Swift - Modifying Elements in an Array

Introduction

To change the value of an existing item in the array, specify the index of the item and assign a new value to it:

var OSes :[String]  = ["iOS", "Android", "Windows"]
OSes [3] = "WinPhone"

The array now contains the updated element:

You can only modify values of arrays that were declared using the var keyword.

If an array is declared using the let keyword, its values are not modifiable.

Related Topic

• Arrays
• Mutability of Arrays
• Array Data Types
• Retrieving Elements from an Array
• Inserting Elements into an Array
• Appending Elements to an Array
• Checking the Size of an Array
• Removing Elements from an Array
• Iterating over an Array
• Creating an Empty Array
• Testing Arrays for Equality

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