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Promise Error Handling

• Errors can be handled in a synchronouse fashion
• You can throw an exception in a Promise
• You can reject a promise with an exception
• You can catch an exception with Promise catch

Throwing and Rejecting Errors

Example 1: Throwing an Error

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function log(value, label = "-") {
  console.log(" ");
  console.log(" ");
  console.log(label, JSON.stringify(value, null, " "));
}

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# Run Chrome as IE11
"C:\Program Files (x86)\Google\Chrome\Application\chrome.exe" --user-agent="Mozilla/5.0 (Windows NT 6.1; WOW64; Trident/7.0; Ypkch32; rv:11.0) like Gecko"

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// Based on material css

.container {
    margin: 0 auto;
    .row {
      margin-left: -4px;
      margin-right: -4px;
    }
  }
  .row {

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// the first five are the G5 currencies. The whole lot are the G10
const currencies = ["EUR", "GBP", "YEN", "USD", "CHF", "AUD", "CAD", "NZD", "NOK", "SEK"];

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Single Responsibility

Applies to everything: components, services, directives, etc.

Rule of One

• One thing per file
• Max 400 lines of code per file

Small Functions

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cat test-file.js | grep "\(it(\|describe(\)"

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find . -type f -print0 | xargs -0 grep -l "needle"

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const fs = require("fs");
const path = require("path");

const PATH = "."

function listDirs(files) {
  files.forEach(file => {
    fs.stat(path.join(PATH, file), (err, stats) => {
      if (stats.isDirectory()) {
        console.log(file);

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# Unix find documentation: https://kb.iu.edu/d/admm

# Remove all node_modules that were modified 60 days or earlier (to free up disc space)
find ./* -maxdepth 1 -path '*node_modules*' -type d -mtime +60 -exec rm -rf {} \;

# Show all directories containing node_modules that were modified 60 days or earlier
find ./* -maxdepth 1 -path '*node_modules*' -type d -mtime +60 -print

# Run this script where all the checked out projects are.
find . -maxdepth 2 -type d -ctime +60 -name node_modules | grep -vE "(node-deploy|node-release|stash-client|kibana-dashboards|package-manager)" | xargs rm -rf