How do I concatenate or merge arrays in Swift?

arrays swift merge
Hristo picture Hristo · Aug 5, 2014 · Viewed 242.3k times · Source

If there are two arrays created in swift like this:

var a:[CGFloat] = [1, 2, 3]
var b:[CGFloat] = [4, 5, 6]

How can they be merged to [1, 2, 3, 4, 5, 6]?

Answer

Martin R picture Martin R · Aug 5, 2014

You can concatenate the arrays with +, building a new array 

let c = a + b
print(c) // [1.0, 2.0, 3.0, 4.0, 5.0, 6.0]

or append one array to the other with += (or append):

a += b

// Or:
a.append(contentsOf: b)  // Swift 3
a.appendContentsOf(b)    // Swift 2
a.extend(b)              // Swift 1.2

print(a) // [1.0, 2.0, 3.0, 4.0, 5.0, 6.0]

Related questions

Split a String into an array in Swift?

Say I have a string here: var fullName: String = "First Last" I want to split the string base on white space and assign the values to their respective variables var fullNameArr = // something like: fullName.explode(" ") var firstName: String = fullNameArr[0] var …

Read More
How to find index of list item in Swift?

I am trying to find an item index by searching a list. Does anybody know how to do that? I see there is list.StartIndex and list.EndIndex but I want something like python's list.index("text").

Read More
How to iterate a loop with index and element in Swift

Is there a function that I can use to iterate over an array and have both index and element, like Python's enumerate? for index, element in enumerate(list): ...

Read More