Like instanceof, but uses class name strings.
npm install is-instance-ofLike instanceof, but uses class name strings. This means the module works cross-frame, unlike instanceof.
Requires Node.js 6.0.0 or above.
``bash`
npm i is-instance-of
The module exports a single function.
1. Bindable: x (object): The object that may or may not be an instance of the specified class(es).classes
2. (function, string, or array of functions/strings): Class names to look for in x’s prototype chain. (If one or more functions are provided, their names will be used, so that the check works cross-realm.)ci
3. Object argument:
* Optional: (boolean): If true, class names will be compared case-insensitively. Defaults to false.
* true if x has any one of the classes in its prototype chain.false
* otherwise.
`javascript
const isInstanceOf = require('is-instance-of')
isInstanceOf(new Date(), 'Date') // true
isInstanceOf(new Date(), Date) // true
// Case sensitivity / insensitivity
isInstanceOf(new Date(), 'date') // false
isInstanceOf(new Date(), 'date', {ci: true}) // true
// Only one class name needs to be matched for true to be returned
isInstanceOf(new Error(), ['Error', 'Date', RegExp]) // true
// Supports the bind operator
[]::isInstanceOf('Array') // true
`
This module’s strength is also its weakness. The module will consider Date in one frame/context to be equivalent to Date in another context, so long as they have the same name. The advantage of this approach is that this allows for cross-frame type checks. The disadvantage is that Date could be a completely different class in the other context and this module wouldn’t know the difference.
* class-chain: Returns an object’s class and its ancestors.
* isit: Tests a value’s type against a string like 'positive integer' or 'non-empty map'`.