jhurliman

These instructions will allow you to write and run one-off node.js scripts using modern ECMAScript syntax, including async/await.

1. Install Babel globally

npm install -g babel-cli

2. Add a .babelrc file to the folder holding your code containing the following:

{ "presets": [ "es2015", "stage-3" ] }

jhurliman

import PromisePool from 'es6-promise-pool'

/**
 * Like Array.map() but supports promises and concurrency limiting.
 * @param {array} array - Input array to map.
 * @param {function} asyncFn(currentValue, index, array) - Called once for each
 *   value in the array.
 * @param {number} [concurrencyLimit] - Optional cap on the number of
 *   asynchronous methods to execute at once.
 * @returns {array} An array containing the mapped output values.

jhurliman

curl -silent https://news.ycombinator.com/rss | grep -no '<item><title>[^<]*' | sed 's/<item><title>//'

jhurliman

import * as math from 'mathjs'

const MINUTES_PER_DAY = 1440
const REFRESH_MINUTES = 1
const HASH_BUCKETS = MINUTES_PER_DAY / REFRESH_MINUTES

const MAX_IDS = 291554

main()

jhurliman

/**
 * Based on code from <https://github.com/petkaantonov/bluebird/wiki/Optimization-killers>
 * Run this script using:
 *   `node --allow-natives-syntax optimization-test.js`
 * For more diagnostic output use:
 *   `node --trace_opt --trace_deopt --allow-natives-syntax optimization-test.js`
 */

function myFunction() {
  return 'hello world';

jhurliman

function uuid() {
  var bytes = require('crypto').randomBytes(16);
  bytes[6] = (bytes[6] & 0x0f) | 0x40;
  bytes[8] = (bytes[8] & 0x3f) | 0x80;
  var str = bytes.toString('hex');
  return str.substr(0,  8) + '-' +
         str.substr(8,  4) + '-' +
         str.substr(12, 4) + '-' +
         str.substr(16, 4) + '-' +
         str.substr(20, 12);

jhurliman

var P = require('bluebird');
var request = P.promisify(require('request'));
P.promisifyAll(request);

exports.currentInstanceInfo = currentInstanceInfo;

var INSTANCE_BASE_URL = 'http://169.254.169.254/2014-11-05/';

currentInstanceInfo().then(res => console.dir(res));

jhurliman

# source /usr/local/etc/bash_completion.d/git-prompt.sh
PROMPT_COMMAND=__generate_prompt

__generate_prompt() {
# Undocumented function that updates OS X Terminal\'s knowledge of
# the current
# working directory. Required for Cmd + T to open a new tab in the same
# directory.
#
# See '/etc/bashrc' on an OS X box for details.

jhurliman

jhurliman

var P = require('bluebird');

P.resolve().then(function () {
  // Change this to throw new Error to get the expected behavior
  if (true) return new Error('Returned error');
  return { key: { subKey: 'test' } };
}).then(function (obj) {
  // This will crash if return new Error is used since the Error is not caught by bluebird
  console.log('obj.key.subKey = %s', obj.key.subKey);
}).catch(function (err) {