From b2ac227e4c4af8ba101dcd43736e35b4f4893509 Mon Sep 17 00:00:00 2001
From: Hatter Jiang <jht5945@gmail.com>
Date: Sun, 3 May 2020 01:00:39 +0800
Subject: [PATCH] add to map

---
 single_file_tests/vec.rs | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/single_file_tests/vec.rs b/single_file_tests/vec.rs
index 7a825f6..11e5a14 100644
--- a/single_file_tests/vec.rs
+++ b/single_file_tests/vec.rs
@@ -1,3 +1,4 @@
+use std::collections::BTreeMap;
 
 fn main() {
     let v = vec![1, 3, 5];
@@ -21,5 +22,10 @@ fn main() {
     let v3: Vec<i32> = (0..3).collect();
     let v4 = v3.iter().map(|&x| x * 2).collect::<Vec<_>>();
     println!("{:?} -> {:?}", v3, v4);
+
+    println!("To Map:");
+    let v = (0..5).collect::<Vec<i32>>();
+    let m = v.iter().map(|i| (*i, i * 10)).collect::<BTreeMap<i32, i32>>();
+    println!("{:?}", m);
 }