ObjectFromArray.js

// create an object from an array of values with Array.reduce
const objectFromArray = [4,5,6].reduce((output, item, index) => {
		output[index] = item; // assign new key/value to output object
		return output;
	},
	{} // initial value - empty object
);

// objectFromArray:
// {0: 4, 1: 5, 2: 6}