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Arrays are a fundamental concept in programming, and they play a big role in Swift too. They’re essentially a collection of values, all stored together in one place. When you have a set of values that belong together, such as a list of names or a set of numbers, it’s often more convenient to store them in an array.
In Swift, an array is declared by placing square brackets [] after the type of value that the array will hold. For example, if you want to create an array of integers, you would write “var numbers: [Int]” to declare it. You can also use square brackets to initialize an array with values, like so: “var names = [“John”, “Jane”, “Jim”]”.
Once you’ve created an array, you can access individual values within it using index numbers. Just like how you would refer to a specific page in a book using its page number, you can refer to a specific item in an array using its index number. In Swift, arrays are zero-indexed, meaning that the first item in the array has an index of 0, the second item has an index of 1, and so on.
To add new values to an array, you can use the “append” method. For example, “names.append(“Jack”)” would add “Jack” to the end of the “names” array. To insert an item at a specific index, you can use the “insert” method, like so: “names.insert(“Jill”, at: 1)”. This would insert “Jill” at index 1, shifting all other items in the array to the right.
You can also remove items from an array using the “remove” method. For example, “names.remove(at: 1)” would remove the item at index 1.
Arrays are a powerful tool for organizing and manipulating data in your programs. By using arrays, you can store and manipulate large amounts of data in an efficient, organized manner. Whether you’re just starting out with Swift or you’re an experienced programmer, understanding how to work with arrays is an important skill to have.
Cookbook – SWIFT for Beginners – Chapter 06 : Arrays
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