codeup-web-exercises/javascript-intro-notes.html at master · crystalthibodeau/codeup-web-exercises · GitHub

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<!doctype html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport"
          content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
</head>
<body>
<script>
//     var a = 1;
//     // 3
//     var b = a++;
//     // 1
//     var c = ++a;
//     // 3
//     // what is the value of a, b, and c?
//
//     var d = "hello";
//     var e = false;
//
//     d++;
//     // NaN
//     e++;
//     // 1
//
//     var perplexed; // perplexed is undefined (no value is assigned)
//     // undefined
//     perplexed + 2;
//     // NaN
//
//     var price = 2.7;
    // price.toFixed(2);
// // "2.70"
//
//     var price = "2.7";
//     price.toFixed(2);
//     // is not a function
//
//
//     isNaN(0)
//     // false
//
//     isNaN(1)
//     // false
//
//     isNaN("")
//     // false
//technically 0

//     isNaN("string")
//     // true
//
//     isNaN("0")
// // false
//
//     isNaN("1")
//     // false
//
//     isNaN("3.145")
//     // false
//
//     isNaN(Number.MAX_VALUE)
//     // false
//
//     isNaN(Infinity)
//     // false
//
//     isNaN("true")
//     // true
//
//     isNaN(true)
    // false

//     isNaN("false")
//     // true
//
//     isNaN(false)
//     // false
//
//     // to illustrate why the isNaN() function is needed:
//     NaN == NaN
// // false
//
//     !true
//     // false
//
//     !false
// true
//     !!true
// // true
//     !!false
// // false
//     !!0
// // false
//     !!-0
// // false
//     !!1
// // true
//     !!-1
//     // true
//     !!0.1
//     // true
//     !!"hello"
// // true
//     !!""
// // false
//     !!''
//     // false
//
//     !!"false"
//     // true
//
//     !!"0"
    // true


    // var sample = "Hello Codeup";
    //     Use .length to find the number of characters in the string.
        // sample.length; 12
        // Try to make the sample string all upper or all lower case.
    // sample.toLowerCase();
    //     sample.toUpperCase();

        // Update the variable sample via concatenation so that it contains "Hello Codeup Students".
        // sample += " Students";
        // Replace "Students" with "Class".
        // sample.replace("Students", "Class");
        //sample = sample.replace("Students", "Class");

        // Find the index of "c" using .indexOf(). What do you observe?
        // -1 (does not exist)

        // Find the index of "C" using .indexOf().
        // 6, start is 0

        // Retrieve a substring that contains only the word "Codeup" by using indexOf() and substring().
        // sample.substring(6, 12);
        // sample.substring(sample.indexOf("C"), sample.indexOf("p") + 1);

    //     Write some JavaScript code, that is, variables and operators, to describe the following scenarios. Do not worry about the real operations to get the values, the goal of these exercises is to understand how real world conditions can be represented with code.

    //     You have rented some movies for your kids: The little mermaid (for 3 days),
    //     Brother Bear (for 5 days, they love it),
    //     and Hercules (1 day, you don't know yet if they're going to like it).
    //     If price for a movie per day is $3, how much will you have to pay?
    // var littleMermaid = 3;
    // var brotherBear = 5;
    // var hercules = 1;
    // (littleMermaid + brotherBear + hercules) *3;

    var littleMermaid = 3 * 3;
    var brotherBear = 5 * 3;
    var hercules = 1 * 3;


    function priceForMovies(x, y, z){
        return littleMermaid + brotherBear + hercules;
    }

    console.log(priceForMovies(littleMermaid, brotherBear, hercules));


    // var days = ["littleMermaid" + "brotherBear" + "hercules"];


    //     Suppose you're working as a contractor for 3 companies: Google, Amazon and Facebook,
    //     they pay you a different rate per hour.
    //     Google pays $400,
    //     Amazon $380,
    //     and Facebook $350.
    //     How much will you receive in payment for this week?
    var googleRate = 400;
    var amazonRate = 380;
    var facebookRate = 350;

    googleMoney = 400 * 6;
    amazonMoney = 380 * 4;
    facebookMoney = 350 * 10;

   var paycheck = googleMoney + amazonMoney + facebookMoney;
   console.log(paycheck);

    var amazon = 380 * 4;
    var google = 400 * 6;
    var facebook = 350 * 10;

    function myPayCheck(x, y, z){
        return (amazon) + (google) + (facebook);
    }
console.log(myPayCheck(amazon, google, facebook));
    //     You worked 10 hours for Facebook, 6 hours for Google and 4 hours for Amazon.

    // A student can be enrolled in a class only if the class is not full and the class
    // schedule does not conflict with her current schedule.
   //  var clasNotFull = true;
   // var classConflict = true;
   // var enrolled = classNotFull && classConflict;

// var classAt8am = false;
// var classSize = 125;
// var currentClassSize = 108;
// var canRegister = (currentClassSize < classSize) && !classAt8am;


    //     A product offer can be applied only if a person buys more than 2 items,
    //     and the offer has not expired. Premium members do not need to buy a specific
    //     amount of products.

// var hasPremium = true;
// var cartSize = 6;
// var offerValid = true;
//
// var canHaveDiscount = offerValid && (cartSize > 2 || hasPremium);


    // premiumMember = true;
    // offerValid = true;
    // moreThanTwo => 2 && offerValid == true;


    //     Use the following code to follow the instructions below:


    //     var username = 'codeup';
    // var password = 'notastrongpassword';

    // Create a variable that holds a boolean value for each of the following conditions:

    //     the password must be at least 5 characters
// var atLeastFivePassword = password.length >= 5;
// var password.length >= 5;

    // the password must not include the username
// var usernameNotInPassword = password.indexOf(username) === -1;

// var usernameNotInPassword = ! password.includes(username;
    // the username must be no more than 20 characters
// var userNameNotaParagraph = username.length <= 20;

// var username.length <= 20;
    // neither the username or password can start or end with whitespace
// var whitespace = username.trim() && password.trim();

// var noWhitespace = username.trim() === username && password.trim() === password;

    // username.trim();
    // password.trim();

    // console.log(password);
    // console.log(username);
    // console.log(password.length);


</script>
</body>
</html>