maps

原文：https://pkg.go.dev/maps@go1.23.0

注意

​ 从go1.21.0开始才有该包。

概述

Package maps defines various functions useful with maps of any type.

​ maps包定义了各种类型映射的有用函数。

常量

This section is empty.

变量

This section is empty.

函数

func All <- go1.23.0

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func All[Map ~map[K]V, K comparable, V any](m Map) iter.Seq2[K, V]

All returns an iterator over key-value pairs from m. The iteration order is not specified and is not guaranteed to be the same from one call to the next.

​ All 返回一个迭代器，用于遍历 m 中的键值对。迭代顺序未指定，并且从一次调用到下一次调用可能不相同。

func Clone

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func Clone[M ~map[K]V, K comparable, V any](m M) M

Clone returns a copy of m. This is a shallow clone: the new keys and values are set using ordinary assignment.

​ Clone返回m的副本。这是一个浅拷贝：新键和值使用普通赋值设置。

func Collect <- go1.23.0

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func Collect[K comparable, V any](seq iter.Seq2[K, V]) map[K]V

Collect collects key-value pairs from seq into a new map and returns it.

​ Collect 将 seq 中的键值对收集到一个新的 map 中并返回。

func Copy

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func Copy[M1 ~map[K]V, M2 ~map[K]V, K comparable, V any](dst M1, src M2)

Copy copies all key/value pairs in src adding them to dst. When a key in src is already present in dst, the value in dst will be overwritten by the value associated with the key in src.

​ Copy函数将src中的所有键/值对复制到dst中。当src中的某个键已经存在于dst中时，dst中的值将被src中与该键关联的值覆盖。

func DeleteFunc

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func DeleteFunc[M ~map[K]V, K comparable, V any](m M, del func(K, V) bool)

DeleteFunc deletes any key/value pairs from m for which del returns true.

​ DeleteFunc函数从m中删除del返回true的任何键/值对。

DeleteFunc Example

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package main

import (
	"fmt"
	"maps"
)

func main() {
	m := map[string]int{
		"one":   1,
		"two":   2,
		"three": 3,
		"four":  4,
	}
	maps.DeleteFunc(m, func(k string, v int) bool {
		return v%2 != 0 // delete odd values
	})
	fmt.Println(m)
}
Output:

map[four:4 two:2]

func Equal

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func Equal[M1, M2 ~map[K]V, K, V comparable](m1 M1, m2 M2) bool

Equal reports whether two maps contain the same key/value pairs. Values are compared using ==.

​ Equal函数报告两个映射是否包含相同的键/值对。值使用==进行比较。

func EqualFunc

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func EqualFunc[M1 ~map[K]V1, M2 ~map[K]V2, K comparable, V1, V2 any](m1 M1, m2 M2, eq func(V1, V2) bool) bool

EqualFunc is like Equal, but compares values using eq. Keys are still compared with ==.

​ EqualFunc函数类似于Equal函数，但使用eq比较值。键仍然使用==进行比较。

EqualFunc Example

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package main

import (
	"fmt"
	"maps"
	"strings"
)

func main() {
	m1 := map[int]string{
		1:    "one",
		10:   "Ten",
		1000: "THOUSAND",
	}
	m2 := map[int][]byte{
		1:    []byte("One"),
		10:   []byte("Ten"),
		1000: []byte("Thousand"),
	}
	eq := maps.EqualFunc(m1, m2, func(v1 string, v2 []byte) bool {
		return strings.ToLower(v1) == strings.ToLower(string(v2))
	})
	fmt.Println(eq)
}
Output:

true

func Insert <- go1.23.0

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func Insert[Map ~map[K]V, K comparable, V any](m Map, seq iter.Seq2[K, V])

Insert adds the key-value pairs from seq to m. If a key in seq already exists in m, its value will be overwritten.

​ Insert 将 seq 中的键值对添加到 m 中。如果 seq 中的键已经存在于 m 中，则其值会被覆盖。

func Keys <- go1.23.0

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func Keys[Map ~map[K]V, K comparable, V any](m Map) iter.Seq[K]

Keys returns an iterator over keys in m. The iteration order is not specified and is not guaranteed to be the same from one call to the next.

​ Keys 返回一个迭代器，用于遍历 m 中的键。迭代顺序未指定，并且从一次调用到下一次调用可能不相同。

func Values <- go1.23.0

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func Values[Map ~map[K]V, K comparable, V any](m Map) iter.Seq[V]

Values returns an iterator over values in m. The iteration order is not specified and is not guaranteed to be the same from one call to the next.

​ Values 返回一个迭代器，用于遍历 m 中的值。迭代顺序未指定，并且从一次调用到下一次调用可能不相同。

类型

This section is empty.