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se:labs:02 [2018/10/25 21:25] emilian.radoi [Feedback] |
se:labs:02 [2023/10/10 01:13] (current) emilian.radoi [Feedback] |
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| {{https://media.makeameme.org/created/javascript-javascript-everywhere.jpg| JS}} | {{https://media.makeameme.org/created/javascript-javascript-everywhere.jpg| JS}} | ||
| + | |||
| + | **[[https://drive.google.com/file/d/125SZ_EqMi5FIPCbiNWinSkYq7xrHzhh1/view?usp=sharing | Introduction video]]** | ||
| JavaScript is the programming language of not only the browser, but also the server, native applications and even [[https://www.youtube.com/watch?v=6CmIidOxc2g|Arduino boards!]] | JavaScript is the programming language of not only the browser, but also the server, native applications and even [[https://www.youtube.com/watch?v=6CmIidOxc2g|Arduino boards!]] | ||
| Line 55: | Line 57: | ||
| <code javascript> | <code javascript> | ||
| var x = 5 | var x = 5 | ||
| - | var x | + | var x = undefined |
| console.log(x) // Prints 'undefined' | console.log(x) // Prints 'undefined' | ||
| </code> | </code> | ||
| Line 67: | Line 69: | ||
| * ''%%undefined%%'' - this means that the variable has been declared but not initialized (''%%let x%%'') | * ''%%undefined%%'' - this means that the variable has been declared but not initialized (''%%let x%%'') | ||
| + | |||
| + | <code javascript> | ||
| + | var x | ||
| + | console.log(x) // undefined | ||
| + | </code> | ||
| + | |||
| * ''%%NaN%%'' - stands for //not a number//. This is set when doing invalid conversion operations: | * ''%%NaN%%'' - stands for //not a number//. This is set when doing invalid conversion operations: | ||
| <code javascript> | <code javascript> | ||
| - | let x = 'hello' | + | let x = 'hello' * 3 |
| - | x.toString() | + | console.log(x) // NaN |
| - | console.log(x) //NaN | + | |
| </code> | </code> | ||
| + | |||
| * ''%%null%%'' - returned from some functions when no response can be given. | * ''%%null%%'' - returned from some functions when no response can be given. | ||
| + | |||
| + | <code javascript> | ||
| + | let x = 'hello'.match('bye') | ||
| + | console.log(x) // null | ||
| + | </code> | ||
| ====== Functions ====== | ====== Functions ====== | ||
| Line 136: | Line 149: | ||
| </code> | </code> | ||
| - | Try running the code above in your browser's developer console and see what happens 😊 | + | Try running the code above in your browser's developer console and see what happens. |
| ====== Network requests using fetch ====== | ====== Network requests using fetch ====== | ||
| Line 196: | Line 209: | ||
| For today, you'll going to have to do the following: | For today, you'll going to have to do the following: | ||
| - | * Download the {{:se:labs:task2.zip|zip file}} containing the tasks. | + | - Download the {{:se:labs:task2b.zip|zip file}} containing the tasks. |
| - | + | - Go to the //tasks/// folder, and complete all the functions marked with //TODO:// in the //index.js// file | |
| - | * Go to the //tasks/// folder, and complete all the functions marked with //TODO:// in the //index.js// file | + | - In the //api/// folder, you have the necessary functions of a command line API client for the typicode API. Fill in the functions and make it work by calling the addPost, getPosts and deletePost functions from the browser's command line |
| - | + | - In the apiInterface/ folder, you will have to reuse the api/ files in order to make a Postman-like interface for the API. Add event listeners to the buttons and output the result from the API in the div in the HTML. | |
| - | * In the //api/// folder, you have the necessary functions of a command line API client for the typicode API. Fill in the functions and make it work by calling the addPost, getPosts and deletePost functions from the browser's command line | + | - In the imageGif/ folder, you have an array of image locations and an img object. Can you make a GIF out of them? |
| - | + | - Optional: In the notifyMe/ folder, you already have a setup for a notification request. Trigger a notification when pressing the button. | |
| - | * In the apiInterface/ folder, you will have to reuse the api/ files in order to make a Postman-like interface for the API. Add event listeners to the buttons and output the result from the API in the div in the HTML. | + | |
| - | + | ||
| - | * In the notifyMe/ folder, you already have a setup for a notification request. Trigger a notification when pressing the button. | + | |
| - | + | ||
| - | * In the imageGif/ folder, you have an array of image locations and an img object. Can you make a GIF out of them? | + | |
| <solution -hidden> | <solution -hidden> | ||
| Line 218: | Line 226: | ||
| }, 100); | }, 100); | ||
| </code> | </code> | ||
| + | |||
| + | Task 2 solution: | ||
| + | {{:se:labs:se_lab2_task2.zip|task2}} | ||
| + | |||
| </solution> | </solution> | ||
| ====== Feedback ====== | ====== Feedback ====== | ||
| - | Please take a minute to fill in the **[[https://goo.gl/forms/VjJMUjtbmDbICFea2 | feedback form]]** for this lab. | + | Please take a minute to fill in the **[[https://forms.gle/PNZYNNZFrVChLjag8 | feedback form]]** for this lab. |
| + | /* **[[https://meet.google.com/sgd-hbwv-hhy | Google Meet]]** */ | ||
