javascript cheats

Mi_Js_CheatSheet.js

//flatten array (if `flat` is missing)

const flatten = (input) => {
    return input.reduce((a,c)=>{
        return util.isArray(c) ? a.concat(flatten(c)) : a.concat(c);
    },[]);
}

//module exports shortcut

module.exports.foo = ()=> 'foo'

//console function to extract youtube videos by title filter
function selectURL(text){
	return Array.from(document.querySelectorAll('h3.ytd-playlist-video-renderer')).filter(item=>{
		const label = item.getAttribute('aria-label');
		console.log('item',label);
		return label.indexOf(text)>-1;
	}).flatMap(item =>{
		const label = item.getAttribute('aria-label');
		return Array.from(item.childNodes).filter(it=>it['href'])
		.map(it=>{
			return {
				title:it['title'],
				href: it['href']
			}
		});
	});
}

//download as CSV
function downloadAsCSV(data, titles){
	let csvContent = titles.join(',')+'\r\n';
	
    data.forEach(data => {
      let row = titles.map(t=>data[t]).join(',');
      csvContent += row + '\r\n';
    })
    let downLink = document.createElement('a');
    let blob = new Blob(["\ufeff", csvContent]);
    let urlObject = URL.createObjectURL(blob);
    downLink.setAttribute('href', urlObject);
    downLink.setAttribute('download', 'customer.csv');
    document.body.appendChild(downLink);
    downLink.click();
}