strova-validation

Validation library for common use cases like notNull, notEmpty, min, max, ... Intention of this library is to support user entry validation and to support strova-assert that supports Defensive programming.

| Function | Description | | --- | --- | | isNull(arg) | returns true when argument is null or undefined | | notNull(arg) | negated isNull(arg) | | isBlank(arg) | for string only: returns true when argument is null, undefined, an empty string or string containing only white spaces.| | notBlank(arg) | negated isBlank(arg) | | isEmpty(arg) | returns true when tested argument is null or undefined, empty '' string, zero sized Array or Map, Object without properties | | notEmpty(arg) | negated isEmpty(arg) | | isNumber(arg) | true when argument is number | | isInteger(arg) | true when argument is integer number | | max(arg, limit) | true when arg is number and is less or equal to limit | | min(arg, limit) | true when arg is number and is greater or equal to limit |

Install

npm i --save strova-validation

Example

import {notNull, isNull, notBlank, min} from 'strova-validation';

const validateUser = (firstName, middleName, lastName, age) => (
  notBlank(firstName)
  && (isNull(middleName) || notBlank(middleName))
  && notBlank(lastName)
  && (notNull(age) && min(age, 1))
);

if (!validateUser('John')) {
  console.error('User is not valid');
}

See example.spec.js for more detailed example using tests.