From b4fea634b0ab0f1149eee454eebefb9d967ee581 Mon Sep 17 00:00:00 2001
From: Stephen Chung <schungx@live.com>
Date: Sat, 7 May 2022 16:29:20 +0800
Subject: [PATCH] Avoid unnecessary allocations.

---
 src/api/json.rs              | 6 ++++--
 src/packages/string_basic.rs | 8 ++++++--
 2 files changed, 10 insertions(+), 4 deletions(-)

diff --git a/src/api/json.rs b/src/api/json.rs
index f8a8c2ce..675ae427 100644
--- a/src/api/json.rs
+++ b/src/api/json.rs
@@ -156,11 +156,13 @@ pub fn format_map_as_json(map: &Map) -> String {
     let mut result = String::from('{');
 
     for (key, value) in map {
+        use std::fmt::Write;
+
         if result.len() > 1 {
             result.push(',');
         }
 
-        result.push_str(&format!("{:?}", key));
+        write!(result, "{:?}", key).unwrap();
         result.push(':');
 
         if let Some(val) = value.read_lock::<Map>() {
@@ -171,7 +173,7 @@ pub fn format_map_as_json(map: &Map) -> String {
         if value.is::<()>() {
             result.push_str("null");
         } else {
-            result.push_str(&format!("{:?}", value));
+            write!(result, "{:?}", value).unwrap();
         }
     }
 
diff --git a/src/packages/string_basic.rs b/src/packages/string_basic.rs
index c817a24c..a64317b2 100644
--- a/src/packages/string_basic.rs
+++ b/src/packages/string_basic.rs
@@ -195,12 +195,16 @@ mod print_debug_functions {
         result.push_str("#{");
 
         map.iter_mut().enumerate().for_each(|(i, (k, v))| {
-            result.push_str(&format!(
+            use std::fmt::Write;
+
+            write!(
+                result,
                 "{:?}: {}{}",
                 k,
                 &print_with_func(FUNC_TO_DEBUG, &ctx, v),
                 if i < len - 1 { ", " } else { "" }
-            ));
+            )
+            .unwrap();
         });
 
         result.push('}');