added files

Author: hitesh-bhatnagar

examples/08_hashmap_part_2.rs

@@ -1 +1,3 @@
-fn main() {}
+fn main() {
+    
+}

examples/09_strings.rs

@@ -0,0 +1,87 @@
+fn main(){
+
+	// PART 1: &str vs String
+
+	// &str --> fized text baked into your program
+	let fixed: &str = "hello world";
+	println!("&str: {}", fixed);
+
+	// String --> owned, growable txt
+	let owned: String = String::from("hello world");
+	println!("String: {}", owned);
+
+	// convert &str --> String
+	let s1 = "help".to_string();
+	let s2 = String::from("me please");
+	println!("both equal: {}", s1 == s2);	// true
+
+	// convert String --> &str
+	let owned = String::from("hello");
+	let borrowed : &str = &owned;		// borrow it as &str
+	prontln!("borrowed: {}", borrowed);
+
+	// PART 2: Building Strings
+
+	// push_str --> appedn a &str
+	let mut s =String::from("hello");
+	s.push_str(" Universe");
+	println!("{} ", s);
+
+	// push --> append a single character
+	s.push('!');
+	println!("{}", S);
+
+	// + operator --> concatenates
+	// NOTE: Consumes first string!!
+	let s1 = String::from("Is this a real life ");
+	let s2 = String::from("or just fantasy ");
+	
+	let s3 = s1+s2;		// s1 is MOVED here --> can't use s1 after this
+
+	println!("{}", s3);
+
+	// format! macro --> joins w/o consuming (most flexible)
+	let first = String::from("Caught in a landscape, ");
+	let sec = String::from("no escape from reality");
+	let combined = format!("{} {}!", first, second);
+
+	println!("{}", combined);		//NOTE: first & sec are still valid -- format! borrows them
+
+	// repeat
+	let repeated = "ha".repeat(3);
+	println!("{}", repeated);
+
+	// PART 3: Trimming
+	let s = "		Namaste India		";
+
+	println!("'{}'", s.trim());		// 'Namaste India'
+	println!("'{}'", s.trim_start());
+	println!("'{}'", s.trim_end());
+
+	// trim specific characters
+    let s2 = "###hello###";
+    println!("{}", s2.trim_matches('#')); 
+
+    // PART 4: Searching & Checking
+
+    let s = String::from("hello, rust world!!");
+
+    println!("contains 'Rust': {}", s.contains("Rust"));
+    println!("starts_with 'Hello': {}", s.starts_with("Hello"));
+    println!("ends_with 'World!': {}", s.ends_with("World!"));
+    println!("is it empty? : {}", s.is_empty());
+
+    // find --> returns the index of first match, or None
+    match s.find("Rust") {
+    	Some(i) => println!("'Rust' found at index {}", i);
+    	None => println!("not found");
+    }
+
+    // PART 5 : Replacing
+
+    let s = String::from("I love Java and Java was my first programming language");
+	
+    // replace --> replaces ALL occurences
+	
+		
+}