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FCC-js-tutorial-part-01.js
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FCC-js-tutorial-part-01.js
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//1.1 Comment Your JavaScript Code
// This is an in-line comment.
/* This is a
multi-line comment */
//1.2 Declare JavaScript Variables
var myName;
//1.3 Storing Values with the Assignment Operator
var a;
a = 7;
//1.4 Assigning the Value of One Variable to Another
var a;
a = 7;
var b;
b = a;
//1.5 Initializing Variables with the Assignment Operator
var a = 9;
//1.6 Understanding Uninitialized Variables
var a = 5;
var b = 10;
var c = "I am a";
a = a + 1;
b = b + 5;
c = c + " String!";
//1.7 Understanding Case Sensitivity in Variables
var studlyCapVar;
var properCamelCase;
var titleCaseOver;
studlyCapVar = 10;
properCamelCase = "A String";
titleCaseOver = 9000;
//1.8 Add Two Numbers with JavaScript
var sum = 10 + 10;
//1.9 Subtract One Number from Another with JavaScript
var difference = 45 - 33;
//1.10 Multiply Two Numbers with JavaScript
var product = 8 * 10;
//1.11 Divide One Number by Another with JavaScript
var quotient = 66 / 33;
//1.12 Increment a Number with JavaScript
var myVar = 87;
myVar = myVar++;
//1.13 Decrement a Number with JavaScript
var myVar = 11;
myVar--;
//1.14 Create Decimal Numbers with JavaScript
var ourDecimal = 5.7;
var myDecimal = 5.7;
//1.15 Multiply Two Decimals with JavaScript
var product = 2.0 * 2.5;
//1.16 Divide One Decimal by Another with JavaScript
var quotient = 4.4 / 2.0;
//1.17 Finding a Remainder in JavaScript
var remainder;
remainder = 11 % 3;
//1.18 Compound Assignment With Augmented Addition
var a = 3;
var b = 17;
var c = 12;
a += 12;
b += 9;
c += 7;
//1.19 Compound Assignment With Augmented Subtraction
var a = 11;
var b = 9;
var c = 3;
a -= 6;
b -= 15;
c -= 1;
//1.20 Compound Assignment With Augmented Multiplication
var a = 5;
var b = 12;
var c = 4.6;
a *= 5;
b *= 3;
c *= 10;
//1.21 Compound Assignment With Augmented Division
var a = 48;
var b = 108;
var c = 33;
a /= 12;
b /= 4;
c /= 11;
//1.22 Declare String Variables
var myFirstName = "Brendan";
var myLastName = "Eich";
//1.23 Escaping Literal Quotes in Strings
var myStr = "I am a \"double quoted\" string inside \"double quotes\".";
//1.24 Quoting Strings with Single Quotes
var myStr = '<a href="http://www.example.com" target="_blank">Link</a>';
//1.25 Escape Sequences in Strings
var myStr = "FirstLine\n\t\\SecondLine\nThirdLine"
//1.26 Concatenating Strings with Plus Operator
var myStr = "This is the start. " + "This is the end.";
//1.27 Concatenating Strings with the Plus Equals Operator
var myStr = "This is the first sentence. ";
myStr += "This is the second sentence.";
//1.28 Constructing Strings with Variables
var myName = "Brendan";
var myStr = "My name is " + myName + " and I am well!";
//1.29 Appending Variables to Strings
var someAdjective = "fun";
var myStr = "Learning to code is ";
myStr += someAdjective;
//1.30 Find the Length of a String
var lastNameLength = 0;
var lastName = "Lovelace";
lastNameLength = lastName.length;
//1.31 Use Bracket Notation to Find the First Character in a String
var firstLetterOfLastName = "";
var lastName = "Lovelace";
firstLetterOfLastName = lastName[0];
//1.32 Understand String Immutability
var myStr = "Jello World";
myStr = "Hello World";
//1.33 Use Bracket Notation to Find the Nth Character in a String
var lastName = "Lovelace";
var thirdLetterOfLastName = lastName[2];
//1.34 Use Bracket Notation to Find the Last Character in a String
var lastName = "Lovelace";
var lastLetterOfLastName = lastName[lastName.length - 1];
//1.35 Use Bracket Notation to Find the Nth-to-Last Character in a String
var lastName = "Lovelace";
var secondToLastLetterOfLastName = lastName[lastName.length - 2];
//1.36 Word Blanks
var myNoun = "dog";
var myAdjective = "big";
var myVerb = "ran";
var myAdverb = "quickly";
var wordBlanks = myNoun + " " + myAdjective + " " + myVerb + " " + myAdverb; // Change this line
//1.37 Store Multiple Values in one Variable using JavaScript Arrays
var myArray = ['one', 1];
//1.38 Nest one Array within Another Array
var myArray = [["Bulldogs", 23], ["Eels", 45]]
//1.39 Access Array Data with Indexes
var myArray = [50, 60, 70];
var myData = myArray[0];
//1.40 Modify Array Data With Indexes
var myArray = [18, 64, 99];
myArray[0] = 45;
//1.41 Access Multi-Dimensional Arrays With Indexes
var myArray = [[1, 2, 3], [4, 5, 6], [7, 8, 9], [[10, 11, 12], 13, 14]];
var myData = myArray[2][1];
//1.42 Manipulate Arrays With push()
var myArray = [["John", 23], ["cat", 2]];
myArray.push(["dog", 3])
//1.43 Manipulate Arrays With pop()
var myArray = [["John", 23], ["cat", 2]];
var removedFromMyArray = myArray.pop();
//1.44 Manipulate Arrays With shift()
var myArray = [["John", 23], ["dog", 3]];
var removedFromMyArray = myArray.shift();
//1.45 Manipulate Arrays With unshift()
var myArray = [["John", 23], ["dog", 3]];
myArray.shift();
myArray.unshift(["Paul", 35]);
//1.46 Shopping List
var myList = [
["Chocolate 1", 15],
["Chocolate 2", 15],
["Chocolate 3", 15],
["Chocolate 4", 15],
["Chocolate 5", 15]
];
//1.47 Write Reusable JavaScript with Functions
function reusableFunction() {
console.log("Hi World");
}
reusableFunction();
//1.48 Passing Values to Functions with Arguments
function functionWithArgs(param1, param2) {
console.log(param1 + param2);
}
functionWithArgs(1, 2);
//1.49 Global Scope and Functions
// Declare the myGlobal variable below this line
var myGlobal = 10;
function fun1() {
// Assign 5 to oopsGlobal Here
oopsGlobal = 5;
}
function fun2() {
var output = "";
if (typeof myGlobal != "undefined") {
output += "myGlobal: " + myGlobal;
}
if (typeof oopsGlobal != "undefined") {
output += " oopsGlobal: " + oopsGlobal;
}
console.log(output);
}
//1.50 Local Scope and Functions
function myLocalScope() {
'use strict';
var myVar;
console.log('inside myLocalScope', myVar);
}
myLocalScope();
console.log('outside myLocalScope', myVar);
//1.51 Global vs. Local Scope in Functions
var outerWear = "T-Shirt";
function myOutfit() {
var outerWear = "sweater";
return outerWear;
}
myOutfit();
//1.52 Return a Value from a Function with Return
function timesFive(num) {
return num * 5;
}
var answer = timesFive(5);
//1.53 Understanding Undefined Value returned from a Function
var sum = 0;
function addThree() {
sum = sum + 3;
}
function addFive() {
sum = sum + 5;
}
addThree();
addFive();
//1.54 Assignment with a Returned Value
var processed = 0;
function processArg(num) {
return (num + 3) / 5;
}
processed = processArg(7);
//1.55 Stand in Line
function nextInLine(arr, item) {
arr.push(item);
return arr.shift();
}
var testArr = [1, 2, 3, 4, 5];
console.log("Before: " + JSON.stringify(testArr));
console.log(nextInLine(testArr, 6));
console.log("After: " + JSON.stringify(testArr));
//1.56 Understanding Boolean Values
function welcomeToBooleans() {
return true;
}
//1.57 Use Conditional Logic with If Statements
function trueOrFalse(wasThatTrue) {
if (wasThatTrue) {
return "Yes, that was true"
}
return "No, that was false"
}
//1.58 Comparison with the Equality Operator
function testEqual(val) {
if (val == 12) { // Change this line
return "Equal";
}
return "Not Equal";
}
testEqual(10);
//1.59 Comparison with the Strict Equality Operator
function testStrict(val) {
if (val === 7) {
return "Equal";
}
return "Not Equal";
}
testStrict(10);
//1.60 Practice comparing different values
function compareEquality(a, b) {
if (a === b) {
return "Equal";
}
return "Not Equal";
}
compareEquality(10, "10");
//1.61 Comparison with the Inequality Operator
function testNotEqual(val) {
if (val != 99) {
return "Not Equal";
}
return "Equal";
}
testNotEqual(10);
//1.62 Comparison with the Strict Inequality Operator
function testStrictNotEqual(val) {
if (val !== 17) {
return "Not Equal";
}
return "Equal";
}
testStrictNotEqual(10);
//1.63 Comparison with the Greater Than Operator
function testGreaterThan(val) {
if (val > 100) {
return "Over 100";
}
if (val > 10) {
return "Over 10";
}
return "10 or Under";
}
testGreaterThan(10);
//1.64 Comparison with the Greater Than Or Equal To Operator
function testGreaterOrEqual(val) {
if (val >= 20) {
return "20 or Over";
}
if (val >= 10) {
return "10 or Over";
}
return "Less than 10";
}
testGreaterOrEqual(10);
//1.65 Comparison with the Less Than Operator
function testLessThan(val) {
if (val < 25) {
return "Under 25";
}
if (val < 55) {
return "Under 55";
}
return "55 or Over";
}
testLessThan(10);
//1.66 Comparison with the Less Than Or Equal To Operator
function testLessOrEqual(val) {
if (val <= 12) {
return "Smaller Than or Equal to 12";
}
if (val <= 24) {
return "Smaller Than or Equal to 24";
}
return "More Than 24";
}
testLessOrEqual(10);
//1.67 Comparisons with the Logical And Operator
function testLogicalAnd(val) {
if (val <= 50 && val >= 25) {
return "Yes";
}
return "No";
}
testLogicalAnd(10);
//1.68 Comparisons with the Logical Or Operator
function testLogicalOr(val) {
if (val < 10 || val > 20) {
return "Outside";
}
return "Inside";
}
testLogicalOr(15);
//1.69 Introducing Else Statements
function testElse(val) {
var result = "";
if (val > 5) {
result = "Bigger than 5";
} else {
result = "5 or Smaller";
}
return result;
}
testElse(4);
//1.70 Introducing Else If Statements
function testElseIf(val) {
if (val > 10) {
return "Greater than 10";
} else if (val < 5) {
return "Smaller than 5";
} else {
return "Between 5 and 10";
}
}
testElseIf(7);
//1.71 Logical Order in If Else Statements
function orderMyLogic(val) {
if (val < 5) {
return "Less than 5";
} else if (val < 10) {
return "Less than 10";
} else {
return "Greater than or equal to 10";
}
}
orderMyLogic(7);
//1.72 Chaining If Else Statements
function testSize(num) {
if (num < 5) {
return 'Tiny'; 1
} else if (num < 10) {
return 'Small';
} else if (num < 15) {
return 'Medium';
} else if (num < 20) {
return 'Large';
} else {
return 'Huge';
}
}
testSize(7);
//1.73 Golf Code
var names = ["Hole-in-one!", "Eagle", "Birdie", "Par", "Bogey", "Double Bogey", "Go Home!"];
function golfScore(par, strokes) {
switch (true) {
case (strokes === 1):
return names[0];
break;
case (strokes <= (par - 2)):
return names[1];
break;
case (strokes === (par - 1)):
return names[2];
break;
case (strokes === par):
return names[3];
break;
case (strokes === par + 1):
return names[4];
break;
case (strokes === par + 2):
return names[5];
break;
default:
return names[6];
break;
}
}
golfScore(5, 4);
//1.74 Selecting from Many Options with Switch Statements
function caseInSwitch(val) {
var answer = "";
switch (val) {
case 1:
answer = "alpha";
break;
case 2:
answer = "beta";
break;
case 3:
answer = "gamma";
break;
case 4:
answer = "delta";
break;
}
return answer;
}
caseInSwitch(1);
//1.75 Adding a Default Option in Switch Statements
function switchOfStuff(val) {
var answer = "";
switch (val) {
case "a":
answer = "apple";
break;
case "b":
answer = "bird";
break;
case "c":
answer = "cat";
break;
default:
answer = "stuff";
break;
}
return answer;
}
switchOfStuff(1);
//1.76 Multiple Identical Options in Switch Statements
function sequentialSizes(val) {
var answer = "";
switch (val) {
case 1:
case 2:
case 3:
answer = "Low";
break;
case 4:
case 5:
case 6:
answer = "Mid";
break;
case 7:
case 8:
case 9:
answer = "High";
break;
}
return answer;
}
sequentialSizes(1);
//1.77 Replacing If Else Chains with Switch
function chainToSwitch(val) {
var answer = "";
switch (val) {
case "bob":
answer = "Marley";
break;
case 42:
answer = "The Answer";
break;
case 1:
answer = "There is no #1";
break;
case 99:
answer = "Missed me by this much!";
break;
case 7:
answer = "Ate Nine";
break;
}
return answer;
}
chainToSwitch(7);
//1.78 Returning Boolean Values from Functions
function isLess(a, b) {
return a <= b;
}
isLess(10, 15);
//1.79 Return Early Pattern for Functions
function abTest(a, b) {
if (a < 0 || b < 0) {
return undefined;
}
return Math.round(Math.pow(Math.sqrt(a) + Math.sqrt(b), 2));
}
abTest(2, 2);
//1.80 Counting Cards
var count = 0;
function cc(card) {
switch (card) {
case 2:
case 3:
case 4:
case 5:
case 6:
count++;
break;
case 7:
case 8:
case 9:
break;
case 10:
case 'J':
case 'Q':
case 'K':
case 'A':
count--;
break;
}
if (count > 0) {
return count + " Bet";
} else {
return count + " Hold";
}
}
cc(2); cc(3); cc(7); cc('K'); cc('A');
//1.81 Build JavaScript Objects
var myDog = {
"name": "Ashie",
"legs": 4,
"tails": 1,
"friends": ["Tiny", "Bear"]
};
//1.82 Accessing Object Properties with Dot Notation
var testObj = {
"hat": "ballcap",
"shirt": "jersey",
"shoes": "cleats"
};
var hatValue = testObj.hat;
var shirtValue = testObj.shirt;
//1.83 Accessing Object Properties with Bracket Notation
var testObj = {
"an entree": "hamburger",
"my side": "veggies",
"the drink": "water"
};
var entreeValue = testObj["an entree"];
var drinkValue = testObj["the drink"];
//1.84 Accessing Object Properties with Variables
var testObj = {
12: "Namath",
16: "Montana",
19: "Unitas"
};
var playerNumber = 16; // Change this line
var player = testObj[playerNumber]; // Change this line
//1.85 Updating Object Properties
var myDog = {
"name": "Coder",
"legs": 4,
"tails": 1,
"friends": ["freeCodeCamp Campers"]
};
myDog.name = "Happy Coder";
//1.86 Add New Properties to a JavaScript Object
var myDog = {
"name": "Happy Coder",
"legs": 4,
"tails": 1,
"friends": ["freeCodeCamp Campers"]
};
myDog.bark = "woof";
//1.87 Delete Properties from a JavaScript Object
var myDog = {
"name": "Happy Coder",
"legs": 4,
"tails": 1,
"friends": ["freeCodeCamp Campers"],
"bark": "woof"
};
delete myDog.tails;
//1.88 Using Objects for Lookups
function phoneticLookup(val) {
var result = "";
var lookup = {
"alpha": "Adams",
"bravo": "Boston",
"charlie": "Chicago",
"delta": "Denver",
"echo": "Easy",
"foxtrot": "Frank",
" ": "undefined"
}
result = lookup[val];
// Only change code above this line
return result;
}
phoneticLookup("charlie");
//1.89 Testing Objects for Properties
function checkObj(obj, checkProp) {
if (obj.hasOwnProperty(checkProp)) {
return obj[checkProp];
} else {
return "Not Found";
}
}
//1.90 Manipulating Complex Objects
var myMusic = [
{
"artist": "Billy Joel",
"title": "Piano Man",
"release_year": 1973,
"formats": [
"CD",
"8T",
"LP"
],
"gold": true
},
// Add a data here
{
"artist": "Daft Punk",
"title": "Homework",
"release_year": 1997,
"formats": [
"CD",
"Cassette",
"LP"
],
"gold": true
}
];
//1.91 Accessing Nested Objects
var myStorage = {
"car": {
"inside": {
"glove box": "maps",
"passenger seat": "crumbs"
},
"outside": {
"trunk": "jack"
}
}
};
var gloveBoxContents = myStorage.car.inside['glove box'];
//1.92 Accessing Nested Arrays
var myPlants = [
{
type: "flowers",
list: [
"rose",
"tulip",
"dandelion"
]
},
{
type: "trees",
list: [
"fir",
"pine",
"birch"
]
}
];
var secondTree = myPlants[1].list[1];
//1.93 Record Collection
var collection = {
2548: {
albumTitle: 'Slippery When Wet',
artist: 'Bon Jovi',
tracks: ['Let It Rock', 'You Give Love a Bad Name']
},
2468: {
albumTitle: '1999',
artist: 'Prince',
tracks: ['1999', 'Little Red Corvette']
},
1245: {
artist: 'Robert Palmer',
tracks: []
},
5439: {
albumTitle: 'ABBA Gold'
}
};
function updateRecords(records, id, prop, value) {
if (prop !== 'tracks' && value !== "") {
records[id][prop] = value;
} else if (prop === "tracks" && !records[id].hasOwnProperty("tracks")) {
records[id][prop] = [value];
} else if (prop === "tracks" && value !== "") {
records[id][prop].push(value);
} else if (value === "") {
delete records[id][prop];
}
return records;
}
updateRecords(collection, 5439, 'artist', 'ABBA');
//1.94 Iterate with JavaScript While Loops
var myArray = [];
var i = 5;
while (i > -1) {
myArray.push(i);
i--;
}
//1.95 Iterate with JavaScript For Loops
var myArray = [];
for (var i = 1; i < 6; i++) {
myArray.push(i);
}
//1.96 Iterate Odd Numbers With a For Loop
var myArray = [];
for (var i = 1; i < 10; i += 2) {
myArray.push(i);
}
//1.97 Count Backwards With a For Loop
var myArray = [];
for (var i = 9; i > 0; i -= 2) {
myArray.push(i);
}
//1.98 Iterate Through an Array with a For Loop
var myArr = [2, 3, 4, 5, 6];
var total = 0;
for (var i = 0; i < myArr.length; i++) {
total = total + myArr[i];
}
//1.99 Nesting For Loops
function multiplyAll(arr) {
var product = 1;
for (var i = 0; i < arr.length; i++) {
for (var j = 0; j < arr[i].length; j++) {
product = product * arr[i][j];
}
}
return product;
}
multiplyAll([[1, 2], [3, 4], [5, 6, 7]]);
//1.100 Iterate with JavaScript Do...While Loops
var myArray = [];
var i = 10;
do {
myArray.push(i);
i++;
} while (i < 11);
//1.101 Replace Loops using Recursion
function sum(arr, n) {
// Only change code below this line
if (n <= 0) {
return 0;
} else {
return sum(arr, n - 1) + arr[n - 1];
}
}
//1.102 Profile Lookup
var contacts = [
{
"firstName": "Akira",
"lastName": "Laine",
"number": "0543236543",
"likes": ["Pizza", "Coding", "Brownie Points"]
},
{
"firstName": "Harry",
"lastName": "Potter",
"number": "0994372684",
"likes": ["Hogwarts", "Magic", "Hagrid"]
},
{
"firstName": "Sherlock",
"lastName": "Holmes",
"number": "0487345643",
"likes": ["Intriguing Cases", "Violin"]
},
{
"firstName": "Kristian",
"lastName": "Vos",
"number": "unknown",
"likes": ["JavaScript", "Gaming", "Foxes"]
}
];
function lookUpProfile(name, prop) {
for (var x = 0; x < contacts.length; x++) {
if (contacts[x].firstName === name) {
if (contacts[x].hasOwnProperty(prop)) {
return contacts[x][prop];
} else {
return "No such property";
}
}
}
return "No such contact";
}
lookUpProfile("Akira", "likes");