NodeJS commands and Javascript snippets

filterSample.js

function isUserFromPortalFilter(portal) {
  return function (user) {
    return user.portal === portal;
  };
}

// Usage
var portalXUsers = users.filter(isUserFromPortal('portalX'));

forEachAsync.js

function forEach(array, asyncAction, callback) {
  var promises = [];
  array.forEach(function (item) {
    promises.push(new Promise(function (resolve, reject) {
      asyncAction(item, resolve);
    }));
  });

  Promise.all(promises)
    .then(function () {
      return callback();
    }).catch(function (err) {
      throw err;
    });
}

ForEachAsyncWithoutPromises.js

function forEach(array, asyncAction, callback) {
  var size = array.length;
  var count = 0;
  var nextLoop = true;

  array.forEach(function (item) {
    if (nextLoop == true) {
      asyncAction(item, function (err) {
        if (err) {
          nextLoop = false;
          return callback(err);
        } else {
          if (++count === size) {
            return callback();
          }
        }
      });
    }
  });
}

mocha@VSCode.js

.vscode > launch.js

{
  "name": "Run mocha tests",
  "type": "node",
  "program": "${workspaceRoot}/node_modules/mocha/bin/_mocha",
  "stopOnEntry": false,
  "args": [],
  "cwd": "${workspaceRoot}",
  "runtimeExecutable": null,
  "env": { "NODE_ENV": "development"}
}

NodeJS.js

// Starts a NodeJS application
node app.js

// Init the package.json file
npm init

// Install a node package in global mode
npm install <module_name> [-g|--global]

// Install a node package and save
npm i <module_name> [-S|--save]

// Install a node package and save as a dev dependency
npm i <module_name> [-D|--save-dev]