Cookbook

Basics

- Create a Hello World app

- Declare a constant

- Declare a variable

- Write a For loop

- Write a Switch-Case statement

- Write a While loop

- Write an If-Else statement

Functions

- Declare a function

- Declare a function with arguments

- Declare a function with default values

- Declare a function with inout parameters

- Declare a function with return type

- Declare a function with variadic arguments

Classes

- Declare a class

- Declare a class with functions

- Declare a class with inheritance

- Declare a class with properties

- Extend an existing class

- Implement a singleton class

Closures

- Declare a closure

- Declare a closure with arguments

- Use closure as a parameter

Arrays

- Append array to array

- Append item to array

- Check if 2 arrays are equal

- Check if array contains element

- Check if array is empty

- Check if object is an array

- Concatenate arrays

- Create an empty array

- Filter an array based on condition

- Find element index in array by value

- Get array element at index

- Get first element of array

- Get last element of array

- Get maximum element from array

- Get minimum element from array

- Get the size of an array

- Insert item at array index

- Join array elements using separator

- Loop through array

- Loop through array with index

- Map an array to another array

- Pop last item from array

- Reduce array to a single value

- Remove all items from array

- Remove duplicates from array

- Remove item at array index

- Remove item from array by value

- Reverse an array

- Set array element at index

- Sort array in ascending order

- Sort array in descending order

- Swap 2 elements in array

Dictionaries

- Add item to dictionary

- Check if 2 dictionaries are equal

- Check if object is a dictionary

- Create an empty dictionary

- Get array of keys in dictionary

- Get array of values in dictionary

- Get dictionary value for key

- Get the size of a dictionary

- Loop through dictionary

- Remove all items from dictionary

- Remove item from dictionary with key

- Set dictionary element for key

Numbers

- Calculate power of a number

- Calculate square root of a number

- Convert integer to string

- Convert radians to degrees

- Convert string to integer

- Generate a random number

Exceptions

- Handle exceptions

- Throw and catch exceptions

Files

- Check if file exists

- Check if file is executable

- Check if file is writable

- Copy file to location

- Create a folder

- Delete a file

- Delete a folder

- Get attributes of file

- Get current directory path

- Get directory contents

- Get temporary directory path

- Move file to different location

- Read data from file

- Read string from file

- Rename a file

- Write data to file

- Write string to file

Date/Time

Shell

- Execute a shell command

- Execute a shell task asynchronously

- Get command line arguments

Web

- Download a webpage

- Make an HTTP request

- Make an HTTP request asynchronously

Generate a random number

Problem

I want to generate a random number, between 0 and N-1.

Recipe


// Generate a random number
// between 0 and 9 (10-1)

let rand = Int(arc4random_uniform(10))

print(rand)

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