Questions tagged [go]
Go is an open-source programming language. It is statically-typed, with a syntax loosely derived from C, adding automatic memory management, type safety, some dynamic typing capabilities, additional built-in types such as variable-length arrays (called slices) and key-value maps, and a large standard library.
60,343
questions
1113votes
11answers
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How to check if a map contains a key in Go?
I know I can iterate over a map m by,
for k, v := range m { ... }
and look for a key but is there a more efficient way of testing a key's existence in a map?
I couldn't find the answer in the ...
- 15.5k
867votes
19answers
567kviews
How to efficiently concatenate strings in go
In Go, a string is a primitive type, which means it is read-only, and every manipulation of it will create a new string.
So if I want to concatenate strings many times without knowing the length of ...
- 67.9k
762votes
11answers
339kviews
How do you write multiline strings in Go?
Does Go have anything similar to Python's multiline strings:
"""line 1
line 2
line 3"""
If not, what is the preferred way of writing strings spanning multiple lines?
- 10.6k
687votes
8answers
439kviews
Concatenate two slices in Go
I'm trying to combine the slice [1, 2] and the slice [3, 4]. How can I do this in Go?
I tried:
append([]int{1,2}, []int{3,4})
but got:
cannot use []int literal (type []int) as type int in append
...
- 54.5k
678votes
8answers
481kviews
Is there a foreach loop in Go?
Is there a foreach construct in the Go language? Can I iterate over a slice or array using a for?
- 23.8k
660votes
12answers
432kviews
What is an idiomatic way of representing enums in Go?
I'm trying to represent a simplified chromosome, which consists of N bases, each of which can only be one of {A, C, T, G}.
I'd like to formalize the constraints with an enum, but I'm wondering what ...
- 7,761
650votes
10answers
536kviews
How to convert an int value to string in Go?
i := 123
s := string(i)
s is 'E', but what I want is "123"
Please tell me how can I get "123".
And in Java, I can do in this way:
String s = "ab" + "c" // s is "abc"
how can I concat two ...
- 16.3k
628votes
15answers
368kviews
Optional Parameters in Go?
Can Go have optional parameters? Or can I just define two functions with the same name and a different number of arguments?
- 14.9k
570votes
26answers
497kviews
How to print struct variables in console?
How can I print (to the console) the Id, Title, Name, etc. of this struct in Golang?
type Project struct {
Id int64 `json:"project_id"`
Title string `json:"title"`...
- 7,395
565votes
13answers
365kviews
How to check if a file exists in Go?
Go's standard library does not have a function solely intended to check if a file exists or not (like Python's os.path.exists). What is the idiomatic way to do it?
- 74.4k
538votes
11answers
503kviews
How can I convert a zero-terminated byte array to string?
I need to read [100]byte to transfer a bunch of string data.
Because not all of the strings are precisely 100 characters long, the remaining part of the byte array is padded with 0s.
If I convert [100]...
- 20.3k
520votes
3answers
125kviews
What are the use(s) for tags in Go?
In the Go Language Specification, it mentions a brief overview of tags:
A field declaration may be followed by an optional string literal tag,
which becomes an attribute for all the fields in ...
- 13k
490votes
16answers
488kviews
How to find the type of an object in Go?
How do I find the type of an object in Go? In Python, I just use typeof to fetch the type of object. Similarly in Go, is there a way to implement the same ?
Here is the container from which I am ...
- 10.2k
484votes
9answers
504kviews
How to assign string to bytes array
I want to assign string to bytes array:
var arr [20]byte
str := "abc"
for k, v := range []byte(str) {
arr[k] = byte(v)
}
Have another method?
- 4,957
482votes
9answers
296kviews
Format a Go string without printing?
Is there a simple way to format a string in Go without printing the string?
I can do:
bar := "bar"
fmt.Printf("foo: %s", bar)
But I want the formatted string returned rather than printed so I can ...
- 4,955
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