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cast

(★ 3,981)

safe and easy casting from one type to another in Go

파일 탐색기

최종 버전 다운로드 (.zip)

# 설치 가이드

1. 코드 내려받기

git clone https://github.com/spf13/cast

깃허브에서 프로젝트 코드 전체를 내 컴퓨터로 내려받습니다.

cd cast

방금 내려받은 프로젝트 폴더 안으로 이동합니다.

2. Go

보통 추천

사전 준비물

Git GitHub에서 프로젝트 코드를 내려받으려면 필요합니다.
Go Go 언어 컴파일러 및 도구 모음입니다.

cd generator

이 프로젝트의 관련 파일이 하위 폴더 안에 있어서, 먼저 그 폴더로 이동합니다.

go build ./...

Go 프로그램을 컴파일해 실행 파일을 만듭니다.

go run .

따로 빌드하지 않고 바로 Go 프로그램을 실행합니다.

✅ 빌드가 에러 없이 끝나면 성공입니다. go run . 을 썼다면 터미널 출력을 확인하세요.

// repository documentation

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# cast

[![GitHub Workflow Status](https://img.shields.io/github/actions/workflow/status/spf13/cast/ci.yaml?style=flat-square)](https://github.com/spf13/cast/actions/workflows/ci.yaml)
[![go.dev reference](https://img.shields.io/badge/go.dev-reference-007d9c?logo=go&logoColor=white&style=flat-square)](https://pkg.go.dev/mod/github.com/spf13/cast)
![GitHub go.mod Go version](https://img.shields.io/github/go-mod/go-version/spf13/cast?style=flat-square&color=61CFDD)
[![OpenSSF Scorecard](https://api.securityscorecards.dev/projects/github.com/spf13/cast/badge?style=flat-square)](https://deps.dev/go/github.com%252Fspf13%252Fcast)

Easy and safe casting from one type to another in Go

Don’t Panic! ... Cast

## What is Cast?

Cast is a library to convert between different go types in a consistent and easy way.

Cast provides simple functions to easily convert a number to a string, an
interface into a bool, etc. Cast does this intelligently when an obvious
conversion is possible. It doesn’t make any attempts to guess what you meant,
for example you can only convert a string to an int when it is a string
representation of an int such as “8”. Cast was developed for use in
[Hugo](https://gohugo.io), a website engine which uses YAML, TOML or JSON
for meta data.

## Why use Cast?

When working with dynamic data in Go you often need to cast or convert the data
from one type into another. Cast goes beyond just using type assertion (though
it uses that when possible) to provide a very straightforward and convenient
library.

If you are working with interfaces to handle things like dynamic content
you’ll need an easy way to convert an interface into a given type. This
is the library for you.

If you are taking in data from YAML, TOML or JSON or other formats which lack
full types, then Cast is the library for you.

## Usage

Cast provides a handful of To_____ methods. These methods will always return
the desired type. **If input is provided that will not convert to that type, the
0 or nil value for that type will be returned**.

Cast also provides identical methods To_____E. These return the same result as
the To_____ methods, plus an additional error which tells you if it successfully
converted. Using these methods you can tell the difference between when the
input matched the zero value or when the conversion failed and the zero value
was returned.

The following examples are merely a sample of what is available. Please review
the code for a complete set.

### Example ‘ToString’:

cast.ToString("mayonegg")         // "mayonegg"
    cast.ToString(8)                  // "8"
    cast.ToString(8.31)               // "8.31"
    cast.ToString([]byte("one time")) // "one time"
    cast.ToString(nil)                // ""

var foo interface{} = "one more time"
    cast.ToString(foo)                // "one more time"

### Example ‘ToInt’:

cast.ToInt(8)                  // 8
    cast.ToInt(8.31)               // 8
    cast.ToInt("8")                // 8
    cast.ToInt(true)               // 1
    cast.ToInt(false)              // 0

var eight interface{} = 8
    cast.ToInt(eight)              // 8
    cast.ToInt(nil)                // 0

## Development

The project uses [just](https://just.systems/) to run development tasks.

> [!NOTE]
> For an optimal developer experience, it is recommended to install [devenv](https://devenv.sh/) and [direnv](https://direnv.net/docs/installation.html).

Run the test suite:

```shell
just test
```

Run linters:

```shell
just lint
```

Some linter violations can automatically be fixed:

```shell
just fmt
```

## License

The project is licensed under the [MIT License](LICENSE).