be-type

be-type is based on ECMAScript2015+ proxy feature

Usage

yarn add be-type
npm install --save be-type

JavaScript:

import be from 'be-type';
be.function(()=>{}); // true

Custom type check:

//be.js
import be,{setBe} from 'be-type';
export default setBe({
    Negative:(value)=> be.Number(negative) && negative < 0
})
//other.js
import be from '../be.js';
be.Negative(-1); // true

API

Interface Rule:

1. If the first letter of the API is lowercase, then it refers to toString.call(value), the type returned by call.

be.function(()=>{}) equivalent toString.call(()=>{}) ==== "[object Function]"

be.generatorFunction(function* (){}) equivalent toString.call(function* (){}) ==== "[object GeneratorFunction]"

be.uint8Array(new Uint8Array()) equivalent toString.call(new Uint8Array()) ==== "[object Uint8Array]" etc..

2. if the first letter of the API is Uppercase, it means not toString.call(value), Custom type returned by call

Default built-in type check:

| Interface | Spec | | :------------ | -----------------------------------------:| | Function | plain function | | Object | plain object | | String | basic string | | Number | basic number | | Boolean | basic boolean | | NaN | strict equality to NaN | | Nil | null or undefined | | Empty | none length | | Infinity | strict equality to Infinity | | Finite | basic number and not NaN or Infinity | | Native | pristine native function | | SafeInteger | based on Number.isSafeInteger | | Integer | based on Number.isInteger | | Element | HTML Element |