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  • Function inside a function

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    Functions are small modules or chunk of code. Swift’s function syntax is so flexible that it allows to write a function inside a function.

    Here is a syntax:

    func firstFunction(arguments) -> returnType{
    
    	func secondFunction(arguments) -> returnType{
    
    
    		func thirdFunction(arguments) -> returnType{
    
    			and so on.
    		}
    	}
    }
    

     

    Here is an example(code) from above syntax:

    func addRandomNumAndCheckIfOdd(inout passedNumber: Int) -> Bool {
            
    	passedNumber +=  Int(arc4random_uniform(UInt32(10))); // adding random number between 0-9 to passed number
            
            // function will check if the obtained number is Odd or not
    	func isOdd(numToCheck:Int)->Bool{
    
    		if numToCheck%2 == 0 {
                    
    			return false
    		}
    		return true
    	}
    	return isOdd(passedNumber)
    }
    


    In the above example we have created a function “addRandomNumAndCheckIfOdd” which will add a random number and check if it’s odd or not.

    We have passed an argument ‘passedNumber’ with reference so that it can be modified. A random number ranging from 0-9 will be added to passed number.
    while returning we are checking if the modified number is odd or not using function inside a function flexibility provided by swift.

    Function inside a function will not be executed until and unless it is called, compiler will skip the function otherwise.

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