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val.scaleBy( 3 )

val.scaleBy( 30 )

val.scaleBy( 300 )

When we run the above program using playground, we get the following result:

9

15

270

450

81000

135000

Self Property for Mutating Method

Mutating methods combined with 'self' property assigns a new instance to the defined
method.

struct area {

var length = 1

var breadth = 1

func area() - > Int {

return length * breadth

}

mutating func scaleBy(res: Int) {

self.length *= res

self.breadth *= res

println(length)

println(breadth)

}

}

var val = area(length: 3 , breadth: 5 )

val.scaleBy( 13 )

When we run the above program using playground, we get the following result.