19 lines
298 B
Go
19 lines
298 B
Go
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package main
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import (
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"fmt"
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"strings"
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)
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func concat(x, y string) string {
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var builder strings.Builder
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builder.Grow(len(x) + len(y)) // only this line allocates
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builder.WriteString(x)
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builder.WriteString(y)
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return builder.String()
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}
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func main() {
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fmt.Println(concat("hello ", "world"))
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}
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