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A type checking library where each exported function returns either true or false and does not throw. Also added tests.

Package Exports

  • is2

This package does not declare an exports field, so the exports above have been automatically detected and optimized by JSPM instead. If any package subpath is missing, it is recommended to post an issue to the original package (is2) to support the "exports" field. If that is not possible, create a JSPM override to customize the exports field for this package.

Readme

is2

is2 is a type-checking module for node.js to test values. Is does not throw exceptions and every function only returns true or false. Use is2 to validate types in your node.js code. Every function in is2 returns either true of false.

After finding Enrico Marino's module is, the concise syntax amazed, but there were syntax issues that made using is difficult. This fork of is fixes those issues, but the module is no longer cross-platform. Also, added tests via mocha which can be run using 'npm test'.

Installation

To install is2, type:

$ npm install is2

Usage

var is = require('is2');

console.log('true is equal to 1===1: '+(is.equal(true, 1===1));
console.log('10 is a positive number: '+(is.positiveNumber(10));
console.log('11 is an odd number: '+(is.oddNumber(11));

API

type(value, type)

Test if 'value' is a type of 'type'. Alias: a

Params:
  • value value to test.
  • String type THe name of the type.
Returns:
  • Boolean true if 'value' is an arguments object, false otherwise.

defined(value)

Test if 'value' is defined. Alias: def

Params:
  • Any value The value to test.
Returns:
  • Boolean true if 'value' is defined, false otherwise.

nullOrUndef(value)

Test is 'value' is either null or undefined. Alias: nullOrUndef

Params:
  • Any value value to test.
Returns:
  • Boolean True if value is null or undefined, false otherwise.

empty(value)

Test if 'value' is empty. To be empty means to be an array, object or string with nothing contained.

Params:
  • Any value value to test.
Returns:
  • Boolean true if 'value' is empty, false otherwise.

objEquals(value, other)

Do a deep comparision of two objects for equality. Will recurse without any limits. Meant to be called by equal only.

Params:
  • Object value The first object to compare.
  • Object other The second object to compare.
Returns:
  • Boolean true, if the objects are equivalent, false otherwise.

equal(value, other)

Test if 'value' is equal to 'other'. Works for objects and arrays and will do deep comparisions, using recursion. Alias: eq

Params:
  • Any value value.
  • Any other value to compare with.
Returns:
  • Boolean true if 'value' is equal to 'other', false otherwise

hosted(value, host)

Test if 'key' in host is an object. To be hosted means host[value] is an object.

Params:
  • Any value The value to test.
  • Any host Host that may contain value.
Returns:
  • Boolean true if 'value' is hosted by 'host', false otherwise.

instanceOf(value)

Test if 'value' is an instance of 'constructor'. Aliases: instOf, instanceof

Params:
  • Any value value to test.
Returns:
  • Boolean true if 'value' is an instance of 'constructor'.

buffer(value)

Test if 'value' is an instance of Buffer.

Params:
  • Any value value to test.
Returns:
  • Boolean true if 'value' is an instance of 'constructor'.

null(value)

Test if 'value' is null.

Params:
  • Any value to test.
Returns:
  • Boolean true if 'value' is null, false otherwise.

undefined(value)

Test if 'value' is undefined. Aliases: undef, udef

Params:
  • Any value value to test.
Returns:
  • Boolean true if 'value' is undefined, false otherwise.

arguments(value)

Test if 'value' is an arguments object. Alias: args

Params:
  • Any value value to test
Returns:
  • Boolean true if 'value' is an arguments object, false otherwise

emptyArguments(value)

Test if 'value' is an arguments object that is empty. Alias: args

Params:
  • Any value value to test
Returns:
  • Boolean true if 'value' is an arguments object with no args, false otherwise

array(value)

Test if 'value' is an array. Alias: ary, arry

Params:
  • Any value value to test.
Returns:
  • Boolean true if 'value' is an array, false otherwise.

nonEmptyArray(value)

Test if 'value' is an array containing at least 1 entry. Aliases: nonEmptyArry, nonEmptyAry

Params:
  • Any value The value to test.
Returns:
  • Boolean true if 'value' is an array with at least 1 value, false otherwise.

nonEmptyArray(value)

Test if 'value' is an array containing no entries. Aliases: emptyArry, emptyAry

Params:
  • Any value The value to test.
Returns:
  • Boolean true if 'value' is an array with no elemnets.

empty(value)

Test if 'value' is an empty array(like) object. Aliases: arguents.empty, args.empty, ary.empty, arry.empty

Params:
  • Any value value to test.
Returns:
  • Boolean true if 'value' is an empty array(like), false otherwise.

arrayLike(value)

Test if 'value' is an arraylike object (i.e. it has a length property with a valid value) Aliases: arraylike, arryLike, aryLike

Params:
  • Any value value to test.
Returns:
  • Boolean true if 'value' is an arguments object, false otherwise.

boolean(value)

Test if 'value' is a boolean. Alias: bool

Params:
  • Any value value to test.
Returns:
  • Boolean true if 'value' is a boolean, false otherwise.

false(value)

Test if 'value' is false.

Params:
  • Any value value to test.
Returns:
  • Boolean true if 'value' is false, false otherwise

true(value)

Test if 'value' is true.

Params:
  • Any value to test.
Returns:
  • Boolean true if 'value' is true, false otherwise.

date(value)

Test if 'value' is a date.

Params:
  • Any value value to test.
Returns:
  • Boolean true if 'value' is a date, false otherwise.

error(value)

Test if 'value' is an error object. Alias: err

Params:
  • value value to test.
Returns:
  • Boolean true if 'value' is an error object, false otherwise.

function(value)

Test if 'value' is a function. Alias: func

Params:
  • Any value value to test.
Returns:
  • Boolean true if 'value' is a function, false otherwise.

number(value)

Test if 'value' is a number. Alias: num

Params:
  • Any value to test.
Returns:
  • Boolean true if 'value' is a number, false otherwise.

positiveNumber(value)

Test if 'value' is a positive number. Alias: positiveNum, posNum

Params:
  • Any value to test.
Returns:
  • Boolean true if 'value' is a number, false otherwise.

negativeNumber(value)

Test if 'value' is a negative number. Aliases: negNum, negativeNum

Params:
  • Any value to test.
Returns:
  • Boolean true if 'value' is a number, false otherwise.

decimal(value)

Test if 'value' is a decimal number. Aliases: decimalNumber, decNum

Params:
  • Any value value to test.
Returns:
  • Boolean true if 'value' is a decimal number, false otherwise.

divisibleBy(value, n)

Test if 'value' is divisible by 'n'. Alias: divisBy

Params:
  • Number value value to test.
  • Number n dividend.
Returns:
  • Boolean true if 'value' is divisible by 'n', false otherwise.

int(value)

Test if 'value' is an integer. Alias: integer

Params:
  • Any value to test.
Returns:
  • Boolean true if 'value' is an integer, false otherwise.

positiveInt(value)

Test if 'value' is a positive integer. Alias: posInt

Params:
  • Any value to test.
Returns:
  • Boolean true if 'value' is a positive integer, false otherwise.

negativeInt(value)

Test if 'value' is a negative integer. Aliases: negInt, negativeInteger

Params:
  • Any value to test.
Returns:
  • Boolean true if 'value' is a negative integer, false otherwise.

maximum(value, others)

Test if 'value' is greater than 'others' values. Alias: max

Params:

  • Number value value to test.

  • Array others values to compare with.

Returns:
  • Boolean true if 'value' is greater than 'others' values.

minimum(value, others)

Test if 'value' is less than 'others' values. Alias: min

Params:
  • Number value value to test.
  • Array others values to compare with.
Returns:
  • Boolean true if 'value' is less than 'others' values.

nan(value)

is.nan Test if value is not a number.

Params:
  • Mixed value value to test
Returns:
  • Boolean true if value is not a number, false otherwise

even(value)

Test if 'value' is an even number.

Params:
  • Number value to test.
Returns:
  • Boolean true if 'value' is an even number, false otherwise.

odd(value)

Test if 'value' is an odd number.

Params:
  • Number value to test.
Returns:
  • Boolean true if 'value' is an odd number, false otherwise.

ge(value, other)

Test if 'value' is greater than or equal to 'other'. Aliases: greaterOrEq, greaterOrEqual

Params:
  • Number value value to test.
  • Number other value to compare with.
Returns:
  • Boolean true, if value is greater than or equal to other, false otherwise.

gt(value, other)

Test if 'value' is greater than 'other'. Aliases: greaterThan

Params:
  • Number value value to test.
  • Number other value to compare with.
Returns:
  • Boolean true, if value is greater than other, false otherwise.

le(value, other)

Test if 'value' is less than or equal to 'other'. Alias: lessThanOrEq, lessThanOrEqual

Params:
  • Number value value to test
  • Number other value to compare with
Returns:
  • Boolean true, if 'value' is less than or equal to 'other', false otherwise.

lt(value, other)

Test if 'value' is less than 'other'. Alias: lessThan

Params:
  • Number value value to test
  • Number other value to compare with
Returns:
  • Boolean true, if 'value' is less than 'other', false otherwise.

within(value, start, finish)

Test if 'value' is within 'start' and 'finish'. Alias: withIn

Params:
  • Number value value to test.
  • Number start lower bound.
  • Number finish upper bound.
Returns:
  • Boolean true if 'value' is is within 'start' and 'finish', false otherwise.

object(value)

Test if 'value' is an object. Note: Arrays, RegExps, Date, Error, etc all return false. Alias: obj

Params:
  • Any value to test.
Returns:
  • Boolean true if 'value' is an object, false otherwise.

nonEmptyObject(value)

Test if 'value' is an object with properties. Note: Arrays are objects. Alias: nonEmptyObj

Params:
  • Any value to test.
Returns:
  • Boolean true if 'value' is an object, false otherwise.

objectInstanceof(objInst, objType)

Test if 'value' is an instance type objType. Aliases: objInstOf, objectinstanceof, instOf, instanceOf

Params:
  • object objInst an object to testfor type.
  • object objType an object type to compare.
Returns:
  • Boolean true if 'value' is an object, false otherwise.

regexp(value)

Test if 'value' is a regular expression. Alias: regexp

Params:
  • Any value to test.
Returns:
  • Boolean true if 'value' is a regexp, false otherwise.

string(value)

Test if 'value' is a string. Alias: str

Params:
  • Any value to test.
Returns:
  • Boolean true if 'value' is a string, false otherwise.

emptyString(value)

Test if 'value' is an empty string. Alias: emptyStr

Params:
  • Any value to test.
Returns:
  • Boolean true if 'value' is am empty string, false otherwise.

nonEmptyString(value)

Test if 'value' is a non-empty string. Alias: nonEmptyStr

Params:
  • Any value to test.
Returns:
  • Boolean true if 'value' is a non-empty string, false otherwise.

emailAddress(value)

Test if value is a valid email address. We're testing only the email address not the user name with an email address, edmond@stdarg.com and not "Edmond Meinfelder" edmond@stdarg.com. The email address does not need a fully qualified host, but does expect an '@host', so 'edmond' is false but 'edmond@stdarg' is true. Aliases: email, emailAddr

Params:
  • Any value to test.
Returns:
  • Boolean true if 'value' is a valid email address and false otherwise.

ipv4Address(value)

Test if a value is a valid IPv4 numeric address. Non-routable IPv4 address are still valid addresses. This function expects 4 octets separated by '.' with valid values of 0-255 inclusive. Aliases: ipv4, ipv4Addr

Params:
  • Any value to test.
Returns:
  • Boolean true if 'value' is a valid ipv4 address and false otherwise.

ipv6Address(value)

Test if a value is a valid IPv6 numeric address. Aliases: ipv6, ipv6Addr

Params:
  • Any value to test.
Returns:
  • Boolean true if 'value' is a valid IPv6 address and false otherwise.

ipAddress(value)

Test if a value is a valid IPv6 or IPv4 numeric address. Aliases: ip, ipAddr

Params:
  • Any value to test.
Returns:
  • Boolean true if 'value' is a valid IPv6 or IPv4 address and false otherwise.

dnsAddress(value)

Test if a value is a valid DNS address. Aliases: dns, dnsAddr

Params:
  • Any value to test.
Returns:
  • Boolean true if 'value' is a valid DNS address and false otherwise.

hostAddress(value)

Test if a value is a valid IPv4, ipv6 or DNS address. Aliases: hostIp, hostAddr

Params:
  • Any value to test.
Returns:
  • Boolean true if 'value' is a valid IPv4, IPv6 or DNS address and false otherwise.

port(value)

Test if a value is a valid TCP/IP port number.

Params:
  • Any value to test.
Returns:
  • Boolean true if 'value' is a valid port number, and false otherwise.

License

The MIT License (MIT)

Copyright (c) 2013 Edmond Meinfelder

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.