src/utils/objutils/mapOver.js

// jshint undef:true
// jshint unused:true
/*
Copyright (c) 2020, Nurul Choudhury
Permission to use, copy, modify, and/or distribute this software for any
purpose with or without fee is hereby granted, provided that the above
copyright notice and this permission notice appear in all copies.
THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/

/**
 * Apply a map function on array or object, if it is an object map over the vale for each object 'attribute/key'
 * creating a new object that has had the same keys but the values mapped. 
 *
 * If the object has 
 * @param  {Function} fn      [description]
 * @param  {Object} object    [description]
 * @return {[type]}           [description]
 */
export default  curry2(function (fn, object) {
	if(!object) return object;
	if(Array.isArray(object)) {
		let list = object;
		return list.map(fn);
	} 
	else if(typeof object.map === 'function'){
		// babel - do not transform map into array iteration
		// O: KEEP
		return object.map(fn);
	}
	else if( typeof object === 'object') {
		return Object.keys(object).reduce((obj,k,ix) => (obj[k] = fn(object[k],ix), obj),{});
	}
	else return fn(object);
});

/**
 * curry2 - curry a function that has two or more parameters. Currying allows us to produce a new function by 
 * combining a function and one or more arguments.
 * @param  {Function} fn [description]
 * @return {[type]}      [description]
 */
function curry2(fn) {
	if(typeof fn !== 'function') throw new Error('fn:('+fn+') function expected');
	if( fn.length < 2 ) return fn;
	return function _fn(...list) {

		switch( list.length ) {
		case 0: return _fn;
		case 1: {
			let a = list[0];
			return (...args) => fn(a,...args);
		}
		default: {
			return fn(...list);
		} 
		}
	};
}