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Use HashMap::from() instead of using HashMap::new() with HashMap::insert()

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This commit is contained in:
Joseph T Lyons 2021-12-02 12:26:47 -05:00
parent 18bb8c61a9
commit 80a308df32
1 changed files with 70 additions and 53 deletions
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123
library/std/src/collections/hash/map.rs
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@ -334,10 +334,11 @@ impl<K, V, S> HashMap<K, V, S> {
/// ``` /// ```
/// use std::collections::HashMap; /// use std::collections::HashMap;
/// ///
/// let mut map = HashMap::new(); /// let map = HashMap::from([
/// map.insert("a", 1); /// ("a", 1),
/// map.insert("b", 2); /// ("b", 2),
/// map.insert("c", 3); /// ("c", 3),
/// ]);
/// ///
/// for key in map.keys() { /// for key in map.keys() {
/// println!("{}", key); /// println!("{}", key);
@ -356,10 +357,11 @@ impl<K, V, S> HashMap<K, V, S> {
/// ``` /// ```
/// use std::collections::HashMap; /// use std::collections::HashMap;
/// ///
/// let mut map = HashMap::new(); /// let map = HashMap::from([
/// map.insert("a", 1); /// ("a", 1),
/// map.insert("b", 2); /// ("b", 2),
/// map.insert("c", 3); /// ("c", 3),
/// ]);
/// ///
/// for val in map.values() { /// for val in map.values() {
/// println!("{}", val); /// println!("{}", val);
@ -378,11 +380,11 @@ impl<K, V, S> HashMap<K, V, S> {
/// ``` /// ```
/// use std::collections::HashMap; /// use std::collections::HashMap;
/// ///
/// let mut map = HashMap::new(); /// let map = HashMap::from([
/// /// ("a", 1),
/// map.insert("a", 1); /// ("b", 2),
/// map.insert("b", 2); /// ("c", 3),
/// map.insert("c", 3); /// ]);
/// ///
/// for val in map.values_mut() { /// for val in map.values_mut() {
/// *val = *val + 10; /// *val = *val + 10;
@ -405,10 +407,11 @@ impl<K, V, S> HashMap<K, V, S> {
/// ``` /// ```
/// use std::collections::HashMap; /// use std::collections::HashMap;
/// ///
/// let mut map = HashMap::new(); /// let map = HashMap::from([
/// map.insert("a", 1); /// ("a", 1),
/// map.insert("b", 2); /// ("b", 2),
/// map.insert("c", 3); /// ("c", 3),
/// ]);
/// ///
/// for (key, val) in map.iter() { /// for (key, val) in map.iter() {
/// println!("key: {} val: {}", key, val); /// println!("key: {} val: {}", key, val);
@ -428,10 +431,11 @@ impl<K, V, S> HashMap<K, V, S> {
/// ``` /// ```
/// use std::collections::HashMap; /// use std::collections::HashMap;
/// ///
/// let mut map = HashMap::new(); /// let map = HashMap::from([
/// map.insert("a", 1); /// ("a", 1),
/// map.insert("b", 2); /// ("b", 2),
/// map.insert("c", 3); /// ("c", 3),
/// ]);
/// ///
/// // Update all values /// // Update all values
/// for (_, val) in map.iter_mut() { /// for (_, val) in map.iter_mut() {
@ -966,10 +970,11 @@ where
/// ``` /// ```
/// use std::collections::HashMap; /// use std::collections::HashMap;
/// ///
/// let mut map = HashMap::new(); /// let map = HashMap::from([
/// map.insert("a", 1); /// ("a", 1),
/// map.insert("b", 2); /// ("b", 2),
/// map.insert("c", 3); /// ("c", 3),
/// ]);
/// ///
/// let mut vec: Vec<&str> = map.into_keys().collect(); /// let mut vec: Vec<&str> = map.into_keys().collect();
/// // The `IntoKeys` iterator produces keys in arbitrary order, so the /// // The `IntoKeys` iterator produces keys in arbitrary order, so the
@ -992,10 +997,11 @@ where
/// ``` /// ```
/// use std::collections::HashMap; /// use std::collections::HashMap;
/// ///
/// let mut map = HashMap::new(); /// let map = HashMap::from([
/// map.insert("a", 1); /// ("a", 1),
/// map.insert("b", 2); /// ("b", 2),
/// map.insert("c", 3); /// ("c", 3),
/// ]);
/// ///
/// let mut vec: Vec<i32> = map.into_values().collect(); /// let mut vec: Vec<i32> = map.into_values().collect();
/// // The `IntoValues` iterator produces values in arbitrary order, so /// // The `IntoValues` iterator produces values in arbitrary order, so
@ -1202,8 +1208,9 @@ where
/// ``` /// ```
/// use std::collections::HashMap; /// use std::collections::HashMap;
/// ///
/// let mut map = HashMap::new(); /// let map = HashMap::from([
/// map.insert("a", 1); /// ("a", 1),
/// ]);
/// let iter = map.iter(); /// let iter = map.iter();
/// ``` /// ```
#[stable(feature = "rust1", since = "1.0.0")] #[stable(feature = "rust1", since = "1.0.0")]
@ -1239,8 +1246,9 @@ impl<K: Debug, V: Debug> fmt::Debug for Iter<'_, K, V> {
/// ``` /// ```
/// use std::collections::HashMap; /// use std::collections::HashMap;
/// ///
/// let mut map = HashMap::new(); /// let map = HashMap::from([
/// map.insert("a", 1); /// ("a", 1),
/// ]);
/// let iter = map.iter_mut(); /// let iter = map.iter_mut();
/// ``` /// ```
#[stable(feature = "rust1", since = "1.0.0")] #[stable(feature = "rust1", since = "1.0.0")]
@ -1269,8 +1277,9 @@ impl<'a, K, V> IterMut<'a, K, V> {
/// ``` /// ```
/// use std::collections::HashMap; /// use std::collections::HashMap;
/// ///
/// let mut map = HashMap::new(); /// let map = HashMap::from([
/// map.insert("a", 1); /// ("a", 1),
/// ]);
/// let iter = map.into_iter(); /// let iter = map.into_iter();
/// ``` /// ```
#[stable(feature = "rust1", since = "1.0.0")] #[stable(feature = "rust1", since = "1.0.0")]
@ -1298,8 +1307,9 @@ impl<K, V> IntoIter<K, V> {
/// ``` /// ```
/// use std::collections::HashMap; /// use std::collections::HashMap;
/// ///
/// let mut map = HashMap::new(); /// let map = HashMap::from([
/// map.insert("a", 1); /// ("a", 1),
/// ]);
/// let iter_keys = map.keys(); /// let iter_keys = map.keys();
/// ``` /// ```
#[stable(feature = "rust1", since = "1.0.0")] #[stable(feature = "rust1", since = "1.0.0")]
@ -1335,8 +1345,9 @@ impl<K: Debug, V> fmt::Debug for Keys<'_, K, V> {
/// ``` /// ```
/// use std::collections::HashMap; /// use std::collections::HashMap;
/// ///
/// let mut map = HashMap::new(); /// let map = HashMap::from([
/// map.insert("a", 1); /// ("a", 1),
/// ]);
/// let iter_values = map.values(); /// let iter_values = map.values();
/// ``` /// ```
#[stable(feature = "rust1", since = "1.0.0")] #[stable(feature = "rust1", since = "1.0.0")]
@ -1372,8 +1383,9 @@ impl<K, V: Debug> fmt::Debug for Values<'_, K, V> {
/// ``` /// ```
/// use std::collections::HashMap; /// use std::collections::HashMap;
/// ///
/// let mut map = HashMap::new(); /// let map = HashMap::from([
/// map.insert("a", 1); /// ("a", 1),
/// ]);
/// let iter = map.drain(); /// let iter = map.drain();
/// ``` /// ```
#[stable(feature = "drain", since = "1.6.0")] #[stable(feature = "drain", since = "1.6.0")]
@ -1402,8 +1414,9 @@ impl<'a, K, V> Drain<'a, K, V> {
/// ///
/// use std::collections::HashMap; /// use std::collections::HashMap;
/// ///
/// let mut map = HashMap::new(); /// let map = HashMap::from([
/// map.insert("a", 1); /// ("a", 1),
/// ]);
/// let iter = map.drain_filter(|_k, v| *v % 2 == 0); /// let iter = map.drain_filter(|_k, v| *v % 2 == 0);
/// ``` /// ```
#[unstable(feature = "hash_drain_filter", issue = "59618")] #[unstable(feature = "hash_drain_filter", issue = "59618")]
@ -1426,8 +1439,9 @@ where
/// ``` /// ```
/// use std::collections::HashMap; /// use std::collections::HashMap;
/// ///
/// let mut map = HashMap::new(); /// let map = HashMap::from([
/// map.insert("a", 1); /// ("a", 1),
/// ]);
/// let iter_values = map.values_mut(); /// let iter_values = map.values_mut();
/// ``` /// ```
#[stable(feature = "map_values_mut", since = "1.10.0")] #[stable(feature = "map_values_mut", since = "1.10.0")]
@ -1447,8 +1461,9 @@ pub struct ValuesMut<'a, K: 'a, V: 'a> {
/// ``` /// ```
/// use std::collections::HashMap; /// use std::collections::HashMap;
/// ///
/// let mut map = HashMap::new(); /// let map = HashMap::from([
/// map.insert("a", 1); /// ("a", 1),
/// ]);
/// let iter_keys = map.into_keys(); /// let iter_keys = map.into_keys();
/// ``` /// ```
#[stable(feature = "map_into_keys_values", since = "1.54.0")] #[stable(feature = "map_into_keys_values", since = "1.54.0")]
@ -1468,8 +1483,9 @@ pub struct IntoKeys<K, V> {
/// ``` /// ```
/// use std::collections::HashMap; /// use std::collections::HashMap;
/// ///
/// let mut map = HashMap::new(); /// let map = HashMap::from([
/// map.insert("a", 1); /// ("a", 1),
/// ]);
/// let iter_keys = map.into_values(); /// let iter_keys = map.into_values();
/// ``` /// ```
#[stable(feature = "map_into_keys_values", since = "1.54.0")] #[stable(feature = "map_into_keys_values", since = "1.54.0")]
@ -2004,10 +2020,11 @@ impl<K, V, S> IntoIterator for HashMap<K, V, S> {
/// ``` /// ```
/// use std::collections::HashMap; /// use std::collections::HashMap;
/// ///
/// let mut map = HashMap::new(); /// let map = HashMap::from([
/// map.insert("a", 1); /// ("a", 1),
/// map.insert("b", 2); /// ("b", 2),
/// map.insert("c", 3); /// ("c", 3),
/// ]);
/// ///
/// // Not possible with .iter() /// // Not possible with .iter()
/// let vec: Vec<(&str, i32)> = map.into_iter().collect(); /// let vec: Vec<(&str, i32)> = map.into_iter().collect();