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'TrimLeft' Has A Bug #35660

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daysleep666 opened this issue Nov 18, 2019 · 2 comments
Closed

'TrimLeft' Has A Bug #35660

daysleep666 opened this issue Nov 18, 2019 · 2 comments
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@daysleep666
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daysleep666 commented Nov 18, 2019 •
edited by ALTree

What version of Go are you using (go version)?

$ go version

go version go1.13.4 darwin/amd64

CODE

package main

import (
	"fmt"
	"strings"
)

var PrefixTagSortKey = "v1:ts:"

func main() {
	str := PrefixTagSortKey + "t"
	v := strings.TrimLeft(str, PrefixTagSortKey)
	fmt.Println(v)
}

What operating system and processor architecture are you using (go env)?

mac os

What did you do?

go run

What did you expect to see?

t

What did you see instead?

empty
@ALTree
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ALTree commented Nov 18, 2019 •
edited

Hi,

The second parameter of TrimLeft is a cutset, meaning that (from the documentation):

all leading Unicode code points contained in cutset [are] removed.

If the cutset is "v1:ts:", every single v, 1, :, t, and s character in the string will be removed.

You probably want TrimPrefix

To remove a prefix, use TrimPrefix instead.

Closing here, since this is working as intended.

@ALTree ALTree closed this as completed Nov 18, 2019
@daysleep666
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Thanks your explain.

@golang golang locked and limited conversation to collaborators Nov 17, 2020
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@ALTree @gopherbot @daysleep666