Removing duplicates in an array

We can use reduce to remove duplicate elements in an array as follows:

let arrWithDuplicates = [1, 1, 2, 3, 3, 4, 4, 5, 6, 7] 

let arrWithoutDuplicates = arrWithDuplicates.reduce([]) { 
    (a: [Int], b: Int) -> [Int] in 
    if a.contains(b) { 
        return a 
    } else { 
        return a + [b] 
    } 
} 
print(arrWithoutDuplicates)

The result will be [1, 2, 3, 4, 5, 6, 7], as expected.

..................Content has been hidden....................

You can't read the all page of ebook, please click here login for view all page.
Reset