oftypes

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Configurable 'typeof' analysis and responses. Javascript ESModule.

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Index of contents

• Installation
• Description
• Oftypes API
  • array_
  • arraybuffer_
  • async_
  • bigint_
  • boolean_
  • buffer_
  • dataview_
  • empty_
  • error_
  • function_
  • map_
  • nan_
  • null_
  • number_
  • object_
  • promise_
  • set_
  • string_
  • symbol_
  • undefined_
• NOT Oftype Functions
  • oftype_ enhanced typeof
  • resolvers
• JetBrains OSS Licence

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Installation

npm install oftypes

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Description

Simple and useful module to check data types.
Every method, related to retrieve data types, accepts the same parameters variable and resolvers.
Exception done for the methods:

• number_
• oftype_ enhanced typeof.

covered data types

• Array
• ArrayBuffer
• AsyncFunction
• BigInt
• Boolean
• Buffer
• DataView
• Empty (string, array, object, map, set, arraybuffer, dataview, buffer)
• Error
• Function
• Map
• NaN
• Null
• Number
• Object
• Promise
• Set
• String
• Symbol
• Undefined

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Oftypes API

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array_

signature
array_( variable: any, [ resolvers={true: true, false: false}] ):
Promise<boolean|unknown>

import { array_ } from 'oftypes'

console.log( await array_( [ 1 ] ) )

// prints true

import { array_ } from 'oftypes'

console.log( await array_( 10 ) )

// prints false

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arraybuffer_

signature
array_buffer_( variable: any, [ resolvers={true: true, false: false}] ):
Promise<boolean|unknown>

import { arraybuffer_ } from 'oftypes'

console.log( await arraybuffer_( new ArrayBuffer( 1 ) ) )

// prints true

import { arraybuffer_ } from 'oftypes'

console.log( await arraybuffer_( 10 ) )

// prints false

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async_

signature
async_( variable: any, [ resolvers={true: true, false: false}] ):
Promise<boolean|unknown>

import { async_ } from 'oftypes'

const variable = [ async() => {} ]
const resolvers = undefined

console.log( await async_( variable[ 0 ] ) )

// prints true

import { async_ } from 'oftypes'

const variable = new Promise( resolve => resolve( 'promise' ) )

console.log( await async_( variable ) )

// prints false

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bigint_

signature
bigint_( variable: any, [ resolvers={true: true, false: false}] ):
Promise<boolean|unknown>

import { bigint_ } from 'oftypes'

const variable = BigInt( 'oftypes' )

console.log( await bigint_( variable ) )
// prints true

import { bigint_ } from 'oftypes'

const variable = function ( ){}

console.log( await bigint_( variable ) )
// prints false

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boolean_

signature
boolean_( variable: any, [ resolvers={true: true, false: false}] ):
Promise<boolean|unknown>

import { boolean_ } from 'oftypes'

const variable = { object: () => {} }
const resolvers = { true: 'it is oftype boolean!', false: 'it is not oftype boolean' }

console.log( await boolean_( variable, resolvers ) )

// prints 'it is not oftype boolean!

import { boolean_ } from 'oftypes'

const variable = true
const resolvers = { true: 'it is oftype boolean!', false: 'it is not oftype boolean' }

console.log( await boolean_( variable, resolvers ) )

// prints 'it is oftype boolean!'

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buffer_

signature
buffer_( variable: any, [ resolvers={true: true, false: false}] ):
Promise<boolean|unknown>

import { buffer_ } from 'oftypes'

const variable = Buffer.from('hello folks')
const resolvers = { true: 'it is oftype buffer!', false: 'it is NOT oftype buffer' }

console.log( await buffer_( variable, resolvers ) )

// prints 'it is oftype buffer!'

import { buffer_ } from 'oftypes'

const variable = 'hello folks'
const resolvers = { true: 'it is oftype buffer!', false: 'it is NOT oftype buffer' }

console.log( await buffer_( variable, resolvers ) )

// prints 'it is NOT oftype buffer!'

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dataview_

signature
dataview_( variable: any, [ resolvers={true: true, false: false}] ):
Promise<boolean|unknown>

import { dataview_ } from 'oftypes'

const variable = new DataView(new ArrayBuffer(1))

console.log( await dataview_( variable ) )

// prints true

import { dataview_ } from 'oftypes'

const variable = 'reference not found'

console.log( await dataview_( variable ) )

// prints false

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empty_

signature
empty_( variable: any, [ resolvers={true: true, false: false}] ):
Promise<boolean|unknown>

import { empty_ } from 'oftypes'

console.log( await empty_( [] ) )

// prints true

import { empty_ } from 'oftypes'

console.log( await empty_( false ) )

// prints false

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error_

signature
error_( variable: any, [ resolvers={true: true, false: false}] ):
Promise<boolean|unknown>

import { error_ } from 'oftypes'

const variable = new ReferenceError('reference not found')

console.log( await error_( variable ) )

// prints true

import { error_ } from 'oftypes'

const variable = 'reference not found'

console.log( await error_( variable ) )

// prints false

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function_

signature
function_( variable: any, [ resolvers={true: true, false: false}] ):
Promise<boolean|unknown>

import { function_ } from 'oftypes'

const variable = 10

console.log( await function_( variable ) )

// prints false

import { function_ } from 'oftypes'

const variable = () => { console.log( 'I\'m a FUNCTION!' ) }
const resolvers = { true: true, false: false }

const resolved = await function_( variable, resolvers )
resolved()

// prints I'm a FUNCTION!

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map_

signature
map_( variable: any, [ resolvers={true: true, false: false}] ):
Promise<boolean|unknown>

import { map_ } from 'oftypes'

console.log( await map_( new Map() ) )

// prints true

import { map_ } from 'oftypes'

console.log( await map_( new Set() ) )

// prints false

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nan_

signature
nan_( variable: any, [ resolvers={true: true, false: false}] ):
Promise<boolean|unknown>

import { nan_ } from 'oftypes'

const variable = 10
const resolvers = { true: 'it is NaN!', false: 'it is not NaN' }

console.log( await nan_( variable, resolvers ) )

// prints it is not NaN!

import { nan_ } from 'oftypes'

const variable = { object: null }
const resolvers = { true: 'it is NaN!', false: 'it is not NaN' }

console.log( await nan_( variable.object, resolvers ) )

// prints it is NaN!

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null_

signature
null_( variable: any, [ resolvers={true: true, false: false}] ):
Promise<boolean|unknown>

import { null_ } from 'oftypes'

const variable = { object: null }
const resolvers = { true: 'it is null!', false: 'it is not null' }

console.log( await null_( variable, resolvers ) )

// prints it is not null!

import { null_ } from 'oftypes'

const variable = { object: null }
const resolvers = { true: 'it is null!', false: 'it is not null' }

console.log( await null_( variable.object, resolvers, payback ) )

// prints it is null!

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number_

signature
number_( variable: any, [ resolvers={true: true, false: false}], [ strict=true ] ):
Promise<boolean|unknown>

import { number_ } from 'oftypes'

const variable = 10
const resolvers = { true: 'it is a number!', false: 'it is not a number' }

console.log( await number_( variable, resolvers ) )

// prints it is a number!

import { number_ } from 'oftypes'

const variable = '10'
const resolvers = { true: 'it is a number!', false: 'it is not a number' }

console.log( await string_( variable, resolvers ) )

// prints it is a number!

disabling strict mode.

import { number_ } from 'oftypes'

const variable = '10'
const resolvers = { true: 'it is a number!', false: 'it is not a number' }

console.log( await number_( variable, resolvers, false ) )

// prints it is a number!

import { number_ } from 'oftypes'

const variable = 'folks'
const resolvers = { true: 'it is a number!', false: 'it is not a number' }

console.log( await number_( variable, resolvers ) )

// prints it is not a number!

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object_

signature
object_( variable: any, [ resolvers={true: true, false: false}] ):
Promise<boolean|unknown>

import { object_ } from 'oftypes'

const variable = [ 'hello folks!' ]
const resolvers = { true: 'it is an object!', false: 'it is not an object!' }

console.log( await object_( variable, resolvers ) )

// prints it is not an object!

import { object_ } from 'oftypes'

const variable = { array1: [ 'hello folks!' ] }
const resolvers = { true: 'it is an object!', false: 'it is not an object!' }

console.log( await object_( variable, resolvers ) )

// prints it is an object!

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promise_

signature
promise_( variable: any, [ resolvers={true: true, false: false}] ):
Promise<boolean|unknown>

import { promise_ } from 'oftypes'

const variable = new Promise( resolve => resolve( 'promise' ) )
console.log( await promise_( variable ) )

// prints true

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set_

signature
set_( variable: any, [ resolvers={true: true, false: false}] ):
Promise<boolean|unknown>

import { set_ } from 'oftypes'

console.log( await set_( new Map() ) )

// prints false

import { set_ } from 'oftypes'

console.log( await set_( new Set() ) )

// prints true

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string_

signature
string_( variable: any, [ resolvers={true: true, false: false}] ):
Promise<boolean|unknown>

import { string_ } from 'oftypes'

const variable = 'hello folks!'
const resolvers = { true: 'it is a string!', false: 'it is not a string' }

console.log( await string_( variable, resolvers ) )

// prints it is a string!

import { string_ } from 'oftypes'

const variable = ['hello folks!']

console.log( await string_( variable ) )


// prints false

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symbol_

signature
symbol_( variable: any, [ resolvers={true: true, false: false}] ):
Promise<boolean|unknown>

import { symbol_ } from 'oftypes'

const variable = Symbol( 'symbol_' )

console.log( await symbol_( variable ) )
// prints true

import { symbol_ } from 'oftypes'

const variable = Array(26)

console.log( await symbol_( variable ) )
// prints false

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undefined_

signature
undefined_( variable: any, [ resolvers={true: true, false: false}] ):
Promise<boolean|unknown>

import { undefined_ } from 'oftypes'

console.log( await undefined_( undefined ) )

// prints true

import { undefined_ } from 'oftypes'

console.log( await undefined_( null ) )

// prints false

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Not Oftypes Functions

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oftype_ enhanced typeof

signature
oftype_( variable: any, [ resolver<T>=Map<T, any>], [execute_callback={type:'async|sync|promise'}] ):
Promise<string|unknown>

it rejects if the resolver argument is undefined and the argument execute_callback is set.

• simple usage.

import { oftype_ } from 'oftypes'

console.log( await oftype_( 10 ) )

// prints -> Number

• using resolver argument.

import { oftype_ } from 'oftypes'

const resolver = new Map();
resolver.set( 'Array', 'it is an Array' );

console.log( await oftype_( [ 1, 3, 5 ], resolver ) )

// prints -> it is an Array

• it returns false if the resolver mismatches with the actual type of the variable.

import { oftype_ } from 'oftypes'

const variable = async ()=>{} /*AsyncFunction*/
const resolver = new Map();
resolver.set( 'Symbol', 'it is Symbol' );

console.log( await oftype_( variable, resolver ) )

// prints -> false

• it executes the callback function depending on the type given to the execute_callback property type.

import { oftype_ } from 'oftypes'

const variable = Symbol( 'symbol' )
const fn_callback = () => { console.log( type ) }
const resolver = new Map();
resolver.set( 'Symbol', fn_callback );

await oftype_( variable, resolver, {type:'sync'} )

// prints -> Symbol given

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resolvers

signature

resolvers(truthy: any, falsy: any, [ execute_callback={truthy: 'async|sync|promise', falsy: 'async|sync|promise'}] ):
Promise<uknown>

execute_callback argument will execute the given function (given to truthy&falsy arguments) depending on the type of the truthy and falsy properties. leave it undefined to return the resolver data.

// import the resolvers function.
import { boolean_, resolvers } from 'oftypes'

// usually the resolvers are set like this, and in case we are resolving many oftypes.[functions]
// we will need to declare many unique const/let variables with unique name.

const resolvers_as_object = { true: 'true', false: 'false' }
const boolean = 'string'

// instead of passing the argument as an object -> resolvers_as_object
// we directly pass the resolvers function with the two arguments set to 'true' and 'false' respectively
// the resolvers function will return the same things as the resolvers_as_object would do.

console.log( await boolean_( boolean, await resolvers( 'true', 'false' ) ) )

// prints 'false'

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JetBrains OSS License

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I want to thank JetBrains to grant me the Open Source Software licence for all their products. This opportunity gives me strength to keep on going with my studies and personal project.
To learn more about this opportunity, have a look at Licences for Open Source Development - Community Support.

Thank you

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Contacts

• twitter
• open-collective

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