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loianeloiane
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added new examples
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‎chapter01/02-Variables.js

+26-4
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@@ -8,8 +8,30 @@ var nullVar = null; //{6}
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var und; //7
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console.log("num: "+ num);
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console.log("name: "+ num);
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console.log("trueValue: "+ num);
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console.log("price: "+ num);
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console.log("name: "+ name);
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console.log("trueValue: "+ trueValue);
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console.log("price: "+ price);
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console.log("nullVar: "+ nullVar);
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console.log("und: "+ und);
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console.log("und: "+ und);
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//******* Variable Scope
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var myVariable = 'global';
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myOtherVariable = 'global';
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function myFunction(){
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var myVariable = 'local';
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return myVariable;
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}
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function myOtherFunction(){
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myOtherVariable = 'local';
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return myOtherVariable;
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}
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console.log(myVariable); //{1}
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console.log(myFunction()); //{2}
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console.log(myOtherVariable); //{3}
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console.log(myOtherFunction()); //{4}
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console.log(myOtherVariable); //{5}

‎chapter01/03-Operators.js

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@@ -42,8 +42,27 @@ console.log('num < 1 : ' + (num < 1));
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console.log('num >= 1 : ' + (num >= 1));
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console.log('num <= 1 : ' + (num <= 1));
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/* Logical operators */
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console.log('true && false : ' + (true && false));
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console.log('true || false : ' + (true || false));
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console.log('!true : ' + (!true));
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console.log('!true : ' + (!true));
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/* Bitwise operators */
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console.log('5 & 1:', (5 & 1)); //same as 0101 & 0001 (result 0001 / 1)
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console.log('5 | 1:', (5 | 1)); //same as 0101 | 0001 (result 0101 / 5)
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console.log('~ 5:', (~5)); //same as ~0101 (result 1010 / 10)
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console.log('5 ^ 1:', (5 ^ 1)); //same as 0101 ^ 0001 (result 0100 / 4)
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console.log('5 << 1:', (5 << 1)); //same as 0101 << 1 (result 1010 / 10)
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console.log('5 >> 1:', (5 >> 1)); //same as 0101 >> 1 (result 0010 / 2)
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/* typeOf */
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console.log('typeof num:', typeof num);
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console.log('typeof Packt:', typeof 'Packt');
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console.log('typeof true:', typeof true);
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console.log('typeof [1,2,3]:', typeof [1,2,3]);
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console.log('typeof {name:John}:', typeof {name:'John'});
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/* delete */
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var myObj = {name: 'John', age: 21};
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delete myObj.age;
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console.log(myObj); //Object {name: "John"}

‎chapter01/04-TruthyFalsy.html

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<!DOCTYPE html>
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<html>
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<head>
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<meta charset="UTF-8">
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<title></title>
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</head>
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<body>
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<script type="text/javascript" src="04-TruthyFalsy.js"></script>
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</body>
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</html>

‎chapter01/04-TruthyFalsy.js

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function testTruthy(val){
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return val ? console.log('truthy') : console.log('falsy');
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}
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testTruthy(true); //true
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testTruthy(false); //false
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testTruthy(new Boolean(false)); //true (object is always true)
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testTruthy(''); //false
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testTruthy('Packt'); //true
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testTruthy(new String('')); //true (object is always true)
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testTruthy(1); //true
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testTruthy(-1); //true
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testTruthy(NaN); //false
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testTruthy(new Number(NaN)); //true (object is always true)
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testTruthy({}); //true (object is always true)
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var obj = {name:'John'};
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testTruthy(obj); //true
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testTruthy(obj.name); //true
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testTruthy(obj.age); //age (prop does not exist)

‎chapter01/05-EqualsOperators.html

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<!DOCTYPE html>
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<html>
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<head>
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<meta charset="UTF-8">
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<title></title>
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</head>
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<body>
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<script type="text/javascript" src="05-EqualsOperators.js"></script>
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</body>
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</html>

‎chapter01/05-EqualsOperators.js

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//Packt == true
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console.log('packt' ? true : false);
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//outputs true
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console.log('packt' == true);
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//1 - converts Boolean using toNumber
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//'packt' == 1
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//2 - converts String using toNumber
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//NaN == 1
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//outputs false
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console.log('packt' == false);
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//1 - converts Boolean using toNumber
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//'packt' == 0
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//2 - converts String using toNumber
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//NaN == 0
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//outputs false
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console.log([0] == true);
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//1 - converts Boolean using toNumber
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//[0] == 1
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//2 - converts Object using toPrimitive
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//2.1 - [0].valueOf() is not primitive
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//2.2 - [0].toString is 0
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//0 == 1
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//outputs false
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//******************************* ===
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console.log('packt' === true); //false
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console.log('packt' === 'packt'); //true
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var person1 = {name:'John'};
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var person2 = {name:'John'};
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console.log(person1 === person2); //false, different objects

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