如何依次遍历golang中的地图? [英] How to iterate through a map in golang in order?
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问题描述
请参阅下面的地图
var romanNumeralDict map [int] string = map [int] string {
1000:M,
900:CM,
500:D,
400:CD,
100:C,
90:XC,
50:L,
40:XL,
10:X,
9:IX,
5:V,
4:IV,
1:I,
}
我正在按照键大小的顺序循环显示这张地图
for k,v:= range romanNumeralDict {
pre>
fmt.Println(k:,k,v:,v)
}
然而,这会打印出来
k:1000 v: M
k:40 v:XL
k:5 v:V
k:4 v:IV
k:900 v:CM
k:500 v:D
k :400 v:CD
k:100 v:C
k:90 v:XC
k:50 v:L
k:10 v:X
k:9 v:IX
k:1 v:I
有没有办法可以将它们打印出来关键的大小顺序如此,我会李可以像这样循环浏览这张地图
k:1
K:4
K:5
K:9
k:10
等...
非常感谢您的帮助!
解决方案收集所有密钥,对它们进行排序并按键重复你的map,如下所示:
$ $ $ $ $ $ $ $ $ $ $ $ $ $ $ k,_:=范围romanNumeralDict {
keys = append(keys,k)
}
sort.Ints(keys)
for _,k:=范围键{
fmt.Println(k,romanNumeralDict [k])
}
Please see below my map
var romanNumeralDict map[int]string = map[int]string{
1000: "M",
900 : "CM",
500 : "D",
400 : "CD",
100 : "C",
90 : "XC",
50 : "L",
40 : "XL",
10 : "X",
9 : "IX",
5 : "V",
4 : "IV",
1 : "I",
}
I am looking to loop through this map in the order of the size of the key
for k, v := range romanNumeralDict {
fmt.Println("k:", k, "v:", v)
}
However, this prints out
k: 1000 v: M
k: 40 v: XL
k: 5 v: V
k: 4 v: IV
k: 900 v: CM
k: 500 v: D
k: 400 v: CD
k: 100 v: C
k: 90 v: XC
k: 50 v: L
k: 10 v: X
k: 9 v: IX
k: 1 v: I
Is there a way that I can print them out in the order of the size of the key so, I would like to loop through this map like this
k:1
K:4
K:5
K:9
k:10
etc...
Thank you very much for your help!
解决方案
Collect all keys, sort them and iterate your map by key, like the following:
keys := make([]int, 0)
for k, _ := range romanNumeralDict {
keys = append(keys, k)
}
sort.Ints(keys)
for _, k := range keys {
fmt.Println(k, romanNumeralDict[k])
}
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