TypeTags .of

Overview

The .of method allows you to map through the values of any Array object and return the type tag of each array entry.

Usage

TypeTags.of(value | [values])
  • Returns the type tag of a single value or an array of type tags.
import { TypeTags } from 'typetags'


const myArray = [1, 'Hey', new Map()]


const tags = TypeTags.of(myArray)


console.log(tags)
// → [ '[object Number]', '[object String]', '[object Map]' ]

Values must be wrapped on an array, otherwise it will return the type tag of the its first argument.

TypeTags.of(12, '', [])
// → [object Number]

If it receives a single value or an empty array, it will return the type tag of the value itself.

import { TypeTags } from 'typetags'


const emptyArray = []


TypeTags.of(emptyArray)
// → [object Array]


TypeTags.of('')
// → [object String]

You can also use the .of method in point-free (tacit programming) style.

import { TypeTags } from 'typetags'


const myArray = [{ id: 1, name: 'Foo' }, [1, 2, 3]]


myArray.map(TypeTags.of)
// → [ '[object Object]', '[object Array]' ]


const hasObject = (a) => a.map(TypeTags.of).some(TypeTags.isObject)


hasObject(myArray) // → true

Signature

of<T>(value: Types | NestedTypes | Array<T>): Array<Tags> | Tags