Filter array by values below specific number

Question

I have this array:

let numbers = [0,1,2,3,4,5,6,7,8,9]

And I want to append all numbers below 6 in this array below:

var belowSix = [Int]()

Here is what I have done and it works:

for number in numbers {
    if number < 6 {
        belowSix.append(number)
    }
}

Question:
It feels like this can be done in a smoother way, any suggestions?

@SameSome What if your number array is [0,1,2,3,4,2,5,6,7,8,9] in this case it will not show 5 in your belowSix array if you use prefix(6) so better if you use filter not the prefix because prefix is used to get specific objects from array starting — Nirav D
– Nirav D, Commented May 31, 2017 at 12:11
@SameSome Have you tried prefix(6) with array [0,1,2,3,4,2,5,6,7,8,9], You will not get your desired result — Nirav D
– Nirav D, Commented May 31, 2017 at 13:03

Nirav D · Accepted Answer · 2017-05-31 11:59:18Z

3

Yes, You can use filter for that.

let belowSix = numbers.filter { $0 < 6 }

answered May 31, 2017 at 11:59

Nirav D

72.6k12 gold badges168 silver badges187 bronze badges

Sign up to request clarification or add additional context in comments.

Comments

Rashwan L · Accepted Answer · 2017-05-31 12:14:54Z

0

If you want (up to) first 6 elements:

var belowSix = numbers.prefix(6)

If you want to get all elements below 6 use:

let belowSix = numbers.filter { $0 < 6 }

answered May 31, 2017 at 11:59

Rashwan L

38.9k7 gold badges108 silver badges113 bronze badges

If the array is not sorted (and if does not contain all numbers), then prefix(6) won't work.

As OP wrote it always is.

Try this on an array with duplicates, even if it is sorted - say, [1,1,2,2,2,3,4,4,5,5,5,5,5]

Also what if array is having less object than 6 like [2,5,6,7,8]

@NiravD, then it will show all the values if it´s below.