Initial data commit

Task/String-comparison/Rust/string-comparison.rust

@@ -0,0 +1,29 @@
+use std::ascii::AsciiExt; // for case insensitives only
+
+fn main() {
+    // only same types can be compared
+    // String and String or &str and &str
+    // exception: strict equality and inequality also work on &str and String
+    let a: &str = "abc";
+    let b: String = "Bac".to_owned();
+
+    // Strings are coerced to &str when borrowed and needed
+    if a == b { println!("The strings are equal") }
+    if a != b { println!("The strings are not equal") }
+    if a  > &b { println!("The first string is lexically after the second") }
+    if a  < &b { println!("The first string is lexically before the second") }
+    if a >= &b { println!("The first string is not lexically before the second") }
+    if a <= &b { println!("The first string is not lexically after the second") }
+
+    // case-insensitives:
+
+    // equality
+    // this avoids new allocations
+    if a.eq_ignore_ascii_case(&b) { println!("Both strings are equal when ignoring case") }
+
+    // everything else, create owned Strings, then compare as above
+    let a2 = a.to_ascii_uppercase();
+    let b2 = b.to_ascii_uppercase();
+
+    // repeat checks
+}