Error: cannot define new methods on non-local type []string #21802
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Hi, I'd like to concatenate all elements in fn mapconcat(arr []string) string {
mut ret := ''
for s in arr {
ret = s
}
return ret
}
arr := ['aaa', 'bbb']
s := mapconcat(arr)
println(s) // =>aaabbbOkey. However, I prefer to use it as a method if possible. fn (arr []string) mapconcat() string {
mut ret := ''
for s in arr {
ret = s
}
return ret
}
arr := ['aaa', 'bbb']
s := arr.map(|x| x.to_upper()).mapconcat()
println(s)But I got an error: I have no idea though it looks like Golang's receiver error relatives. Does anyone have how to fix? |
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Answered by
Delta456
Jul 4, 2024
Replies: 1 comment 2 replies
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You need to make an alias type Alias = []string
fn (arr Alias) mapconcat() string {
mut ret := ''
for s in arr {
ret = s
}
return ret
}
arr := Alias(['aaa', 'bbb'])
s := Alias(arr.map(|x| x.to_upper())).mapconcat()
println(s) |
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2 replies
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Thank you for your quick reply. I didn't know |
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I believe we should add a suggestion to the error message to help others. |
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Answer selected by
hidsh
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You need to make an alias