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/**
 * Traverse permutation to add new letter to every new position
 * 
 * @example
 * generateNextPermutation(['a','b'],'c')
 * // => [['c','a','b'],['a','c','b'],['a','b','c']]
 */
function generateNextPermutation(permutation, ch) {
  const destination = [];
  for (let i = 0; i <= permutation.length; i++) {

Beraliv

import { filterT, map, mapT, pipeT, takeT, transduce, where } from 'nanoutils';

const isEven = value => value % 2 === 0;

const filterPredicates = {
  name: ({ author }) => name => author === undefined || name === author,
  timestamp: ({ from, to }) => timestamp =>
    from === undefined ||
    to === undefined ||
    (from <= timestamp && timestamp <= to)

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function debugT() {
  return function(reducer) {
    return function(acc, v) {
      debugger;
      return reducer(acc, v);
    };
  };
}

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function consoleT() {
  return function(reducer) {
    return function(acc, v) {
      console.log(acc, v);
      return reducer(acc, v);
    };
  };
}

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import { add, filterT, mapT, pipeT, transduce } from 'nanoutils';

const isEven = value => value % 2 === 0;

const transducers = array => {
  const transducer = pipeT(
    // transforms value to value + 1
    mapT(add(1)),
    // ignores odd values
    filterT(isEven),

Beraliv

const isEven = value => value % 2 === 0;

const filterPredicates = {
  // if available, checks if names equal
  author: ({ name }, { author }) => author === undefined || name === author,
  // if available, checks if date starts from a specified value
  from: ({ timestamp }, { from }) => from === undefined || from <= timestamp,
  // if available, checks if date ends with a specified value
  to: ({ timestamp }, { to }) => to === undefined || timestamp <= to
};

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const isEven = value => value % 2 === 0;

const isFilteredAuthor = ({ name }, { author }) => {
  // if filter is not available, value is not filtered
  if (author === undefined) {
    return true;
  }
  // checks if names equal
  return name === author;
};

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const isEven = value => value % 2 === 0;

const coreJs = array => {
  // starts from 0
  let sum = 0;
  // iterates over array
  for (let i = 0; i < array.length; i++) {
    // transforms value to value + 1
    const result = array[i] + 1;
    // ignores odd values

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const isEven = value => value % 2 === 0;

const mapFilterReduce = array =>
  // gets values from array
  array
    // transforms value to value + 1
    .map(value => value + 1)
    // ignores odd values
    .filter(isEven)
    // applies addition

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Tutorial: Designing a GraphQL API

This tutorial was created by Shopify for internal purposes. We've created a public version of it since we think it's useful to anyone creating a GraphQL API.

It's based on lessons learned from creating and evolving production schemas at Shopify over almost 3 years. The tutorial has evolved and will continue to change in the future so nothing is set in stone.