setArray.js

arrayToPlain.js

// arrayToPlain.js v1
function arrayToPlain(array_, columns = 2, heading){
	// clone array
	array__ = array_.join('!@#$%$#@!').split('!@#$%$#@!');
	if(heading){
		array__ = [...heading, ...array__];
	};
	let csv = [];
	let column = 0;
	let tempArray = [];
	while(array__.length > 0){
		if(column != columns){
			column++;
			tempArray.push(array__.shift());
		}else{
			csv.push(tempArray.join('	'));
			column = 0;
			tempArray = [];
		};
	};
	if(tempArray.length > 0){
		csv.push(tempArray.join('	'));
	};
	return csv;
};

getArray.js

// getArray.js v1
function getArray(key, value){
	if( localStorage.getItem('array_' + key) == null ){
		return null;
	};
	return localStorage.getItem('array_' + key).split('!@#$%$#@!');
};

setArray.js

// setArray.js v1
function setArray(key, value){
	if(typeof value == 'string'){
		value = value.split(', ');
	};
	if( localStorage.getItem('array_' + key) != null ){
		let oldValue = localStorage.getItem('array_' + key).split('!@#$%$#@!');
		for(let i = 0; i < value.length; i++){
			oldValue.push(value[i]);
		};
		value = oldValue;
	};
	value = value.join('!@#$%$#@!');
	localStorage.setItem('array_' + key, value);
};