Fixes rands

src/algorithms/randomness/rand-choose.md

@@ -7,14 +7,14 @@ user-defined bytestring, with [`gen_range`].
 
 ```rust
 extern crate rand;
+use rand::{Rng, thread_rng};
 
 fn main() {
-    use rand::Rng;
     const CHARSET: &[u8] = b"ABCDEFGHIJKLMNOPQRSTUVWXYZ\
                             abcdefghijklmnopqrstuvwxyz\
                             0123456789)(*&^%$#@!~";
     const PASSWORD_LEN: usize = 30;
-    let mut rng = rand::thread_rng();
+    let mut rng = thread_rng();
 
     let password: String = (0..PASSWORD_LEN)
         .map(|_| {

src/algorithms/randomness/rand-custom.md

@@ -8,7 +8,7 @@ Implements the [`Distribution`] trait on type Point for [`Standard`] in order to
 ```rust
 extern crate rand;
 
-use rand::Rng;
+use rand::{Rng, thread_rng};
 use rand::distributions::{Distribution, Standard};
 
 #[derive(Debug)]
@@ -28,7 +28,7 @@ impl Distribution<Point> for Standard {
 }
 
 fn main() {
-    let mut rng = rand::thread_rng();
+    let mut rng = thread_rng();
     let rand_tuple = rng.gen::<(i32, bool, f64)>();
     let rand_point: Point = rng.gen();
     println!("Random tuple: {:?}", rand_tuple);

src/algorithms/randomness/rand-dist.md

@@ -13,11 +13,11 @@ The [distributions available are documented here][rand-distributions]. An exampl
 
 ```rust
 extern crate rand;
-
+use rand::{Rng, thread_rng};
 use rand::distributions::{Normal, Distribution};
 
 fn main() {
-  let mut rng = rand::thread_rng();
+  let mut rng = thread_rng();
   let normal = Normal::new(2.0, 3.0);
   let v = normal.sample(&mut rng);
   println!("{} is from a N(2, 9) distribution", v)

src/algorithms/randomness/rand-passwd.md

@@ -8,7 +8,7 @@ a-z, 0-9`, with [`Alphanumeric`] sample.
 ```rust
 extern crate rand;
 
-use rand::{thread_rng, Rng};
+use rand::{Rng, thread_rng};
 use rand::distributions::Alphanumeric;
 
 fn main() {

src/algorithms/randomness/rand-range.md

@@ -6,11 +6,10 @@ Generates a random value within half-open `[0, 10)` range (not including `10`) w
 
 ```rust
 extern crate rand;
-
-use rand::Rng;
+use rand::{Rng, thread_rng};
 
 fn main() {
-    let mut rng = rand::thread_rng();
+    let mut rng = thread_rng();
     println!("Integer: {}", rng.gen_range(0, 10));
     println!("Float: {}", rng.gen_range(0.0, 10.0));
 }

src/algorithms/randomness/rand.md

@@ -10,11 +10,10 @@ including 1.
 
 ```rust
 extern crate rand;
-
-use rand::Rng;
+use rand::{Rng, thread_rng};
 
 fn main() {
-    let mut rng = rand::thread_rng();
+    let mut rng = thread_rng();
 
     let n1: u8 = rng.gen();
     let n2: u16 = rng.gen();

src/concurrency/parallel/rayon-parallel-sort.md

@@ -21,7 +21,7 @@ fn main() {
   let mut vec = vec![String::new(); 100_000];
   vec.par_iter_mut().for_each(|p| {
     let mut rng = thread_rng();
-    *p = (0..5).map(|_| rng.sample(&Alphanumeric)).collect()
+    *p = rng.sample_iter(&Alphanumeric).take(5).collect()
   });
   vec.par_sort_unstable();
 }