rust : wip.

dev/lang/rust/for.md

@@ -0,0 +1,10 @@
+# For loop.
+
+# Iterate.
+
+```rust
+let number = 10;
+for i in 0..number { }  // Exclusive.
+for i in 1..=number { } // Inclusive.
+for _ in 0..number { }  // Drop variable.
+```

dev/lang/rust/string.md

@@ -75,3 +75,11 @@ for c in "Зд".bytes() {}
 
 // To iterate over UTF letters you need to use an external crate.
 ```
+
+## Uppercase / Lowercase.
+
+```rust
+let s = String::from("Hi there!");
+let uppercase = s.to_uppercase();
+let lowercase = s.to_lowercase();
+```

dev/lang/rust/vector.md

@@ -33,3 +33,9 @@ You can clone a Vec in cases when you need to modify a copy.
 ```rust
 foo(vector.clone())
 ```
+
+# Push (append).
+
+```rust
+vector.push(4);
+```