added chapter example code for chapter 4, also added package.json for readline-sync

Author: jwoolbright23

data-and-variables/chapter-examples/bruces-beard.js

@@ -0,0 +1 @@
+console.log('Bruce's beard');

data-and-variables/chapter-examples/critical-input-detail.js

@@ -0,0 +1,6 @@
+const input = require('readline-sync');
+
+let num1 = input.question("Enter a number: ");
+let num2 = input.question("Enter another number: ");
+
+console.log(num1 + num2);

data-and-variables/chapter-examples/more-on-numbers.js

@@ -0,0 +1,5 @@
+console.log(42000);
+console.log(42,000);
+
+console.log(42, 17, 56, 34, 11, 4.35, 32);
+console.log(3.4, "hello", 45);

data-and-variables/chapter-examples/more-on-strings.js

@@ -0,0 +1,5 @@
+console.log(typeof "17");
+console.log(typeof "3.2");
+
+console.log(typeof 'This is a string');
+console.log(typeof "And so is this");

data-and-variables/chapter-examples/package.json

@@ -0,0 +1,15 @@
+{
+  "name": "Dependencies for Chapter 4: Data and Variables",
+  "version": "1.0.0",
+  "description": "This package.json file includes all dependencies needed to run code within files contained in this directory",
+  "main": "index.js",
+  "dependencies": {
+    "readline-sync": "^1.4.10"
+  },
+  "scripts": {
+    "start": "node index.js"
+  },
+  "author": "John Woolbright",
+  "license": "ISC"
+}
+

data-and-variables/chapter-examples/readline-greeting-program.js

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+const input = require('readline-sync');
+
+let name = input.question("Enter your name: ");

data-and-variables/chapter-examples/readline-sync.js

@@ -0,0 +1,3 @@
+const input = require('readline-sync');
+
+let info = input.question("Question text... ");

data-and-variables/chapter-examples/type-conversion.js

@@ -0,0 +1,9 @@
+console.log(Number("2345"));
+console.log(typeof Number("2345"));
+console.log(Number(17));
+
+console.log(Number("23bottles"));
+
+console.log(String(17));
+console.log(String(123.45));
+console.log(typeof String(123.45));

data-and-variables/chapter-examples/type-of.js

@@ -0,0 +1,3 @@
+console.log(typeof "Hello, World!");
+console.log(typeof 17);
+console.log(typeof 3.14);