Array of object manipulation example

filterarray.js

function filterByLetters(options, filter) {
	if (filter) {
		let data = [...options];
		let restData = [...options];
		const filterIsNum = parseInt(filter);
		let result = [];

		// filter with number
		if (filterIsNum) {
			const filtered = data
				.filter((item) => {
					return isMatch({
						str: getNumber(item.label),
						filter,
						num: true,
						hasMatch: true
					});
				})
				.sort(
					(a, b) => parseInt(getNumber(a.label)) - parseInt(getNumber(b.label))
				);
	

			const restOfList = restData.filter((item) => {
				return isMatch({ str: getNumber(item.label), filter, num: true });
			});

			result = [...filtered, ...restOfList];
		} else {
			// filter with letter
			const filtered = data.filter((item) =>
				isMatch({
					str: item.label,
					filter,
					hasMatch: true
				})
			);
		
			const restOfList = restData.filter((item) => {
				return isMatch({ str: item.label, filter });
			});

			result = [...filtered, ...restOfList];
		}

		return result;
	}

	// Do no filtering, just return all options
	return options;
}

function isMatch({ str, filter, num = false, hasMatch } = {}) {
	let result = true;

	for (let i = 0; i < filter.length; i++) {
		const src = num ? str[i] : str[i].toUpperCase();
		const filt = num ? filter[i] : filter[i].toUpperCase();

		if (hasMatch) {
			if (src !== filt) result = false;
		} else {
			if (src === filt) result = false;
		}
	}

	return result;
}

function getNumber(str) {
	return str.split('+')[1];
}