exercises.js

const ascendingOrderFrequency = arr => {
	const convertObjToArray = obj => Object.keys(obj).map(key => [key, obj[key]]);
	const frequencyOrderedObj = arr.reduce((acc, curr) => {
		acc[curr] ? (acc[curr] += 1) : (acc[curr] = 1);
		return acc;
	}, {});
	return convertObjToArray(frequencyOrderedObj);
};

const numbersMultipleOf = () => {
	const divisible = (number, by) => number % by === 0;
	let numbers = [];
	for (let i = 1; i <= 200; i++) {
		if (divisible(i, 3) && divisible(i, 5)) {
			numbers[i] = `${i} BlueRed`;
		} else if (divisible(i, 3)) {
			numbers[i] = `${i} Blue`;
		} else if (divisible(i, 5)) {
			numbers[i] = `${i} Red`;
		} else {
			numbers[i] = `${i}`;
		}
	}
	return numbers;
};

const isPalindrome = (word) => typeof word === 'string' && word === word.split('').reverse().join('');

console.log(ascendingOrderFrequency([1, 2, 4, 5, 6, 8, 2, 5, 3, 2, 1]));
numbersMultipleOf().map(item => console.log(item));
console.log(isPalindrome("civic"));