I have an array and I want to merge it.
This is the array:
let numbers = [ [ 1, 2, 3 ], [ 4, 5, 6 ] ]
I need a output like this:
let result = [ [ 1, 4 ], [ 2, 5 ], [ 3, 6 ] ]
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Does the first array has only two elements all the time?uditha– uditha2022-03-30 05:31:49 +00:00Commented Mar 30, 2022 at 5:31
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2 Answers
let numbers = [[1,2,3], [4,5,6]]
let result = zip(numbers[0], numbers[1]).map { [$0.0, $0.1]}
print(result) // -> [[1, 4], [2, 5], [3, 6]]
If the array has more elements the following would work.
let numbers = [[1,2,3], [4,5,6], [7,8,9]]
var result : [[Int]] = []
for n in 0...numbers.first!.count-1{
result.append(numbers.compactMap { $0[n] })
}
print(result) // -> [[1, 4, 7], [2, 5, 8], [3, 6, 9]]
1 Comment
RTXGamer
The second approach won't print the desired output if the input is
[[1, 2, 3], [4, 5, 6]]You can use the zip global function, which, given 2 sequences, returns a sequence of tuples and then obtain an array of tuples by using the proper init.
var xAxis = [1, 2, 3, 4]
var yAxis = [2, 3, 4, 5]
let pointsSequence = zip(xAxis, yAxis)
let chartPoints = Array(pointsSequence)
print(chartPoints)
And then you can access the tuples like this :
let point = chartPoints[0]
point.0 // This is the 1st element of the tuple
point.1 // This is the 2nd element of the tuple
