v-number ( str -- n )
Form validators

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Vocabulary
validators

Inputs

str

a string

Outputs

n

a real

Word description
Converts the string into a real number, throwing a validation error if the string is not a valid real number.

Definition

USING: kernel math.parser ;

IN: validators

: v-number ( str -- n )
    [ string>number ] [ "must be a number" throw ] ?unless ;