wrapper-chain v1.0.2

wrapper-chain: chainable object wrapping

:package: Wrap any object or function with pre-defined chainable methods

const WrapperChain = require('wrapper-chain')
const wrappers = {
  shift: function (dX, dY) {
    return (x) => this(x - dX) + dY
  }
}

let f = (x) => 2 * x

f = new WrapperChain(f, wrappers)           // f(x) = 2 * x
f = f.shift(5, 0)                           // f(x) = 2 * (x - 5)
f = f.shift(5, 0)                           // f(x) = 2 * (x - 10)
f = f.shift(0, 5)                           // f(x) = 2 * (x - 10) + 5

Usage

new WrapperChain(object, wrappers)

Returns a wrapper containting the specified object

Parameters

• object The object to be wrapped
• wrappers All functions that can be applied to the object

Writing wrapper functions

Each key in the wrappers object is a method name and the corresponding value is a wrapper function. wrapper functions could take any number of parameters and should return the modified object. The original object is available as this inside the functions. Whether or not it will be mutated or not is up to you to decide.

Warning: Don't use arrow functions to implement wrappers or you will lose this context!

Install

npm install wrapper-chain --save

License

MIT