ES2015 Snippets

array_functions.js

const createRange = (start, amount) =>
    Array.from(Array(amount), (_, idx) => start + idx);

/**
 * @param {array} array 
 */
const uniqueArray = array => [...new Set(array)];

/**
 * @param {array} array 
 * @param {string} key Should not repeat in array or only last one will be in resulting object
 */
const arrayToObject = (array, groupKey) =>
    Object.assign({}, ...array.map(item => ({ [item[groupKey]]: item })));

other.md

Other usefull snippets