swift function in a variable

// To create a variable type 'var' 'varName' = '"String" or Int'
var wallet = 100
var name = Joe

//function trying to be called

func aFunction() {
	print("called function")
}

//call function like this

aFunction()

var pendingFunction: ((Double, Double) -> Double)

func aFunction() -> <RETURN_TYPE> {
	return <RETURN_TYPE>
}

//call function like this
aFunction()