TypeTags .has

Overview#

The .has method allows us to check if an object has a valid toString method and/or if its value is equal to the received tag value. If tag is not defined, it will check only for the existence of the toString method.

Usage#

TypeTags.has(value, tag?)#

• Checks if value has a toString method. Accepts an optional tag argument of type string.

import { TypeTags } from 'typetags'

const user = {
  id: 1,
  name: 'Foo',
}

TypeTags.has(user)
// → true

TypeTags.has(user, 'Array')
// → false

TypeTags.has(user, 'Object')
// → true

Signature#

has(object: any, tag?: string): boolean