Swift Set forEach()

var information: Set = ["Charlie", "Harvey", "Donna"]

// use forEach() to iterate through a set
information.forEach { info in
  print(info)
}

// Output: 
// Charlie
// Donna
// Harvey

forEach() Syntax

The syntax of the forEach() method is:

set.forEach{iterate}

Here, set is an object of the Set class.

forEach() Parameters

The forEach() method takes one parameter:

• iterate - a closure body that takes an element of the set as a parameter.

forEach() Return Value

• The forEach() method doesn't return any value. It just iterates through the set.

Example 1: Swift set forEach()

// create a set numbers
var numbers: Set = [2,4,6,8,10]

// use forEach() to iterate through a set
numbers.forEach { number in
  print(number)
}

Output

6
8
2
4
10

In the above example, we have created a set named numbers and we have used the forEach() method to iterate through it. Notice the closure body,

{ number in 
  print(number)
}

Here, number represents each element of numbers. And each element is printed during each iteration.

Example 2: forEach vs for Loop

// create a set numbers
var numbers: Set = [1,2,3]

print("Using forEach():")

// use forEach() to iterate through a set
numbers.forEach { number in
  print(number)
}

print("Using for loop:")

// use for loop to iterate through a set
for number in numbers {
    print(number)
}

Output

Using forEach():
3
1
2
Using for loop:
3
1
2