useless/base/infix/extensionMethods.js

Use Less. Do More. JavaScript on steroids.

"use strict";

const _ = require ('underscore')

/*  Extensions methods
    ======================================================================== */

;['method', 'property', 'flipped', 'forceOverride'].forEach (Meta.globalTag)
    
$global.$extensionMethods = (Type, methods) => {

    _.each (methods, (x, name) => {

        var fn = Meta.unwrap (x)
        var tags = Meta.tags (x)

        /*  define as _.method (this, ...)
         */
        if (!(name in _)) {
                      _[name] = _[name] || fn }

        /*  define as property of Type
         */
        if (!tags.method && (tags.property || (_.oneArg (fn)))) {
            if (!(name in Type.prototype) || tags.forceOverride) {
                _.defineHiddenProperty (Type.prototype, name, function () { return fn (this) }) } }

        /*  define as method
         */
        else if (!tags.property) {
            if (!(name in Type.prototype) || tags.forceOverride) {
                Object.defineProperty (Type.prototype, name, { writable: true, value: _.asMethod (tags.flipped ? _.flip (fn) : fn) }) } }

        else {
            throw new Error ('$extensionMethods: crazy input, unable to match') } })}