Lluís lluisagusti

Group Array of JavaScript Objects by Key or Property Value

Implementation

const groupBy = key => array =>
  array.reduce((objectsByKeyValue, obj) => {
    const value = obj[key];
    objectsByKeyValue[value] = (objectsByKeyValue[value] || []).concat(obj);
    return objectsByKeyValue;

	// Paste these lines into website's console (Win/Linux: Ctrl + Shift + I / Mac: Cmd + Alt + I)

	if(!!window.React \|\|
	!!document.querySelector('[data-reactroot], [data-reactid]') \|\|
	Array.from(document.querySelectorAll('*')).some(e => e._reactRootContainer !== undefined \|\| Object.keys(e).some(k => k.startsWith('__reactContainer')))
	)
	console.log('React.js');

	if(!!document.querySelector('script[id=__NEXT_DATA__]'))
	console.log('Next.js');