CODEWITHSUNDEEP
swiftxcode
Xdf123
Xdf123

Reputation: 39

swift programming language

I'm trying to learn a new coding language called swift. But I got a question in mind. 

import UIkit

func makeACake (cash:Double, ratio:Double){
print(Making \(cash*ratio)pounds of cake")
}

makeACake(cash:10,ratio:3)

// it will print making 30.0 pounds of cake.

just two questions here.

no.1 why cant i just call makeACake(10,3) why do i have to type it in this manner makeACake(cash:10,ratio:3)

no.2 is the function println removed from swift? why cant i use the function println and it asked me to use print instead.

sorry if i happened to ask any stupid question. but yea just trying to learn coding so maybe help a newbie out? thank you and bless the person who would be kind enough to help me and let me move on.

Upvotes: 0

Views: 696

Answers (1)

Devang Tandel
Devang Tandel

Reputation: 3008

Every programing language has their own syntax.

Basically, this syntax is acquired from their parent language. The syntax is getting changed in every update. I have started with swift2 and lot has been changed from swift2 to swift4.

So answering your question,

Answer 1: (_) Underscore --> It is Wildcard pattern

A wildcard pattern matches and ignores any value and consists of an underscore (_). Use a wildcard pattern when you don’t care about the values being matched against.

In your example, It means that argument labels are not necessary on invocation of your function.

Learn more about patter at: https://developer.apple.com/library/content/documentation/Swift/Conceptual/Swift_Programming_Language/Patterns.html

So if you dont want to write parameter name write:

func makeACake ( _ cash:Double, _ ratio:Double){}

Answer 2: print: Introduce First in swift2, we used to type println in swift. Now you might ask why println was removed, and the answer is simple "It is no longer required".

Let me take a simple example:

println("Hello")
println("World")

output: (One next line is extra in output, don't know how to format it here)

Hello

World

While with print

print("Hello")
print("World")

output: HelloWorld

Later in swift2 println was deprecated and the same("Next Line") output can be achieved with print itself.

"Evolution" They are making swift "Easy to Learn", "Easy to code" language

Upvotes: 1

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