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