Upgrade dependencies to latest; update linting

Author: Cache Hamm

examples/01-hello-world.js

@@ -11,18 +11,18 @@
  */
 
 require('colors')
-let Engine = require('../dist').Engine
-let Rule = require('../dist').Rule
+const Engine = require('../dist').Engine
+const Rule = require('../dist').Rule
 
 /**
  * Setup a new engine
  */
-let engine = new Engine()
+const engine = new Engine()
 
 /**
  * Create a rule
  */
-let rule = new Rule({
+const rule = new Rule({
   // define the 'conditions' for when "hello world" should display
   conditions: {
     all: [{
@@ -48,7 +48,7 @@ engine.addRule(rule)
  * Fact values do NOT need to be known at engine runtime; see the
  * 03-dynamic-facts.js example for how to pull in data asynchronously during runtime
  */
-let facts = { displayMessage: true }
+const facts = { displayMessage: true }
 
 // run the engine
 engine

examples/02-nested-boolean-logic.js

@@ -11,12 +11,12 @@
  */
 
 require('colors')
-let Engine = require('../dist').Engine
+const Engine = require('../dist').Engine
 
 /**
  * Setup a new engine
  */
-let engine = new Engine()
+const engine = new Engine()
 
 // define a rule for detecting the player has exceeded foul limits.  Foul out any player who:
 // (has committed 5 fouls AND game is 40 minutes) OR (has committed 6 fouls AND game is 48 minutes)
@@ -56,7 +56,7 @@ engine.addRule({
  * define the facts
  * note: facts may be loaded asynchronously at runtime; see the advanced example below
  */
-let facts = {
+const facts = {
   personalFoulCount: 6,
   gameDuration: 40
 }

examples/03-dynamic-facts.js

@@ -12,22 +12,22 @@
  */
 
 require('colors')
-let Engine = require('../dist').Engine
+const Engine = require('../dist').Engine
 // example client for making asynchronous requests to an api, database, etc
-let apiClient = require('./support/account-api-client')
+const apiClient = require('./support/account-api-client')
 
 /**
  * Setup a new engine
  */
-let engine = new Engine()
+const engine = new Engine()
 
 /**
  * Rule for identifying microsoft employees taking pto on christmas
  *
  * the account-information fact returns:
  *  { company: 'XYZ', status: 'ABC', ptoDaysTaken: ['YYYY-MM-DD', 'YYYY-MM-DD'] }
  */
-let microsoftRule = {
+const microsoftRule = {
   conditions: {
     all: [{
       fact: 'account-information',
@@ -68,7 +68,7 @@ engine.addFact('account-information', function (params, almanac) {
 })
 
 // define fact(s) known at runtime
-let facts = { accountId: 'lincoln' }
+const facts = { accountId: 'lincoln' }
 engine
   .run(facts)
   .then(results => {

examples/04-fact-dependency.js

@@ -13,20 +13,20 @@
  */
 
 require('colors')
-let Engine = require('../dist').Engine
-let accountClient = require('./support/account-api-client')
+const Engine = require('../dist').Engine
+const accountClient = require('./support/account-api-client')
 
 /**
  * Setup a new engine
  */
-let engine = new Engine()
+const engine = new Engine()
 
 /**
  * Rule for identifying microsoft employees that have been terminated.
  * - Demonstrates re-using a same fact with different parameters
  * - Demonstrates calling a base fact, which serves to load data once and reuse later
  */
-let microsoftRule = {
+const microsoftRule = {
   conditions: {
     all: [{
       fact: 'account-information',
@@ -49,14 +49,14 @@ engine.addRule(microsoftRule)
  * - Demonstrates calling a base fact, also shared by the account-information-field fact
  * - Demonstrates performing computations on data retrieved by base fact
  */
-let tenureRule = {
+const tenureRule = {
   conditions: {
     all: [{
       fact: 'employee-tenure',
       operator: 'greaterThanInclusive',
       value: 5,
       params: {
-        'unit': 'years'
+        unit: 'years'
       }
     }]
   },
@@ -94,8 +94,8 @@ engine.addFact('account-information', (params, almanac) => {
 engine.addFact('employee-tenure', (params, almanac) => {
   return almanac.factValue('account-information')
     .then(accountInformation => {
-      let created = new Date(accountInformation.createdAt)
-      let now = new Date()
+      const created = new Date(accountInformation.createdAt)
+      const now = new Date()
       switch (params.unit) {
         case 'years':
           return now.getFullYear() - created.getFullYear()

examples/05-optimizing-runtime-with-fact-priorities.js

@@ -11,18 +11,18 @@
  */
 
 require('colors')
-let Engine = require('../dist').Engine
-let accountClient = require('./support/account-api-client')
+const Engine = require('../dist').Engine
+const accountClient = require('./support/account-api-client')
 
 /**
  * Setup a new engine
  */
-let engine = new Engine()
+const engine = new Engine()
 
 /**
  * - Demonstrates setting high performance (cpu) facts higher than low performing (network call) facts.
  */
-let microsoftRule = {
+const microsoftRule = {
   conditions: {
     all: [{
       fact: 'account-information',
@@ -41,7 +41,7 @@ engine.addRule(microsoftRule)
 /**
  * Register listeners with the engine for rule success and failure
  */
-let facts
+const facts = { accountId: 'washington' }
 engine
   .on('success', event => {
     console.log(facts.accountId + ' DID '.green + 'meet conditions for the ' + event.type.underline + ' rule.')
@@ -55,8 +55,8 @@ engine
  * Facts that do not have a priority set default to 1
  * @type {Integer} - Facts are run in priority from highest to lowest.
  */
-let HIGH = 100
-let LOW = 1
+const HIGH = 100
+const LOW = 1
 
 /**
  * 'account-information' fact executes an api call - network calls are expensive, so
@@ -82,7 +82,6 @@ engine.addFact('date', (params, almanac) => {
 }, { priority: HIGH })
 
 // define fact(s) known at runtime
-facts = { accountId: 'washington' }
 engine.run(facts).catch(console.log)
 
 /*

examples/06-custom-operators.js

@@ -17,12 +17,12 @@
  */
 
 require('colors')
-let Engine = require('../dist').Engine
+const Engine = require('../dist').Engine
 
 /**
  * Setup a new engine
  */
-let engine = new Engine()
+const engine = new Engine()
 
 /**
  * Define a 'startsWith' custom operator, for use in later rules
@@ -35,7 +35,7 @@ engine.addOperator('startsWith', (factValue, jsonValue) => {
 /**
  * Add rule for detecting words that start with 'a'
  */
-let ruleA = {
+const ruleA = {
   conditions: {
     all: [{
       fact: 'word',
@@ -52,7 +52,7 @@ engine.addRule(ruleA)
 /*
  * Add rule for detecting words that start with 'b'
  */
-let ruleB = {
+const ruleB = {
   conditions: {
     all: [{
       fact: 'word',
@@ -67,7 +67,7 @@ let ruleB = {
 engine.addRule(ruleB)
 
 // utility for printing output
-let printEventType = {
+const printEventType = {
   'start-with-a': 'start with "a"',
   'start-with-b': 'start with "b"'
 }

examples/07-rule-chaining.js

@@ -13,17 +13,17 @@
  */
 
 require('colors')
-let Engine = require('../dist').Engine
+const Engine = require('../dist').Engine
 
 /**
  * Setup a new engine
  */
-let engine = new Engine()
+const engine = new Engine()
 
 /**
  * Rule for identifying people who may like screwdrivers
  */
-let drinkRule = {
+const drinkRule = {
   conditions: {
     all: [{
       fact: 'drinksOrangeJuice',
@@ -51,7 +51,7 @@ engine.addRule(drinkRule)
  * - Only invite people who enjoy screw drivers
  * - Only invite people who are sociable
  */
-let inviteRule = {
+const inviteRule = {
   conditions: {
     all: [{
       fact: 'screwdriverAficionado', // this fact value is set when the drinkRule is evaluated

examples/08-fact-comparison.js

@@ -11,19 +11,19 @@
  */
 
 require('colors')
-let Engine = require('../dist').Engine
+const Engine = require('../dist').Engine
 
 /**
  * Setup a new engine
  */
-let engine = new Engine()
+const engine = new Engine()
 
 /**
  * Rule for determining if account has enough money to purchase a $50 gift card product
  *
  * customer-account-balance >= $50 gift card
  */
-let rule = {
+const rule = {
   conditions: {
     all: [{
       // extract 'balance' from the 'customer' account type
@@ -55,7 +55,7 @@ engine.addFact('account', (params, almanac) => {
   return almanac.factValue('accounts')
     .then(accounts => {
       // use "params" to filter down to the type specified, in this case the "customer" account
-      let customerAccount = accounts.filter(account => account.type === params.accountType)
+      const customerAccount = accounts.filter(account => account.type === params.accountType)
       // return the customerAccount object, which "path" will use to pull the "balance" property
       return customerAccount[0]
     })
@@ -66,7 +66,7 @@ engine.addFact('product', (params, almanac) => {
   return almanac.factValue('products')
     .then(products => {
       // use "params" to filter down to the product specified, in this case the "giftCard" product
-      let product = products.filter(product => product.productId === params.productId)
+      const product = products.filter(product => product.productId === params.productId)
       // return the product object, which "path" will use to pull the "price" property
       return product[0]
     })
@@ -85,7 +85,7 @@ engine
   })
 
 // define fact(s) known at runtime
-let productList = {
+const productList = {
   products: [
     {
       productId: 'giftCard',

examples/09-rule-results.js

@@ -10,12 +10,12 @@
  *   DEBUG=json-rules-engine node ./examples/09-rule-results.js
  */
 require('colors')
-let Engine = require('../dist').Engine
+const Engine = require('../dist').Engine
 
 /**
  * Setup a new engine
  */
-let engine = new Engine()
+const engine = new Engine()
 
 // rule for determining honor role student athletes (student has GPA >= 3.5 AND is an athlete)
 engine.addRule({
@@ -45,7 +45,7 @@ function render (message, ruleResult) {
     return console.log(`${message}`.green)
   }
   // if rule failed, iterate over each failed condition to determine why the student didn't qualify for athletics honor roll
-  let detail = ruleResult.conditions.all.filter(condition => !condition.result)
+  const detail = ruleResult.conditions.all.filter(condition => !condition.result)
     .map(condition => {
       switch (condition.operator) {
         case 'equal':

examples/support/account-api-client.js

@@ -2,7 +2,7 @@
 
 require('colors')
 
-let accountData = {
+const accountData = {
   washington: {
     company: 'microsoft',
     status: 'terminated',