add video demos

Author: paladique

Arrays_Demos/array_methods.js

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+let arr1 = ["A", true, 2];
+
+//Push and pop
+console.log("\n********Push and pop********\n");
+console.log(arr1.push("new value"));
+console.log(arr1);
+console.log(arr1.pop()); //Remove last value
+console.log(arr1);
+
+//Shift and unshift
+console.log("\n********Shift and unshift********\n");
+console.log(arr1.unshift("new value"));
+console.log(arr1);
+console.log(arr1.shift()); //Remove first value
+console.log(arr1);
+
+//Concat
+console.log("\n********Concat********\n");
+let arr2 = ["B", false, 3];
+let newArr = arr1.concat(arr2);
+let newArr2 = arr2.concat([1,2,3]);
+console.log(newArr);
+console.log(newArr2);
+

Arrays_Demos/create_arrays.js

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+//Creating an array
+console.log("\n********Creating an array********\n");
+
+let arrayLength = 5;
+let arr1 = [];
+let arr2 = Array(arrayLength);
+
+//Getting array length
+console.log("\n********Getting array length********\n");
+
+console.log(arr1.length);
+console.log(arr2.length);

Arrays_Demos/populating_arrays.js

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+//Adding data during creation
+console.log("\n********Adding data during creation********\n");
+let arr1 = ["A", true, 2];
+console.log(arr1[0]);
+console.log(arr1[1]);
+
+//Adding data after creation
+console.log("\n********Adding data after creation********\n");
+let arrayLength = 2;
+let arr2 = Array(arrayLength);
+arr2[0] = "Value at index 0";
+console.log(arr2[0]);
+console.log(arr2[1]); //No value present at index
+
+//Length and index
+console.log("\n********Length and index********\n");
+
+console.log(arr1.length);
+console.log(arr1[3]); //Doesn't exist
+console.log(arr1[2]); //Last index of array
+console.log(arr1[arr1.length - 1]); //Equals 2
+
+console.log("\n********Length and index Part 2********\n");
+let arr3 = Array(3); //Empty array of length 3
+arr3[2] = "Adding a value!";
+console.log(arr3[2]); //Last index of array 
+console.log(arr3[arr3.length - 1]); //Index: 2
+console.log(arr3[0]); //No value yet
+console.log(arr3[1]); //No value yet

Errors_Demos/Errors_trycatchfinally.js

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+function criticalCode() {
+    throw "throwing an exception";
+}
+
+function logError(theException) {
+    console.log(theException);
+}
+
+//Throwing Exceptions
+console.log("\n********Throwing Exceptions********\n");
+
+throw 'myException';
+throw true;
+
+//Try..Catch
+console.log("\n********Try..Catch********\n");
+
+try {
+    criticalCode();
+} catch (ex) {
+    console.log("Got an error");
+    logError(ex);
+}
+
+//Throwing in Try..Catch
+console.log("\n********Throwing in Try..Catch********\n");
+
+try {
+    throw "An exception that is thrown every time";
+
+} catch (ex) {
+    console.log("Got an error");
+    logError(ex);
+}
+
+//Try..Catch..Finally
+console.log("\n********Try..Catch..Finally********\n");
+
+try {
+    criticalCode();
+} catch (ex) {
+    console.log("Got an error");
+    logError(ex);
+} finally {
+    console.log("Code that always will run");
+}

Numbers_Demos/numbers_conversions.js

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+let num1 = '150';
+let flo1 = '1.50';
+
+console.log("********Converting strings to integers********");
+//Converting strings to integers
+console.log(parseInt('100'));
+console.log(parseInt(num1));
+console.log(parseInt('ABC'));
+console.log(parseInt('0xF')); //Hexadecimal number
+
+console.log("********Converting strings to float********");
+//Converting strings to float
+console.log(parseFloat('1.00'));
+console.log(parseFloat(flo1));
+console.log(parseFloat('ABC'));
+
+console.log("********More Conversion Examples********");
+//More Conversion Examples
+//Numbers after special characters are ignored
+console.log(parseInt('1.5')); 
+console.log(parseInt('1 + 1'));
+
+//Using Template Literals
+console.log(parseInt(`${1 + 1}`));
+
+console.log("********Converting numbers to strings********");
+//Converting numbers to strings
+console.log(num1.toString());
+console.log(flo1.toString());
+console.log((100).toString());

Numbers_Demos/numbers_performingmath.js

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+let num1 = 100;
+
+//Basic Math
+console.log("********Basic Math********");
+console.log(num1 + 25);
+console.log(num1 - 100);
+console.log(num1 * 100);
+console.log(num1 / 1500);
+
+console.log("********Additional Mathematical Operations********");
+//Additional Mathematical Operations
+console.log(num1 % 1500); // Remainder
+console.log(++num1); //Increment
+console.log(--num1); //Decrement
+
+console.log("********Using the Math Object********");
+//Using the Math Object
+console.log(Math.PI); //Pi 
+console.log(Math.sqrt(num1)); //Square root

Strings_Demos/strings_concatenation.js

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+let str1 = "Hello";
+let str2 = "World!";
+
+//Using the + operator
+console.log("********Using the + operator********\n");
+console.log(str1 + str2);
+console.log(str1 + "Big" + str2);
+
+console.log("\n********Adding Spacing********\n");
+//Adding Spacing
+str1 = "Hello ";
+
+console.log(str1 + str2);
+console.log(str1 + "Big " + str2)
+
+console.log("\n********Be careful with numbers!********\n");
+//Be careful with numbers!
+let num1 = 1;
+let num2 = "1";
+
+console.log(num1 + num2);
+console.log(num1 + 1);

Strings_Demos/strings_templateliterals.js

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+//Concatenation with template literals
+console.log("\n********Concatenation with template literals********\n");
+
+let str1 = "JavaScript";
+let str2 = "fun";
+
+console.log(`I am writing code in ${str1}`);
+console.log(`Formatting in ${str1} is ${str2}!`);
+
+//Expressions in template literals
+console.log("\n********Expressions in template literals********\n");
+
+let bool1 = true;
+console.log(`1 + 1 is ${1 + 1}`);
+console.log(`The opposite of true is ${!bool1}
+
+`)