— farr-this —

Documentation

Please see: Documentation

Arrays of bound functions with shared this parameters.

This module exports a class FarrThis, that extends the native Array class (via its parent class Farr).

Anytime an array-index-valued property of a FarrThis is set, the provided value gets filtered:

• If the value is a function, it's bound.
• If the value is not a function, it's replaced by a new bound function that produces the value when called.

This means that FarrThis arrays only store bound function elements or empty slots.

this Binding

Each function element has a bound this property corresponding to a plain object with some common parameters:

1. a: the containing instance (FarrThis)
2. i: the index of this element in the containing instance (integer)
3. f: a reference to this element (function)
4. o: any user-specified object, also accessible as the o property of the containing instance ('object')

Farr

For convienience, this module also exports its parent class, Farr).

Installation

Run npm install farr-this

Usage

import { FarrThis as Ft } from 'farr'
const n = 5
function e () {
  return this.i
}
const a = new Array(n).fill(e)
const f = new Ft({ a })
f.push(e)
const result = await f.all() // [ 0, 1, 2, 3, 4, 5 ]

Testing

Run npm test. This will also trigger a download of the tests from the farr dependency. These tests will be stored and run in the test/farrtest directory, so don't put anything there.

Incompatibilities

The following features of farr are incompatible with farr-this:

• generated: all elements undergo mutation
• givenFunc: all elements undergo mutation