Iterating over go string and making string from chars in go

Question

I started learning go and I want to implement some algorithm. I can iterate over strings and then get chars, but these chars are Unicode numbers.

How to concatenate chars into strings in go? Do you have some reference? I was unable to find anything about primitives in official page.

well what the hell is a "char"? There is no such type in Go – newacct Jun 26 '13 at 22:09 — newacct, Jun 26 '13 at 22:09

score 9 · Accepted Answer · edited Jun 26 '13 at 08:53

Iterating over strings using range gives you Unicode characters while iterating over a string using an index gives you bytes. See the spec for runes and strings as well as their conversions.

As The New Idiot mentioned, strings can be concatenated using the + operator.

The conversion from character to string is two-fold. You can convert a byte (or byte sequence) to a string:

string(byte('A'))

or you can convert a rune (or rune sequence) to a string:

string(rune('µ'))

The difference is that runes represent Unicode characters while bytes represent 8 bit values.

But all of this is mentioned in the respective sections of the spec I linked above. It's quite easy to understand, you should definitely read it.

Thank you for explaining difference between iterating with index and `range` — Sławosz, Jun 26 '13 at 08:22

score 3 · Answer 2 · answered Jun 26 '13 at 15:01

you can convert a []rune to a string directly:

string([]rune{'h', 'e', 'l', 'l', 'o', '☃'})

http://play.golang.org/p/P9vKXlo47c

as for reference, it's in the Conversions section of the Go spec, in the section titled "Conversions to and from a string type"

http://golang.org/ref/spec#Conversions

as for concatenation, you probably don't want to concatenate every single character with the + operator, since that will perform a lot of copying under the hood. If you're getting runes in one at a time and you're not building an intermediate slice of runes, you most likely want to use a bytes.Buffer, which has a WriteRune method for this sort of thing. http://golang.org/pkg/bytes/#Buffer.WriteRune

score 2 · Answer 3 · edited May 23 '17 at 12:15

2

Use +

str:= str + "a"

You can try something like this :

string1 := "abc"
character1 := byte('A')
string1 += string(character1)

Even this answer might be of help.

edited May 23 '17 at 12:15

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answered Jun 26 '13 at 07:55

AllTooSir

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score 0 · Answer 4 · answered Jan 31 '19 at 00:28

definetly worth reading @nemo's post

Iterating over strings using range gives you Unicode characters while iterating over a string using an index gives you bytes. See the spec for runes and strings as well as their conversions.

Strings can be concatenated using the + operator.

The conversion from character to string is two-fold. You can convert a byte (or byte sequence) to a string:

string(byte('A'))

or you can convert a rune (or rune sequence) to a string:

string(rune('µ'))

Iterating over go string and making string from chars in go

4 Answers4