A **loop** is used to execute a sequence of statements multiple times until the stated condition becomes false. A loop usually consists of two parts:
 * the code to execute 
* the condition that needs to hold true for the loop to execute

Swift has multiple kinds of loops such as:`for-in`, `for-each`, and `while` loops for repeated execution of a set of statements.

# For loop
A **for loop** is used to iterate over dictionaries, arrays, and collections. It goes over each item in these data structures and executes a set of instructions if an item still remains.


The code below shows how the two kinds of #key# for loops: `for-in` loop and `for-each` loop #key# can be used:

import Swift

// For-in loop
let ages = ["John": 28, "Sarah": 12, "Jack": 72]
for (name, age) in ages {
    print("\(name) is \(age) years old")
}

let names = ["Jack", "Sarah", "John"]
for name in names {
    print(name)
}

// For-each loop
print("\n Using the for each loop \n")

let newAges = ["John": 28, "Sarah": 12, "Jack": 72]
newAges.forEach { name, age in
    print("\(name) is \(age) years old")
}

let newNames = ["Jack", "Sarah", "John"]
newNames.forEach { name in
    print(name)
}

A `for-each` loop is different from a `for-in` loop in that neither the `break` nor the `continue` statements can be used. 

# While loop
A **`while` loop** executes a set of statements until a condition becomes `false`. The total number of iterations are not known while executing a `while` loop. 

The code below shows how the `while` loop is used:


import Swift

var num = 0

while num < 5 {
  print( "Value of number is \(num)")
  num = num + 1
}

How to create loops in Swift

Swift loops include for-in, for-each, and while, which vary by use and iteration control.