From aafceeea7ea6713215b5ab20c40e9b81aadfb924 Mon Sep 17 00:00:00 2001 From: Amin Hasan Date: Fri, 20 Dec 2019 08:15:16 +0000 Subject: [PATCH 1/8] Objects complete --- challenges/objects-arrays.js | 34 ++++++++++++++++++++++++++++------ 1 file changed, 28 insertions(+), 6 deletions(-) diff --git a/challenges/objects-arrays.js b/challenges/objects-arrays.js index 659e3e149c..a5b1f9fed3 100644 --- a/challenges/objects-arrays.js +++ b/challenges/objects-arrays.js @@ -7,28 +7,50 @@ */ // tyrannosaurus, carnivorous, 7000kg, 12m, Late Cretaceous - +const tyrannosaurus = { + diet: "carnivorous", + weight: "7000kg", + length: "12m", + period: "Late Cretaceous" +}; // stegosaurus, herbivorous, 2000kg, 9m, Late Jurassic +const stegosaurus = { + diet: "herbivorous", + weight: "2000kg", + length: "9m", + period: "Late Jurassic" +}; + // velociraptor, carnivorous, 15kg, 1.8m, Late Cretaceous +const velociraptor = { + diet: "carnivorous", + weight: "15kg", + length: "1.8m", + period: "Late Cretaceous" +}; + // Using your dinosaur objects, log answers to these questions: // How much did tyrannosaurus weigh? -console.log(); +console.log(tyrannosaurus.weight); // What was the diet of a velociraptor? -console.log(); +console.log(velociraptor.diet); // How long was a stegosaurus? -console.log(); +console.log(stegosaurus.length); // What time period did tyrannosaurus live in? -console.log(); +console.log(tyrannosaurus.period)); // Create a new roar method for the tyrannosaurus. When called, return "RAWERSRARARWERSARARARRRR!" Log the result. -console.log(); +tyrannosaurus.roar = function() { + return "RAWERSRARARWERSARARARRRR"; +}; +console.log(tyrannosaurus.roar()); // ==== Arrays ==== From 85771de20b65d5cab3e78a86a004f04142e6f674 Mon Sep 17 00:00:00 2001 From: Amin Hasan Date: Fri, 20 Dec 2019 08:41:36 +0000 Subject: [PATCH 2/8] Arrays complete --- challenges/objects-arrays.js | 15 +++++++++++++-- 1 file changed, 13 insertions(+), 2 deletions(-) diff --git a/challenges/objects-arrays.js b/challenges/objects-arrays.js index a5b1f9fed3..7e0d3cd874 100644 --- a/challenges/objects-arrays.js +++ b/challenges/objects-arrays.js @@ -43,7 +43,7 @@ console.log(velociraptor.diet); console.log(stegosaurus.length); // What time period did tyrannosaurus live in? -console.log(tyrannosaurus.period)); +console.log(tyrannosaurus.period); // Create a new roar method for the tyrannosaurus. When called, return "RAWERSRARARWERSARARARRRR!" Log the result. @@ -74,7 +74,10 @@ const graduates = [ Once you have the new array created, sort the universities alphabetically and log the result. */ const universities = []; -console.log(universities); +for (let i = 0; i Date: Fri, 20 Dec 2019 08:54:52 +0000 Subject: [PATCH 3/8] Advanced Arrays + Stretch complete --- challenges/objects-arrays.js | 21 ++++++++++++++++++--- 1 file changed, 18 insertions(+), 3 deletions(-) diff --git a/challenges/objects-arrays.js b/challenges/objects-arrays.js index 7e0d3cd874..0f28e6df93 100644 --- a/challenges/objects-arrays.js +++ b/challenges/objects-arrays.js @@ -124,6 +124,9 @@ The zoos want to display both the scientific name and the animal name in front o */ const displayNames = []; +zooAnimals.forEach((index) => { + displayNames.push `Name: ${index.animal_name}, Scientific: ${index.scientific_name}`; +}); console.log(displayNames); /* Request 2: .map() @@ -132,7 +135,9 @@ The zoos need a list of all their animal's names (animal_name only) converted to */ -const lowCaseAnimalNames = []; +const lowCaseAnimalNames = zooAnimals.map((animals) => { + return animals.animal_name.toLowerCase(); +}); console.log(lowCaseAnimalNames); /* Request 3: .filter() @@ -140,7 +145,9 @@ console.log(lowCaseAnimalNames); The zoos are concerned about animals with a lower population count. Using filter, create a new array of objects called lowPopulationAnimals which contains only the animals with a population less than 5. */ -const lowPopulationAnimals = []; +const lowPopulationAnimals = zooAnimals.filter((lessThan5) => { + return (lessThan5.population < 5); +}); console.log(lowPopulationAnimals); /* Request 4: .reduce() @@ -148,7 +155,15 @@ console.log(lowPopulationAnimals); The zoos need to know their total animal population across the United States. Find the total population from all the zoos using the .reduce() method. Remember the reduce method takes two arguments: a callback (which itself takes two args), and an initial value for the count. */ -const populationTotal = 0; +const populationTotal = []; +zooAnimals.forEach((unitedStates) => { + populationTotal.push(unitedStates.population); +}); + +const totalPop = zooAnimals.reduce( + (accumulator, animal) => accumulator + animal.population, + 0 +); console.log(populationTotal); From aadb324e26238dc46ad5b87e8cf5055c530bab6a Mon Sep 17 00:00:00 2001 From: Amin Hasan Date: Fri, 20 Dec 2019 09:01:01 +0000 Subject: [PATCH 4/8] Callbacks complete --- challenges/functions.js | 20 +++++++++++++++++--- 1 file changed, 17 insertions(+), 3 deletions(-) diff --git a/challenges/functions.js b/challenges/functions.js index 6e3688bfcc..ed5aac0ff9 100644 --- a/challenges/functions.js +++ b/challenges/functions.js @@ -7,6 +7,9 @@ * The consume function should return the invocation of cb, passing a and b into cb as arguments */ +function consume(a, b, cb) { + return cb(a, b); +} /* Step 2: Create several functions to callback with consume(); * Create a function named add that returns the sum of two numbers @@ -14,11 +17,22 @@ * Create a function named greeting that accepts a first and last name and returns "Hello first-name last-name, nice to meet you!" */ +function add (a, b) { + return a + b; +} + +function multiply (a, b) { + return a * b; +} + +function greeting (firstName, lastName) { + return `Hello ${firstName} ${lastName}, nice to meet you!` +} /* Step 3: Check your work by un-commenting the following calls to consume(): */ -// console.log(consume(2, 2, add)); // 4 -// console.log(consume(10, 16, multiply)); // 160 -// console.log(consume("Mary", "Poppins", greeting)); // Hello Mary Poppins, nice to meet you! +console.log(consume(2, 2, add)); // 4 +console.log(consume(10, 16, multiply)); // 160 +console.log(consume("Mary", "Poppins", greeting)); // Hello Mary Poppins, nice to meet you! // ==== Closures ==== From 94f9e318bcf4dbd1ad2f0ca830622522b334121e Mon Sep 17 00:00:00 2001 From: Amin Hasan Date: Fri, 20 Dec 2019 09:02:40 +0000 Subject: [PATCH 5/8] Closures complete --- challenges/functions.js | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/challenges/functions.js b/challenges/functions.js index ed5aac0ff9..85cdf26cdd 100644 --- a/challenges/functions.js +++ b/challenges/functions.js @@ -39,7 +39,7 @@ console.log(consume("Mary", "Poppins", greeting)); // Hello Mary Poppins, nice t // Explain in your own words why nestedfunction can access the variable internal. -// Explanation: +// Explanation: Nested functions 'inherit' arguments and variables of its containing function. This means that variables only have to be declared once because the inner functon contains the scope of the outer function. const external = "I'm outside the function"; From 2745b7785e04197123df8c6547ec7b98cdbb355a Mon Sep 17 00:00:00 2001 From: Amin Hasan Date: Fri, 20 Dec 2019 09:07:00 +0000 Subject: [PATCH 6/8] Prototype Practice complete --- challenges/prototypes.js | 21 +++++++++++++++++++-- 1 file changed, 19 insertions(+), 2 deletions(-) diff --git a/challenges/prototypes.js b/challenges/prototypes.js index 4cafc33e95..b50e9eccb7 100644 --- a/challenges/prototypes.js +++ b/challenges/prototypes.js @@ -6,6 +6,11 @@ Create a constructor function named CuboidMaker that accepts properties for length, width, and height */ +function CuboidMaker(attributes) { + this.length = attributes.length; + this.width = attributes.width; + this.height = attributes.height; +} /* == Step 2: Volume Method == Create a method using CuboidMaker's prototype that returns the volume of a given cuboid's length, width, and height @@ -13,6 +18,9 @@ Formula for cuboid volume: length * width * height */ +CuboidMaker.prototype.volume = function () { + return (this.length * this.width * this.height); +} /* == Step 3: Surface Area Method == Create another method using CuboidMaker's prototype that returns the surface area of a given cuboid's length, width, and height. @@ -20,14 +28,23 @@ Formula for cuboid surface area of a cube: 2 * (length * width + length * height + width * height) */ +CuboidMaker.prototype.surfaceArea = function () { + return 2 * (this.length * this.width + this.length * this.height + this.width * this.height); +} /* == Step 4: Create a new object that uses CuboidMaker == Create a cuboid object that uses the new keyword to use our CuboidMaker constructor Add properties and values of length: 4, width: 5, and height: 5 to cuboid. */ +const cuboid = new CuboidMaker({ + length: 4, + width: 5, + height: 5 +}); + // Test your volume and surfaceArea methods by uncommenting the logs below: -// console.log(cuboid.volume()); // 100 -// console.log(cuboid.surfaceArea()); // 130 +console.log(cuboid.volume()); // 100 +console.log(cuboid.surfaceArea()); // 130 From 8a51db61a6e4b9c8441c86fc3d089e6b38423f1d Mon Sep 17 00:00:00 2001 From: Amin Hasan Date: Fri, 20 Dec 2019 09:29:54 +0000 Subject: [PATCH 7/8] Classes + Stretch complete --- challenges/classes.js | 33 ++++++++++++++++++++++++++++++--- 1 file changed, 30 insertions(+), 3 deletions(-) diff --git a/challenges/classes.js b/challenges/classes.js index 992e39dc0b..ffa17a2926 100644 --- a/challenges/classes.js +++ b/challenges/classes.js @@ -1,7 +1,34 @@ // 1. Copy and paste your prototype in here and refactor into class syntax. +class CuboidMakerClass { + constructor(length, width, height) { + this.length = length; + this.width = width; + this.height = height; + } + volume() { + return this.length * this.width * this.height; + } + surfaceArea() { + return 2 * (this.length * this.width + this.length * this.height + this.width * this.height); + }; +} + +const cuboidClass = new CuboidMakerClass(4, 5, 5); + // Test your volume and surfaceArea methods by uncommenting the logs below: -// console.log(cuboid.volume()); // 100 -// console.log(cuboid.surfaceArea()); // 130 +console.log(cuboid.volume()); // 100 +console.log(cuboid.surfaceArea()); // 130 + +// Stretch Task: Extend the base class CuboidMaker with a sub class called CubeMaker. Find out the formulas for volume and surface area for cubes and create those methods using the dimension properties from CuboidMaker. Test your work by logging out your volume and surface area. + +class CubeMaker extends CuboidMakerClass { + constructor(length, width, height){ + super(length, width, height) + } +} + +const cube = new CuboidMakerClass(1, 1, 1) -// Stretch Task: Extend the base class CuboidMaker with a sub class called CubeMaker. Find out the formulas for volume and surface area for cubes and create those methods using the dimension properties from CuboidMaker. Test your work by logging out your volume and surface area. \ No newline at end of file +console.log(cube.volume()); +console.log(cube.surfaceArea()); \ No newline at end of file From b95b150976c9657ee4fb3b48275105b3cc16056a Mon Sep 17 00:00:00 2001 From: Amin Hasan Date: Fri, 20 Dec 2019 09:33:35 +0000 Subject: [PATCH 8/8] Self-Study Questions complete --- README.md | 31 ++++++++++++++++++++++--------- 1 file changed, 22 insertions(+), 9 deletions(-) diff --git a/README.md b/README.md index 408612117c..6217672877 100644 --- a/README.md +++ b/README.md @@ -30,30 +30,43 @@ Edit this document to include your answers after each question. Make sure to lea 1. Describe the biggest difference between `.forEach` & `.map`. +Both `.forEach` & `.map` are array iterators. The big difference between them is that `.map` allows us to transform the array by creating a new one without harming the original array, whereas `.forEach` modifies the existing array. + 2. What is the difference between a function and a method? +Everything in Javascript is an object, so a function is an object. A method is a function that's inside another function (or object). + 3. What is closure? +A closure is a nested function which gives you access to an outer function scope. + 4. Describe the four rules of the 'this' keyword. +* 1. Window (or Global) binding - the value of this will be the window object or the global scope where all the javascript is. This can be avoided by typing in "use strict" at the top of your code. +* 2. Implicit binding - when a function is called by a preceding dot, whatever is to the left of the dot is what "this" will be referencing. +* 3. New binding - when a function is invoked using the "new" keyword. These are used with the constructor function. +* 4. Explicit binding - "call", "apply", "bind" keywords are used to override what the "this" keyword is pointing to. + 5. Why do we need super() in an extended class? +`super()` is used for a child function which calls the parent class. It is used to avoid duplciating the constructor parts that are common between a parent and child element and providing fine control over constructor syntax. + ## Project Set up Follow these steps to set up and work on your project: -- [ ] Create a forked copy of this project. -- [ ] Add TL as collaborator on Github. -- [ ] Clone your OWN version of Repo (Not Lambda's by mistake!). -- [ ] Create a new Branch on the clone: git checkout -b ``. -- [ ] Create a pull request before you start working on the project requirements. You will continuously push your updates throughout the project. -- [ ] You are now ready to build this project with your preferred IDE -- [ ] Implement the project on your Branch, committing changes regularly. -- [ ] Push commits: git push origin ``. +- [x] Create a forked copy of this project. +- [x] Add TL as collaborator on Github. +- [x] Clone your OWN version of Repo (Not Lambda's by mistake!). +- [x] Create a new Branch on the clone: git checkout -b ``. +- [x] Create a pull request before you start working on the project requirements. You will continuously push your updates throughout the project. +- [x] You are now ready to build this project with your preferred IDE +- [x] Implement the project on your Branch, committing changes regularly. +- [x] Push commits: git push origin ``. Follow these steps for completing your project: -- [ ] Submit a Pull-Request to merge Branch into master (student's Repo). +- [x] Submit a Pull-Request to merge Branch into master (student's Repo). - [ ] Add your team lead as a Reviewer on the Pull-request - [ ] TL then will count the HW as done by merging the branch back into master.