"use strict";
//Answers on interesting exercises  dKab/jasmine-tests
//Test 1
function sequence(start, step) {
	let st = start || 0;
	let sp = step || 1;
	let result = st - sp;

	var next = function () {
		result += sp;
		st = result;
	};

	return function () {
		next();
		return result;
	};
};

//Test 2
function take(fn, count) {
	let arr = [];
	for (let i = 0; i < count; i++)
		arr[i] = fn();

	return arr;
};

//Test 3
function map(fn, array) {
	let arr = [];
	for (let i = 0; i < array.length; i++) {
		arr[i] = fn(array[i]);
	}
	return arr;
};

//Test 4
function fmap(mixin, fn) {
	return function (...args) {
		return mixin(fn(...args));
	};
};

//Test 5
function partial(fn, ...part) {
	return function (...args) {
		return fn(...part, ...args)
	}
};

//Test 6
function partialAny(fn, ...args) {
	let arr = args.slice();

	return function (...part) {
		let i = 0;
		if (part.length !== 0) {
			for (let z = 0; z < arr.length; z++) {
				if (arr[z] === undefined)
					arr[z] = part[i++];
			}
		}
		arr = arr.concat(part.slice(i));

		return fn(...arr);
	}
};

//Test 7
function bind(fn, context) {
	return function (...a) {
		return fn.apply(context, a);
	}
};

//Test 8
function pluck(objects, fieldName) {
	let arr = [];
	for (let key in objects) {
		arr[key] = objects[key][fieldName];
	}
	return arr;
};

//Test 9
function filter(arr, fn) {
	let filtered = [];

	for(let i = 0; i in arr; i++) {
		if(fn(arr[i]))
			filtered.push(arr[i]);
	}

	return filtered;
};

//Test 10
function count(obj) {
	let count = 0;
	for(let key in obj)
		count++;

	return count;
}