javascript_practice/hw06/index.js

// a
function aSample() {
	function a(string){
		alert(string);
	}
	a("Привет!");
}

// cube
function cubeSample() {
	function cube(number){
		return Math.pow(number, 3)
	}

	console.log(cube(9)); // 729
}

// avg2
function avg2Sample() {
	function avg2(number1, number2) {
		return (number1 + number2) / 2;
	}

	console.log(avg2(1, 2)); // 1.5
	console.log(avg2(10, 5)) // 7.5
}


// sum3
function sum3Sample() {
	function sum3(...rest) {
		return Array.from(rest).reduce((a, b) => a + b);
	}

	console.log(sum3(1,2,3)) // => 6
	console.log(sum3(5,10,100500)) // => 100515
	console.log(sum3(5,10)) // => 15
}

// intRandom
function intRandomSample() {
	function intRandom(maximalValue, minimalValue = 0) {
		return Math.floor(Math.random() * (maximalValue - minimalValue + 1) + minimalValue);
	}

	console.log(intRandom(2, 15));
	console.log(intRandom(-1, -1));
	console.log(intRandom(0, 1));
	console.log(intRandom(10));
}

// greetAll
function greetAllSample() {
	function greetAll(...params) {
		let greetString = '';
		Array.from(params).forEach(element => {
			greetString += `${element}, `;
		});
		return alert(`Hello ${greetString.slice(0, -2)}`);
	}

	greetAll("Superman"); // Hello Superman
	greetAll("Superman", "SpiderMan"); // Hello Superman, SpiderMan
	greetAll('Superman', 'SpiderMan', 'Captain Obvious'); // Hello Superman, SpiderMan, Captain Obvious
}

// sum
function sumSample() {
	function sum() {
		let sum = 0;
		for (let item of arguments) {
			sum += item;
		}
		return sum;
	}

	console.log(sum(1)) // 1
	console.log(sum(2)) // 2
	console.log(sum(10, 20, 40, 100)) // 170
}

// Union
let sample = prompt("Введите название задания");
switch (sample.toLowerCase()) {
	case "a":
		aSample();
		break;
	case "cube":
		cubeSample();
		break;
	case "avg2":
		avg2Sample();
		break;
	case "sum3":
		sum3Sample();
		break;
	case "intrandom":
		intRandomSample();
		break;
	case "greetall":
		greetAllSample();
		break;
	case "sum":
		sumSample();
		break;
	default:
		alert('Неверное название задания');
}

// Union declarative
let sampleDeclarative = prompt("Введите название задания");

const callSample = (sampleType) => {
	const sampleObj = {
		'a': aSample,
		'cube': cubeSample,
		'avg2': avg2Sample,
		'sum3': sum3Sample,
		'intrandom': intRandomSample,
		'greetall': greetAllSample,
		'sum': sumSample,
		'default': () => {
			alert('Неверное название задания');
		}
	};

	return (sampleObj[sampleType] || sampleObj['default'])();
}

callSample(sampleDeclarative);