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is_number_validator.go
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/
is_number_validator.go
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package validators
import "fmt"
// Checks if the value is a number.
//
// Configuration parameters:
// - errorMessage (string): custom error message (optional).
//
// Input value (any): value to be validated.
//
// Usage examples:
//
// value1 := 1
// v.IsNumber()(value1) // Output: nil, false
//
// value2 := 1.0
// v.IsNumber()(value2) // Output: nil, false
//
// value3 := nil
// v.IsNumber()(value3) // Output: [error message], true
//
// value4 := ""
// v.IsNumber()(value4) // Output: [error message], true
// v.IsNumber("error")(value4) // Output: "error", true
func IsNumber(
errorMessage ...string,
) Validator {
message := ""
if len(errorMessage) != 0 {
message = errorMessage[0]
}
return func(value interface{}) (*string, bool) {
_, isInt := value.(int)
_, isFloat := value.(float64)
if !isInt && !isFloat {
if message == "" {
message = fmt.Sprintf(
"The value is not a number: value is %T.",
value,
)
}
return &message, true
}
return nil, false
}
}