Swift String hasPrefix()

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:

1. str - check whether string starts with str or not

hasPrefix() Return Value

The hasPrefix() method returns:

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

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

Penned by Kris
Some other artist