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‎javascript-conditional-examples.js

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// Logical operators can be used in conjunction with boolean values (true and false) to create complex logical expressions.
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// By combining two boolean values together with a logical operator,
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// you create a logical expression that returns another boolean value.
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// Here’s a description of the different logical operators:
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// && Logical AND value1 && value2 Returns true if both value1 and value2 evaluate to true.
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// || Logical OR value1 || value2 Returns true if either value1 or value2 (or even both!) evaluates to true.
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// ! Logical NOT !value1 Returns the opposite of value1. If value1 is true, then !value1 is false.
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!(4 === 4) && "STRing" === "STRing"
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// Returns: false
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//Example of an if statement using a logical operator
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var colt = "not busy";
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var weather = "nice";
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if (colt === "not busy" && weather === "nice") {
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console.log("go to the park");
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}
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//Example of an else if statement using a logical operator
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var dayOfTheWeeek = "Monday";
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var weather = "cloudy";
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if (weather === "cloudy" || dayOfTheWeeek === "Tuesday") {
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console.log("Fey don't have to go to work");
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} else if (weather === "cloudy") {
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console.log("No Work");
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} else if (dayOfTheWeeek === "Monday") {
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console.log("Work");
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} else {
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console.log("Work, Work, Work");
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}
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// change the values of `balance`, `checkBalance`, and `isActive` to test your code
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var balance = 0;
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var checkBalance = true;
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var isActive = true;
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// your code goes here
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//currently not finished yet!
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if (checkBalance === false) {
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console.log("Thank you. Have a nice day!");
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} else if (checkBalance === true || isActive === false ) {
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console.log("Your acconut is no longer active");
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//} else if (checkBalance === true && balance > 0 ) {
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// console.log("Your balance is $" + balance + ".");
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} else if (checkBalance === true && isActive === true && balance === 0 ) {
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console.log("Your acconut is empty.");
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} else if (checkBalance === true && isActive === true && balance < 0 ) {
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console.log("Your balance is negative. please contact bank.");
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} else {
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console.log("Your balance is $" + balance + ".");
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}
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// or
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if (checkBalance === false) {
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console.log("Thank you. Have a nice day!");
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} else if (checkBalance === true || isActive === true && balance === 0 ) {
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console.log("Your acconut is empty.");
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} else if (checkBalance === true || isActive === false ) {
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console.log("Your acconut is no longer active");
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//} else if (checkBalance === true && balance > 0 ) {
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// console.log("Your balance is $" + balance + ".");
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} else if (checkBalance === true || isActive === true && balance < 0 ) {
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console.log("Your balance is negative. please contact bank.");
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} else {
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console.log("Your balance is $" + balance + ".");
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}
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// change the values of `flavor`, `vessel`, and `toppings` to test your code
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var flavor = "vanilla";
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var vessel = "cone";
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var toppings = "cookies";
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// Add your code here
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if (flavor === ("vanilla" || "chocolate") || vessel === ("cone" || "bowl") || toppings === ("sprinkles" || "peanuts") ) {
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console.log("I'd like two scoops of " + flavor + " ice cream in a " + vessel + " with " + toppings + ".");
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} else {
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console.log("No Ice cream");
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}
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// change the values of `shirtWidth`, `shirtLength`, and `shirtSleeve` to test your code
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//currently not finished yet!
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var shirtWidth = 19;
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var shirtLength = 28;
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var shirtSleeve = 8.39;
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// your code goes here
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if ((shirtWidth >= 18 || shirtWidth < 20) && shirtLength === 28 && shirtSleeve <= 8.38 ) {
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console.log("small (S)");
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} else if (shirtWidth < 20 && shirtLength === 29 && shirtSleeve < 8.38 ) {
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console.log("medium (M)");
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} else if (shirtWidth < 22 && shirtLength === 30 && shirtSleeve < 8.63 ) {
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console.log("large (L)");
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} else if (shirtWidth < 24 && shirtLength === 31 && shirtSleeve < 8.88 ) {
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console.log("extra large (XL)");
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} else if (shirtWidth < 26 && shirtLength === 33 && shirtSleeve < 9.63 ) {
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console.log("extra extra large (2XL)");
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} else if (shirtWidth < 28 && shirtLength === 34 && shirtSleeve < 10.13 ) {
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console.log("extra extra extra large (3XL)");
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} else {
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console.log("N/A");
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}
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// or
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var shirtWidth = 19;
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var shirtLength = 28;
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var shirtSleeve = 8.39;
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// your code goes here
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if ((shirtWidth >= 18 || shirtWidth < 20) && shirtLength === 28 && shirtSleeve <= 8.38 ) {
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console.log("small (S)");
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} else if ((shirtWidth >= 20 || shirtWidth < 22) && shirtLength === 29 && shirtSleeve < 8.63 ) {
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console.log("medium (M)");
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} else if ((shirtWidth >= 22 || shirtWidth < 24) && shirtLength === 30 && shirtSleeve < 8.88 ) {
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console.log("large (L)");
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} else if ((shirtWidth >= 24 || shirtWidth < 26) && shirtLength === 31 && shirtSleeve < 9.63 ) {
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console.log("extra large (XL)");
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} else if ((shirtWidth >= 26 || shirtWidth < 28) && shirtLength === 33 && shirtSleeve < 10.13 ) {
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console.log("extra extra large (2XL)");
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} else if ((shirtWidth >= 28 || shirtWidth < 30) && shirtLength === 34 && shirtSleeve === 10.13 ) {
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console.log("extra extra extra large (3XL)");
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} else {
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console.log("N/A");
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}
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//A value is falsy if it converts to false when evaluated in a boolean context.
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//For example, an empty String "" is falsy because, "" evaluates to false
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if ("") {
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console.log("the value is truthy");
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} else {
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console.log("the value is falsy");
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}
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Returns: "the value is falsy"
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var isGoing = true;
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var color;
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if (isGoing) {
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color = "green";
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} else {
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color = "red";
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}
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console.log(color);
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//Prints: "green
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//TIP: Using if(isGoing) is the same as using if(isGoing === true).
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//Alternatively, using if(!isGoing) is the same as using if(isGoing === false).
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//The ternary operator provides you with a shortcut alternative for writing lengthy if...else statements.
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conditional ? (if condition is true) : (if condition is false)
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var isGoing = true;
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var color = isGoing ? "green" : "red";
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console.log(color);
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//Prints: "green"
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var adult = true;
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var preorder = true;
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console.log("It costs $" + (adult ? "40.00" : "20.00") + " to attend the concert. Pick up your tickets at the " + (preorder ? "will call" : "the gate") + ".");
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// prints: It costs $40.00 to attend the concert. Pick up your tickets at the will call.
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/*
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* Programming Quiz - Navigating the Food Chain (3-8)
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*
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* Use a series of ternary operator to set the category to one of the following:
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* - "herbivore" if an animal eats plants
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* - "carnivore" if an animal eats animals
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* - "omnivore" if an animal eats plants and animals
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* - undefined if an animal doesn't eat plants or animals
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*
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* Notes
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* - use the variables `eatsPlants` and `eatsAnimals` in your ternary expressions
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* - `if` statements aren't allowed ;-)
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*/
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// change the values of `eatsPlants` and `eatsAnimals` to test your code
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//currently not finished yet!
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var eatsPlants = false;
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var eatsAnimals = false;
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var category = (eatsPlants? "herbivore" : "carnivore") && (eatsAnimals? "canivore": "herbivore") && (eatsAnimals && eatsPlants? "omnivore":"undefined"); /* your code goes here */
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console.log(category);
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/*A switch statement is an another way to chain multiple else if statements,
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that are based on the same value without using conditional statements.
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Instead, you just switch which piece of code is executed based on a value.*/
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//example 1 as an else if
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var option = 3;
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if (option === 1) {
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console.log("You selected option 1.");
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} else if (option === 2) {
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console.log("You selected option 2.");
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} else if (option === 3) {
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console.log("You selected option 3.");
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} else if (option === 4) {
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console.log("You selected option 4.");
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} else if (option === 5) {
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console.log("You selected option 5.");
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} else if (option === 6) {
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console.log("You selected option 6.");
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}
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//example 1 as a switch statement
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var option = 3;
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switch (option) {
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case 1:
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console.log("You selected option 1.");
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case 2:
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console.log("You selected option 2.");
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case 3:
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console.log("You selected option 3.");
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case 4:
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console.log("You selected option 4.");
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case 5:
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console.log("You selected option 5.");
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case 6:
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console.log("You selected option 6.");
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}
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/*Prints:
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You selected option 3.
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You selected option 4.
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You selected option 5.
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You selected option 6.*/
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//example 1 as a break statement
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var option = 3;
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switch (option) {
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case 1:
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console.log("You selected option 1.");
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break;
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case 2:
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console.log("You selected option 2.");
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break;
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case 3:
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console.log("You selected option 3.");
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break;
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case 4:
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console.log("You selected option 4.");
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break;
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case 5:
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console.log("You selected option 5.");
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break;
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case 6:
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console.log("You selected option 6.");
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break; // technically, not needed
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}
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//Prints: You selected option 3.
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//Falling-through
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var tier = "nsfw deck";
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var output = "You’ll receive "
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switch (tier) {
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case "deck of legends":
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output += "a custom card, ";
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case "collector's deck":
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output += "a signed version of the Exploding Kittens deck, ";
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case "nsfw deck":
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output += "one copy of the NSFW (Not Safe for Work) Exploding Kittens card game and ";
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default:
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output += "one copy of the Exploding Kittens card game.";
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}
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console.log(output);
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//Prints: You’ll receive one copy of the NSFW (Not Safe for Work) Exploding Kittens card game and
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//one copy of the Exploding Kittens card game.
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/*
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* Programming Quiz: Back to School (3-9)
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*/
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// change the value of `education` to test your code
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var education = "no high school diploma";
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// set the value of this based on a person's education
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var salary;
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// your code goes here
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switch (education) {
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case "no high school diploma":
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salary = ("earned an average of $25,636/year");
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break;
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case "a high school diploma":
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salary = ("earned an average of $35,256/year");
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break;
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case "an Associate's degree":
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salary = ("earned an average of $41,496/year");
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break;
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case "a Bachelor's degree":
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salary = ("earned an average of $59,124/year");
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break;
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case "a Master's degree":
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salary = ("earned an average of $69,732/year");
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break;
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case "a Professional degree":
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salary = ("earned an average of $89,960/year");
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break;
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case "a Doctoral degree":
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salary = ("earned an average of $84,396/year");
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break; // technically, not needed
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}
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console.log("In 2015, a person with " + education + " earned an average of " + salary + ".");
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//Example of an else if statement
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// change the value of `weather` to test your conditional statements
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var weather = "snow";
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if (weather === "snow") {
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console.log("Bring a coat.");
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} else if (weather === "rain") {
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console.log("Bring a rain jacket.");
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} else {
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console.log("Wear what you have on.");
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}
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//Example of an if else statement
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var a = 1;
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var b = 2;
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if (a > b) {
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console.log("a is greater than b");
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} else {
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console.log("a is less than or equal to b");
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}
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//Example of an else if statement
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// change the value of `musicians` to test your conditional statements
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var musicians = 1;
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if (musicians <= 0) {
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console.log("not a group");
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} else if (musicians == -1) {
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console.log("not a group");
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} else if (musicians == 1) {
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console.log("solo");
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} else if (musicians == 2) {
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console.log("duet");
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} else if (musicians == 3) {
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console.log("trio");
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} else if (musicians == 4) {
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console.log("quartet");
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} else {
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console.log("this is a large group");
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}
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//Javascipt for making the topbanner of your page the same height of the device
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//just change the '.topbanner' to the name of the class for your top banner or jumbotron.
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<script>
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$(window).resize(function() {
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$('.topbanner').height($(window).height());
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});
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$(window).trigger('resize');
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</script>

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