Join elements of an array given a delimiter (Recursive and Regular loop methods)

joinElements.js

const joinElements = (array, joiner) => {
	const recurse = (index, resultSoFor = '') => {
		resultSoFor += array[index];

		if (index == array.length - 1) {
			return resultSoFor;
		} else {
			resultSoFor = resultSoFor + joiner;
			return recurse(index + 1, resultSoFor);
		}
	};

	return recurse(0, '');
};

const joinElementsRegularLoop = (array, joiner) => {
	let resultSoFor = '';
	array.forEach((element, index) => {
		resultSoFor += array[index];
		if (index != array.length - 1) {
			resultSoFor = resultSoFor + joiner;
		}
	});

	return resultSoFor;
};

const result = joinElements(['s', 'cr', 't', 'cod', ' :):)'], 'e');
console.log(result);
const resultForRegularLoop = joinElementsRegularLoop(
	['s', 'cr', 't', 'cod', ' :):)'],
	'e'
);
console.log(resultForRegularLoop);