str sample - rust

sample.rs

// str - Rust https://doc.rust-lang.org/std/primitive.str.html
fn main() {
    test_str();
    test_str_contains();
    test_str_find();
    test_str_splitn();
}

fn test_str() {
    assert_eq!("abc".len(), 3);

    assert_eq!("aaa" == "aaa", true);
    assert_eq!("bbb".eq("bbb"), true);
    assert_eq!("bbb".ne("ccc"), true);
}

// str - Rust https://doc.rust-lang.org/std/primitive.str.html#method.contains
fn test_str_contains() {
    let s = "Monday";

    assert_eq!(s.contains("Mon"), true);
    assert_eq!(s.contains("mon"), false);
}

// str - Rust https://doc.rust-lang.org/std/primitive.str.html#method.find
fn test_str_find() {
    let s = "Monday";

    assert_eq!(s.find("m"), None);
    assert_eq!(s.find('o'), Some(1));
    assert_eq!(s.find("day"), Some(3));
}

// str - Rust https://doc.rust-lang.org/std/primitive.str.html#method.splitn
fn test_str_splitn() {
    let v: Vec<&str> = "This is my pen".splitn(3, ' ').collect();
    assert_eq!(v, ["This", "is", "my pen"]);
}