abolish/validators/date/age.js

A javascript object validator.

"use strict";
module.exports = {
    name: "age",
    validator: (v, o, { error }) => {
        // convert string to date
        if (typeof v === "string")
            v = new Date(v);
        // check if o is a number
        if (typeof o === "number")
            o = `=${o}`;
        // check if o is a string
        // noinspection SuspiciousTypeOfGuard
        if (typeof o !== "string")
            return error(`:param validator option is invalid!`).setCode(`invalid.option`);
        // check if v is a valid date
        if (isNaN(v.getTime()))
            return error(`:param is not a valid Date!`).setCode(`invalid.date`);
        // get current year
        const currentYear = new Date().getFullYear();
        // get age
        const age = currentYear - v.getFullYear();
        // check if age is =
        if (o.startsWith("=")) {
            const ageString = o.slice(1);
            return ageString === String(age)
                ? true
                : error(`:param is not ${ageString} years old!`);
        }
        // check if age is >=
        else if (o.startsWith(">=")) {
            const minAge = Number(o.slice(2));
            return age >= minAge ? true : error(`:param is too young! Must be older than ${minAge}`);
        }
        // check if age is >
        else if (o.startsWith(">")) {
            const minAge = Number(o.slice(1));
            return age > minAge ? true : error(`:param is too young! Must be older than ${minAge}`);
        }
        // check if age is <=
        else if (o.startsWith("<=")) {
            const maxAge = Number(o.slice(2));
            return age <= maxAge ? true : error(`:param is too old! Must be younger than ${maxAge}`);
        }
        // check if age is <
        else if (o.startsWith("<")) {
            const maxAge = Number(o.slice(1));
            return age < maxAge ? true : error(`:param is too old! Must be younger than ${maxAge}`);
        }
        // check if age is between
        else if (o.includes("-")) {
            const [minAge, maxAge] = o.split("-").map(Number);
            return age >= minAge && age <= maxAge
                ? true
                : error(`:param is not between ${minAge} and ${maxAge} years old!`);
        }
        // if none of the above then return error
        else {
            return error(`:param validator option is invalid!`).setCode(`invalid.option`);
        }
    }
};