nattatorn-dev

// fetch api 
{
  posts: [
    {
      id: 88,
      content: 'North Korea News',
      author: {
        id: 41,
        name: 'Kim Jong-un',
      },

nattatorn-dev

/** all pure func avoid push, pop, shift, unshift, sort, reverse, splice and delete */

/**
   * @param  {[array]}        array           | ['USD', 'JPY', 'GBP'] |
   * @param  {[number]}       index           | 0 |
   * @return {[array]}        array           | ['JPY', 'GBP'] | delete element of array by index and return new array
   */
const deleteByIndex = ( array, index ) =>
  array.slice( 0, index ).concat( array.slice( index + 1 ) )

nattatorn-dev

Head & Tail
Destructuring syntax allows us to get the head and tail of a list without utility functions.

_.head([1, 2, 3]);
// 1
_.tail([1, 2, 3]);
// [2, 3]

// becomes