How to add an element to the start of an Array in Swift?

Published by donnywals on

You can use Array's insert(_:at:) method to insert a new element at the start, or any other arbitrary position of an Array:

var array = ["world"]
array.insert("hello", at: 0) // array is now ["hello", "world"]

Make sure that the position that you pass to the at: argument isn't larger than the array's current last index plus one. For example:

// this is fine
var array = ["hello"]
array.insert("world", at: 1)

// this will crash
var array = ["hello"]
array.insert("world", at: 2)

If you have any questions about this tip, or if you have feedback for me, don't hesitate to reach out on Twitter.

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Categories: Swift Tips