reorganizing

Chapter 02/Code Samples/ch2_boolean_and_comparison.js

@@ -0,0 +1,11 @@
+let bool1 = false;
+let bool2 = true;
+console.log(typeof bool1)
+
+let str1 = "JavaScript is fun!";
+let str2 = "JavaScript is fun!";
+console.log("These two strings are the same:", str1 === str2);
+
+let sym1 = Symbol("JavaScript is fun!");
+let sym2 = Symbol("JavaScript is fun!");
+console.log("These two Symbols are the same:", sym1 === sym2);

Chapter 02/Code Samples/ch2_calculations_conversions.js

@@ -0,0 +1,43 @@
+// let nr1 = 2;
+// let nr2 = "2";
+// console.log(nr1 * nr2);
+
+// let nr1 = 2;
+// let nr2 = "2";
+// console.log(nr1 + nr2);
+
+// let nrToStr = 6;
+// nrToStr = String(nrToStr);
+// console.log(nrToStr, typeof nrToStr);
+
+// let strToNr = "12";
+// strToNr = Number(strToNr);
+// console.log(strToNr, typeof strToNr);
+
+// let strToBool = "any string will return true";
+// strToBool = Boolean(strToBool);
+// console.log(strToBool, typeof strToBool);
+
+// let nullToNr = null;
+// nullToNr = Number(nullToNr);
+// console.log("null", nullToNr, typeof nullToNr);
+
+// let strToNr = "";
+// strToNr = Number(strToNr);
+// console.log("empty string", strToNr, typeof strToNr);
+
+// let strToNr2 = "hello";
+// strToNr2 = Number(strToNr2);
+// console.log(strToNr2, typeof strToNr2);
+
+// let strToBool = "";
+// strToBool = Boolean(strToBool);
+// console.log(strToBool, typeof strToBool);
+
+// let strToBool2 = "false";
+// strToBool2 = Boolean(strToBool2);
+// console.log(strToBool2, typeof strToBool2);
+
+// let nr1 = 2;
+// let nr2 = "2";
+// console.log(nr1 + Number(nr2));

Chapter 02/Code Samples/ch2_strings_and_types.js

@@ -0,0 +1,25 @@
+let str = "Hello, what's your name? Is it \"Mike\"?";
+console.log(str);
+let str2 = 'Hello, what\'s your name? Is it "Mike"?';
+console.log(str2);
+
+let str3 = "New \nline."
+let str4 = "I'm containing a backslash: \\!";
+console.log(str3);
+console.log(str4);
+
+let str = "Hello";
+let nr = 7;
+let bigNr = 12345678901234n;
+let bool = true;
+let sym = Symbol("unique");
+let undef = undefined;
+let unknown = null;
+
+console.log("str", typeof str);
+console.log("nr", typeof nr);
+console.log("bigNr", typeof bigNr);
+console.log("bool", typeof bool);
+console.log("sym", typeof sym);
+console.log("undef", typeof undef);
+console.log("unknown", typeof unknown);

Chapter 02/Code Samples/ch2_types_and_operations.js

@@ -0,0 +1,64 @@
+// let nr1 = 12;
+// let nr2 = 14;
+// let str1 = "Hello ";
+// let str2 = "addition";
+// let result1 = nr1 + nr2;
+// let result2 = str1 + str2;
+// console.log(result1, result2);
+
+// let nr1 = 20;
+// let nr2 = 4;
+// let str1 = "Hi ";
+// let nr3 = 3;
+// let result1 = nr1 - nr2;
+// let result2 = str1 - nr3;
+// console.log(result1, result2);
+
+// let nr1 = 15;
+// let nr2 = 10;
+// let str1 = "Hi";
+// let nr3 = 3;
+// let result1 = nr1 * nr2;
+// let result2 = str1 * nr3;
+// console.log(result1, result2);
+
+// let nr1 = 30;
+// let nr2 = 5;
+// let result1 = nr1 / nr2;
+// console.log(result1);
+
+// let nr1 = 2;
+// let nr2 = 3;
+// let result1 = nr1 ** nr2;
+// console.log(result1);
+
+// let nr1 = 10;
+// let nr2 = 3;
+// let result1 = nr1 % nr2;
+// console.log(`${nr1} % ${nr2} = ${result1}`);
+
+// let nr3 = 8;
+// let nr4 = 2;
+// let result2 = nr3 % nr4;
+// console.log(`${nr3} % ${nr4} = ${result2}`);
+
+// let nr5 = 15;
+// let nr6 = 4;
+// let result3 = nr5 % nr6;
+// console.log(`${nr5} % ${nr6} = ${result3}`);
+
+// let nr = 4;
+// nr++;
+// console.log(nr);
+
+// let nr = 2;
+// console.log(nr++);
+// console.log(nr);
+
+// let nr = 2;
+// console.log(++nr);
+
+let nr1 = 4;
+let nr2 = 5;
+let nr3 = 2;
+console.log(nr1++ + ++nr2 * nr3++);

Chapter 02/Code Samples/ch2_undefined_null.js

@@ -0,0 +1,11 @@
+let unassigned;
+console.log(unassigned);
+
+let terribleThingToDo = undefined;
+let lastname;
+console.log("Same undefined:", lastname === terribleThingToDo);
+
+let betterOption = null;
+console.log("Same null:", lastname === betterOption);
+
+let empty = null;

Chapter 02/Code Samples/ch2_variables_basics.js

@@ -0,0 +1,10 @@
+let firstname = "Maria";
+firstname = "Jacky";
+
+let nr1 = 12;
+var nr2 = 8;
+const pi = 3.14159;
+
+// throws a TypeError
+const someConstant = 3;
+someConstant = 4;

Chapter 02/Code Samples/ch2_variables_number.js

@@ -0,0 +1,7 @@
+let intNr = 1;
+let decNr = 1.5;
+let expNr = 1.4e15;
+
+let bigNr = 90071992547409920n;
+// typeError
+let result = bigNr + intNr;

Chapter 02/Code Samples/ch2_variables_string.js

@@ -0,0 +1,6 @@
+let singleString = 'Hi there!';
+let doubleString = "How are you?";
+
+let language = "JavaScript";
+let message = `Let's learn ${language}`;
+console.log(message);