Golang interface conversions.go

package main

import "strconv"

func interfaceToFloat(value interface{}) float64 {
	if value == nil {
		return 0.0
	}
	switch typedValue := value.(type) {
	case float64:
		return typedValue
	case float32:
		return float64(typedValue)
	case int:
		return float64(typedValue)
	case uint:
		return float64(typedValue)
	case string:
		floatValue, _ := strconv.ParseFloat(typedValue, 10)
		return floatValue
	default:
		return 0.0
	}
}

func interfaceToString(value interface{}) string {
	switch typedValue := value.(type) {
	case string:
		return typedValue
	default:
		return ""
	}
}

func interfaceToInt64(value interface{}) int64 {
	if value == nil {
		return 0
	}
	switch typedValue := value.(type) {
	case int64:
		return typedValue
	case int8:
		return int64(typedValue)
	case int16:
		return int64(typedValue)
	case int32:
		return int64(typedValue)
	case uint8:
		return int64(typedValue)
	case uint16:
		return int64(typedValue)
	case uint32:
		return int64(typedValue)
	case int:
		return int64(typedValue)
	case uint:
		return int64(typedValue)
	default:
		return 0
	}
}

func interfaceToArray(value interface{}) []interface{} {
	if value == nil {
		return make([]interface{}, 0)
	}
	switch typedValue := value.(type) {
	case []interface{}:
		return typedValue
	default:
		return make([]interface{}, 0)
	}
}

func interfaceToMap(value interface{}) map[interface{}]interface{} {
	if value == nil {
		return make(map[interface{}]interface{}, 0)
	}
	switch typedValue := value.(type) {
	case map[interface{}]interface{}:
		return typedValue
	default:
		return make(map[interface{}]interface{})
	}
}

func interfaceArrayToStringsArray(args []interface{}) []string {
	result := make([]string, len(args), len(args))

	for _, arg := range args {
		s := interfaceToString(arg)
		if len(s) != 0 {
			result = append(result, s)
		}
	}

	return result
}