francisrstokes

class HashTable {
  constructor(bucketSize = 1024) {
    this._bucketSize = bucketSize;
    this._data = new Array(bucketSize);
  }

  hashKey(key) {
    const h = JSON.stringify(key, Object.keys(key).sort())
      .split('')
      .reduce((acc, cur, i) => acc + cur.charCodeAt(0) * (i+1), 0);

francisrstokes

const promiseCache = (promFn) => {
  let cachedPromise = promFn();
  return (refreshCache = false) => {
    if (refreshCache) cachedPromise = promFn();
    return cachedPromise;
  }
}

// Pass a function that generates a promise instead of the promise, so it can be refreshed
const cachedPromise = promiseCache(() => Promise.resolve(Math.random()));

francisrstokes

const validUnits = ['km', 'm', 'cm', 'mm', 'in', 'ft', 'mile'];

const isLengthObj = (lo) =>
  '_val' in lo &&
  '_unit' in lo &&
  typeof lo._val === 'number' &&
  typeof lo._unit === 'string' &&
  validUnits.includes(lo._unit);

const formatUnit = (unit, val) => {

francisrstokes

const daggy = require('daggy');
const {identity} = require('ramda');

const Either = daggy.taggedSum('Either', {
  Left: ['__value'],
  Right: ['__value'],
});

Either.of = Either.Right;