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perf: pre-allocate all known length arrays to avoid re-scaling (#5029)
Co-authored-by: Kevin Wan <wanjunfeng@gmail.com>
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@@ -90,7 +90,7 @@ func ToUpperCase(r rune) rune {
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// ToLower returns a copy string by converting it into lower
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func ToLower(s string) string {
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var out []rune
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out := make([]rune, 0, len(s))
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for _, r := range s {
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out = append(out, ToLowerCase(r))
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}
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@@ -99,7 +99,7 @@ func ToLower(s string) string {
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// ToUpper returns a copy string by converting it into upper
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func ToUpper(s string) string {
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var out []rune
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out := make([]rune, 0, len(s))
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for _, r := range s {
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out = append(out, ToUpperCase(r))
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}
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