Function curry

ch11-code/fp-helpers.js:60–73

(fn,arity = fn.length)

}

function curry(fn,arity = fn.length) {
	return (function nextCurried(prevArgs){
		return function curried(nextArg){
			var args = [ ...prevArgs, nextArg ];

			if (args.length >= arity) {
				return fn( ...args );
			}
			else {
				return nextCurried( args );
			}
		};
	})( [] );
}

function uncurry(fn) {
	return function uncurried(...args){