How to Declare Closure Syntax in Swift

Closure has no parameter, no return type

var closureEmpty:()->() = {
    print("no parameter, no return")
}
print(closureEmpty())

Alternative to do the same thing

var closeEmpty1:()->Void={
    print("no parameter, no return")
}
closeEmpty1()

Cloesure has no parameter, but return type

var clousre:()->String{
    return "hi"
}

Pass closure as parameter in Swift

func fun(num:Int, closure:(Int)->(Int)){
    print(closure(num))
}
var closePara:(Int)->(Int)={
    return $0*20
}
fun(num:10, closure:closePara)

Trailing Closure Syntax in Swift

It means Closure is the last parameter to the function

func tailClosure(num:Int, closure:()->()){
    print("Hello")
    closure()
}
tailClosure(num:3){
    print("Closure Block code")
}