About Swift Syntax 3 (Frequently used functions on Integer, String)

About “Swift Syntax 3 (Frequently used functions on Integer, String)”

I had the opportunity to study iOS this week, and I’ve been working on grammar, so I thought I’d write a post to summarize it.

In this post, I’ll cover min and max for Integer and various functions for String.

The Integer type

The min and max functions

Global functions to find the smaller or larger of two integers.

Example

let a = 10
let b = 3
let minimum = min(a, b) // 3
let maximum = max(a, b) // 10

Here are some of the most commonly used functions of the String type.

String type

contains function

Checks if a string contains a specific character or substring.

Example

let string = "Hello, Swift!"
if string.contains("Swift") {
    print("Contains Swift!")
}
// Output: Contains Swift!

hasPrefix function

Checks if a string starts with a specific prefix.

Example

if string.hasPrefix("Starts") {
    print("Starts with Hello!")
}
// output: Starts with Hello!

hasSuffix function

Checks if a string ends with a specific suffix.

Example

if string.hasSuffix("!") {
    print("Ends with an exclamation mark!")
}
// Output: Ends with an exclamation mark!

lowercased function

Converts a string to all lowercase letters.

Example

let lowercasedString = string.lowercased()
print(lowercasedString)
// Output: hello, swift!

uppercased function

Converts a string to all uppercase letters.

Example

let uppercasedString = string.uppercased()
print(uppercasedString)
// Output: HELLO, SWIFT!

count function

Returns the length of a string.

Example

let length = string.count
print(length)
// Output: 13

replacingOccurences function

Replaces specific occurrences of a string with another string.

Example

let replacedString = string.replacingOccurrences(of: "Swift", with: "World")
print(replacedString)
// Output: Hello, World!