Exercises & activities from the go workshop provided by Packt: https://courses.packtpub.com/courses/go
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62 lines
1.2 KiB
62 lines
1.2 KiB
package main
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import (
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"errors"
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"fmt"
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)
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func doubler(v interface{}) (string, error) {
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switch t := v.(type) {
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case string:
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return t + t, nil
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case bool:
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if t {
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return "truetrue", nil
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}
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return "falsefalse", nil
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case float32, float64:
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if f, ok := t.(float64); ok {
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return fmt.Sprint(f * 2), nil
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}
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return fmt.Sprint(t.(float32) * 2), nil
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case int:
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return fmt.Sprint(t * 2), nil
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case int8:
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return fmt.Sprint(t * 2), nil
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case int16:
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return fmt.Sprint(t * 2), nil
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case int32:
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return fmt.Sprint(t * 2), nil
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case int64:
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return fmt.Sprint(t * 2), nil
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case uint:
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return fmt.Sprint(t * 2), nil
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case uint8:
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return fmt.Sprint(t * 2), nil
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case uint16:
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return fmt.Sprint(t * 2), nil
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case uint32:
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return fmt.Sprint(t * 2), nil
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case uint64:
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return fmt.Sprint(t * 2), nil
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default:
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return "", errors.New("unsupported type passed")
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}
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}
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func main() {
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res, _ := doubler(-5)
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fmt.Println("-5: ", res)
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res, _ = doubler(5)
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fmt.Println("5: ", res)
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res, _ = doubler("yum")
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fmt.Println("yum: ", res)
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res, _ = doubler(true)
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fmt.Println("true:", res)
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res, _ = doubler(float32(3.14))
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fmt.Println("3.14:", res)
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}
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