is2

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.

Return:

• 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.

Return:

• 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.

Return:

• 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.

Return:

• 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.

Return:

• 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.

Return:

• Boolean true if 'value' is equal to 'other', false otherwise

NON_HOST_TYPES

JS Type definitions which cannot host values.

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.

Return:

• 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.

Return:

• Boolean true if 'value' is an instance of 'constructor'.

buffer(value)

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

Params:

• Any value value to test.

Return:

• Boolean true if 'value' is an instance of 'constructor'.

null(value)

Test if 'value' is null.

Params:

• Any value to test.

Return:

• Boolean true if 'value' is null, false otherwise.

undefined(value)

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

Params:

• Any value value to test.

Return:

• 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

Return:

• 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

Return:

• 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.

Return:

• 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.

Return:

• 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.

Return:

• 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.

Return:

• 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.

Return:

• 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.

Return:

• Boolean true if 'value' is a boolean, false otherwise.

false(value)

Test if 'value' is false.

Params:

• Any value value to test.

Return:

• Boolean true if 'value' is false, false otherwise

true(value)

Test if 'value' is true.

Params:

• Any value to test.

Return:

• Boolean true if 'value' is true, false otherwise.

date(value)

Test if 'value' is a date.

Params:

• Any value value to test.

Return:

• 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.

Return:

• 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.

Return:

• Boolean true if 'value' is a function, false otherwise.

number(value)

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

Params:

• Any value to test.

Return:

• 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.

Return:

• 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.

Return:

• 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.

Return:

• 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.

Return:

• 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.

Return:

• 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.

Return:

• 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.

Return:

• 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.

Return:

• 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.

Return:

• 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

Return:

• Boolean true if value is not a number, false otherwise

even(value)

Test if 'value' is an even number.

Params:

• Number value to test.

Return:

• Boolean true if 'value' is an even number, false otherwise.

odd(value)

Test if 'value' is an odd number.

Params:

• Number value to test.

Return:

• 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.

Return:

• 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.

Return:

• 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

Return:

• 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

Return:

• 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.

Return:

• 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.

Return:

• 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.

Return:

• 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.

Return:

• 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.

Return:

• Boolean true if 'value' is a regexp, false otherwise.

string(value)

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

Params:

• Any value to test.

Return:

• 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.

Return:

• 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.

Return:

• Boolean true if 'value' is a non-empty string, false otherwise.