@danielkalen/is

Collection of common bool functions for checking the type of a given value.

Usage

var IS = require('@danielkalen/is')
IS.defined(...)
IS.array(...)

var IS2 = IS.create() // Create a new copy of the checks collection
var IS3 = IS.create('natives', 'dom') // Create copy and load these check functions

assert(IS2 !== IS3)
assert(typeof IS2.domEl === 'undefined')
assert(typeof IS3.domEl === 'function')

IS2.load('dom') // load the dom check group
assert(typeof IS2.domEl === 'function')

IS3.load({
    bool: (subject)=> typeof subject === 'boolean'
}) // load custom check group
assert(typeof IS2.bool === 'undefined')
assert(typeof IS3.bool === 'function')

Available Checks

natives (loaded by default)

• IS.defined(...) check if value is not undefined
• IS.array(...) check if value is an array
• IS.object(...) check if value is an object type (excluding null)
• IS.objectPlain(...) check if value is a plain object (e.g. not array, not custom constructor)
• IS.string(...) check if value is a string
• IS.number(...) check if value is a number
• IS.numberLoose(...) check if value is a number or a string that can be resovled to a number
• IS.function(...) check if value is a function
• IS.iterable(...) check if value is an iterable (e.g. fn arguments)

dom

these are available only after calling IS.load('dom') or IS.create('natives','dom')

• IS.domDoc(...) check if value is a DOM Document object
• IS.domEl(...) check if value is a DOM element node (false for text node)
• IS.domText(...) check if value is a DOM text node
• IS.domNode(...) check if value is a DOM element or text node
• IS.domTextarea(...) check if value is a Textarea element
• IS.domInput(...) check if value is an Input element
• IS.domSelect(...) check if value is a Select element
• IS.domField(...) check if value is a Textarea,Input, or Select element

License MIT