Strings

December 18, 2022

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A string literal uses double quotes " " and represents a string slice str or &str.

// String literal which is a string slice str or &str
let s1 = "hello there";

// String literal with emoji smiley face
let s2 = "hello there 😀";

Loop through the characters in a string.

let s3 = "hello";

for c in s3.chars() {
    println!("char is {c}");
}

// Prints the following:
// char is h
// char is e
// char is l
// char is l
// char is o

Get the second character in a string.

let s4 = "strawberry";
println!("second char is {}", s4.chars().nth(1).unwrap());

// Prints the following:
// second char is t

Create a String type from a string literal.

let s5 = String::from("hello again");

Create an empty String type and append to it.

let mut s6 = String::new();
s6.push_str("one");
s6.push_str("two");

println!("s6 is {s6}");

// Prints the following:
// s6 is onetwo

Use the format! macro to combine strings.

let a = String::from("tic");
let b = String::from("tac");
let c = String::from("toe");

let s = format!("{a}-{b}-{c}");

println!("s is {s}");

// Prints the following:
// s is tic-tac-toe