Swift String hasPrefix()

In this tutorial, we will learn about the Swift String hasPrefix() method with the help of examples.

The hasPrefix() method checks whether the string begins with the specified string or not.

Example

var str = "Kathmandu"

// checks if "Kathmandu" starts with "Kath"
print(str.hasPrefix("Kath"))

// Output: true

hasPrefix() Syntax

The syntax of the string hasPrefix() method is:

string.hasPrefix(str: String)

Here, string is an object of the String class.

hasPrefix() Parameters

The hasPrefix() method takes a single parameter:

str - check whether string starts with str or not

hasPrefix() Return Value

The hasPrefix() method returns:

true - if the string begins with the given string
false - if the string doesn't begin with the given string

Note: The hasPrefix() method is case-sensitive.

Example 1: Swift string hasPrefix()

var str = "Swift Programming"

print(str.hasPrefix("Swift")) // true
print(str.hasPrefix("S")) // true
print(str.hasPrefix("Swift Program")) // true

print(str.hasPrefix("swift")) // false
print(str.hasPrefix("wif")) // false

Output

true
true
true
false
false

Example 2: Using hasPrefix() With if...else

var song = "For the good times"

// true because song has "For the" prefix
if(song.hasPrefix("For the")) {

  print ("Penned by Kris")
} 
else {
  print ("Some Other song ")
}

// false because song doesn't have "Good time" prefix
if(song.hasPrefix("Good times")){

  print ("Penned by Bernard")
}
else{
  print ("Some other artist ")
}

Output