max, min

Int.max
Int.min

Float.infinity
–Float.infinity

Double.infinity
–Double.infinity

label vs no label vs “_”

Below are the ways passing variables

func myFunc(label name: Int, lable name2: Int, age: Int, _ value: String) {

    print(name)

    print(name2)

    print(age)

    print(value)

}

myFunc(label: 4, lable: 3, age: 5, “aa”)

default, no value

var a: String?

In this case, a is a String type with nil as value.

struct vs class

struct is value type. class is reference type like in Java.

Array, String, Dictionary are all value types. class supports inheritance.

struct Resolution {
    var height = 0
}

var s = Resolution()
var ss = s
ss.height = 1

print(s.height) // 0
print(ss.height) // 1

class Resolution {
    var height = 0
}

var s = Resolution()
var ss = s
ss.height = 1

print(s.height) // 1
print(ss.height) // 1

for..loop

var arr = ["a", "b", "c"]
for i in 0...2 {
    print(arr[i])
}

var arr = ["a", "b", "c"]

for (idx, ele) in arr.enumerated() {
    print(String(idx) + ele)
}

var a = 1
while (true) {
    print(1)
}

struct is value type. class is reference type like in Java.