benaston

var need = require('niid').need;
var mix = require('mixx').mix;

var defaultOptions = Object.freeze({ foo: undefined, 
                                     bar: undefined, 
                                     bam: null, 
                                     baz: null });

function MyThing(options) {
  need(options, 'foo', 'bar'); // `foo` and `bar` are required.

benaston

Motivation

• Partial application is fundamental to functional-style programming
• It is the binding of arguments to parameters before a function is invoked
• This technique is often used by ECMAScript developers who are:
  • seeking to avoid the use of new and/or this
  • deliberately trying to avoid function genericism
  • trying to improve consistency of style
• Partial application is currently supported by Function.prototype.bind, but the syntax is verbose, and the target of the bound function comes first, diluting the semantic
• Writing a custom function to provide partial application is straightforward (indeed there are many open source libraries providing this such as _.partial), however developers taking this approach are constrained in their ability to achieve syntactic tenseness lest they surprise other developers
• A terse, native syntax for partial application that does not affect the target of a function will improve consistency, clarity of intent and legibility