 at 15:03

Sh_Khan

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This would be extremely inefficient for larger collections. Better to use a set and filter only the objects that are actually inserted – Leo Dabus Sep 03 '18 at 17:37
@LeoDabus i added the other way to clarify that to the op , he has to use option #1 – Sh_Khan Sep 03 '18 at 17:41

Remove the duplicate element From the array through map in swift

1 Answers1