title
1.1: fetch() - Working With Data & APIs in JavaScript

description
Welcome to Working with Data and APIs in Javascript! This course is for aspiring developers who want to learn how to work with data in web applications. How do you retrieve, collect, and store data? The course will be taught through a series of creating three data projects. This is the first video of the series! 1.1 This video is client-side only and covers the web fetch() API, loading image data and focusing on handling asynchronous events with Promises (async / await), 🎥 NEXT LESSON: https://youtu.be/RfMkdvN-23o 🎥 FULL COURSE: https://www.youtube.com/playlist?list=PLRqwX-V7Uu6YxDKpFzf_2D84p0cyk4T7X 💻https://github.com/CodingTrain/Intro-to-Data-APIs-JS 🔗https://developer.mozilla.org/en-US/docs/Web/API/Fetch_API 🚂 Website: http://thecodingtrain.com/ 💖 Patreon: https://patreon.com/codingtrain 🛒 Store: https://www.designbyhumans.com/shop/codingtrain/ 📚 Books: https://www.amazon.com/shop/thecodingtrain 🎥 Coding Challenges: https://www.youtube.com/playlist?list=PLRqwX-V7Uu6ZiZxtDDRCi6uhfTH4FilpH 🎥 Intro to Programming: https://www.youtube.com/playlist?list=PLRqwX-V7Uu6Zy51Q-x9tMWIv9cueOFTFA 🔗 p5.js: https://p5js.org 🔗 Processing: https://processing.org 📄 Code of Conduct: https://github.com/CodingTrain/Code-of-Conduct

detail
{'title': '1.1: fetch() - Working With Data & APIs in JavaScript', 'heatmap': [{'end': 329.478, 'start': 307.326, 'weight': 0.927}, {'end': 395.947, 'start': 366.383, 'weight': 0.806}, {'end': 433.851, 'start': 411.76, 'weight': 0.805}, {'end': 516.688, 'start': 497.652, 'weight': 1}], 'summary': 'Learn about the web fetch api in javascript for fetching data and images, using fetch and javascript promises for image handling, and employing async and await for improved readability and error handling in promises.', 'chapters': [{'end': 236.41, 'segs': [{'end': 88.692, 'src': 'embed', 'start': 0.969, 'weight': 0, 'content': [{'end': 7.911, 'text': 'Hello, and welcome to the first tutorial video in this new series, Working with Data and APIs in JavaScript.', 'start': 0.969, 'duration': 6.942}, {'end': 12.073, 'text': 'So in this first video, I just want to look at one thing, the Web Fetch API.', 'start': 8.17, 'duration': 3.903}, {'end': 12.933, 'text': 'Fetch is a function.', 'start': 12.133, 'duration': 0.8}, {'end': 13.993, 'text': "It's a wonderful function.", 'start': 12.973, 'duration': 1.02}, {'end': 19.196, 'text': 'It allows you to fetch stuff, data, images, from all sorts of different kinds of places and do stuff with it.', 'start': 14.293, 'duration': 4.903}, {'end': 21.617, 'text': "So we're going to start with a very basic example.", 'start': 19.516, 'duration': 2.101}, {'end': 22.558, 'text': "It's right here.", 'start': 21.817, 'duration': 0.741}, {'end': 30.083, 'text': 'It fetches a rainbow image, a local file, a JPEG file, and displays it on the web page itself.', 'start': 23.118, 'duration': 6.965}, {'end': 31.884, 'text': "That's going to build.", 'start': 30.643, 'duration': 1.241}, {'end': 38.689, 'text': "That's the foundation on top of which we will build other examples that are grabbing a spreadsheet of data and graphing it,", 'start': 31.904, 'duration': 6.785}, {'end': 45.053, 'text': 'or reaching out to some weather service and getting the temperature based on the latitude and longitude all sorts of possibilities.', 'start': 38.689, 'duration': 6.364}, {'end': 56.607, 'text': 'The best place for you to learn all of the details with everything you could ever possibly want to know about the Fetch Web API is on the Mozilla Developer Network site.', 'start': 47.255, 'duration': 9.352}, {'end': 61.433, 'text': "So that's where I tend to look up documentation stuff for JavaScript stuff I want to do in the browser.", 'start': 56.827, 'duration': 4.606}, {'end': 67.298, 'text': "you a small slice of what's possible with Fetch and kind of build on that as we go video, video to video.", 'start': 61.914, 'duration': 5.384}, {'end': 75.443, 'text': "There's this idea in web programming of making a request, an HTTP request, a hypertext transfer protocol request.", 'start': 67.638, 'duration': 7.805}, {'end': 76.844, 'text': 'I could make a get request.', 'start': 75.703, 'duration': 1.141}, {'end': 81.087, 'text': 'Will you please give me, could I please, could I please get some information? I could make a post request.', 'start': 76.944, 'duration': 4.143}, {'end': 88.692, 'text': "Could I please send some information to you? And we're going to do both of those kinds of requests and Fetch can actually both retrieve and send.", 'start': 81.427, 'duration': 7.265}], 'summary': 'Intro to fetch web api for fetching and displaying data, with examples of image retrieval and potential uses for data and weather services.', 'duration': 87.723, 'max_score': 0.969, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/tc8DU14qX6I/pics/tc8DU14qX6I969.jpg'}, {'end': 162.447, 'src': 'embed', 'start': 133.935, 'weight': 2, 'content': [{'end': 139.157, 'text': 'And the fetch function is a function that happens asynchronously, meaning we call fetch,', 'start': 133.935, 'duration': 5.222}, {'end': 143.279, 'text': 'But some time passes because it takes some time to retrieve that data.', 'start': 139.497, 'duration': 3.782}, {'end': 152.182, 'text': "So how we get the response as part of a promise is a detail that I'm going to have to look at specifically when we get into the code.", 'start': 143.619, 'duration': 8.563}, {'end': 162.447, 'text': "And I will also include in this video's description some links to further details about how to work with JavaScript promises some other videos that I've made that might fill in some of the gaps here.", 'start': 152.423, 'duration': 10.024}], 'summary': 'The fetch function in javascript works asynchronously, taking time to retrieve data and returning a promise for the response.', 'duration': 28.512, 'max_score': 133.935, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/tc8DU14qX6I/pics/tc8DU14qX6I133935.jpg'}], 'start': 0.969, 'title': 'Web fetch api in javascript', 'summary': 'Introduces the versatile web fetch api in javascript for fetching data and images from various sources. it sets the foundation for complex examples involving graphing data and retrieving weather information.', 'chapters': [{'end': 45.053, 'start': 0.969, 'title': 'Web fetch api in javascript', 'summary': 'Introduces the web fetch api in javascript, highlighting its versatility in fetching data and images from various sources and using it to perform different tasks, setting the foundation for more complex examples involving graphing data and retrieving weather information.', 'duration': 44.084, 'highlights': ['The Web Fetch API is a versatile function that allows fetching data and images from various sources, serving as the foundation for building other examples involving graphing data and retrieving weather information.', 'In the tutorial, a basic example of using the Web Fetch API to fetch a rainbow image and display it on the web page is demonstrated.']}, {'end': 236.41, 'start': 47.255, 'title': 'Learning fetch web api', 'summary': 'Introduces the fetch web api, outlining its capabilities in making http requests, processing responses as streams, and handling data formats like json, with a focus on retrieving and storing data.', 'duration': 189.155, 'highlights': ['The Fetch Web API is best learned on the Mozilla Developer Network site, providing comprehensive documentation for JavaScript and browser-related tasks.', "The chapter introduces the concept of making HTTP requests, including get and post requests, and highlights Fetch's ability to both retrieve and send data.", 'Explains the steps involved in using Fetch, such as calling the fetch function with the resource path, dealing with the response using promises, and completing the data stream in formats like JSON and blobs.']}], 'duration': 235.441, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/tc8DU14qX6I/pics/tc8DU14qX6I969.jpg', 'highlights': ['The Web Fetch API is a versatile function that allows fetching data and images from various sources, serving as the foundation for building other examples involving graphing data and retrieving weather information.', "The chapter introduces the concept of making HTTP requests, including get and post requests, and highlights Fetch's ability to both retrieve and send data.", 'Explains the steps involved in using Fetch, such as calling the fetch function with the resource path, dealing with the response using promises, and completing the data stream in formats like JSON and blobs.', 'In the tutorial, a basic example of using the Web Fetch API to fetch a rainbow image and display it on the web page is demonstrated.', 'The Fetch Web API is best learned on the Mozilla Developer Network site, providing comprehensive documentation for JavaScript and browser-related tasks.']}, {'end': 523.412, 'segs': [{'end': 266.987, 'src': 'embed', 'start': 236.41, 'weight': 0, 'content': [{'end': 238.19, 'text': 'this is really the steps for using fetch.', 'start': 236.41, 'duration': 1.78}, {'end': 251.996, 'text': 'but in this particular scenario I want to make an image element, make an img HTML DOM element, make an image element with that data.', 'start': 238.19, 'duration': 13.806}, {'end': 256.539, 'text': 'So these are the steps of this example, and I think we can just go code this now.', 'start': 252.796, 'duration': 3.743}, {'end': 261.942, 'text': "So what I'm beginning with is just some boilerplate HTML, basic HTML file with nothing in it.", 'start': 256.959, 'duration': 4.983}, {'end': 263.925, 'text': "And so let's add some stuff to it.", 'start': 262.324, 'duration': 1.601}, {'end': 266.987, 'text': 'So first, let me add an image element to the body.', 'start': 263.965, 'duration': 3.022}], 'summary': 'Using fetch to create an img html dom element in a basic html file.', 'duration': 30.577, 'max_score': 236.41, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/tc8DU14qX6I/pics/tc8DU14qX6I236410.jpg'}, {'end': 351.595, 'src': 'heatmap', 'start': 307.326, 'weight': 1, 'content': [{'end': 312.128, 'text': 'about to fetch a rainbow, because why not?', 'start': 307.326, 'duration': 4.802}, {'end': 315.35, 'text': "So I'm using something called live server.", 'start': 312.328, 'duration': 3.022}, {'end': 320.672, 'text': "It's a node package to host this particular HTML page on my computer.", 'start': 315.39, 'duration': 5.282}, {'end': 325.835, 'text': 'So every time that I hit save, it updates in the browser and you can see that now I have that console log there.', 'start': 320.732, 'duration': 5.103}, {'end': 329.478, 'text': 'Now I said earlier that the fetch function returns a promise.', 'start': 326.295, 'duration': 3.183}, {'end': 332.8, 'text': 'And a promise is a way in JavaScript to handle an asynchronous event.', 'start': 329.538, 'duration': 3.262}, {'end': 337.484, 'text': 'It gets resolved when the event is over, when the data is retrieved.', 'start': 333.08, 'duration': 4.404}, {'end': 342.327, 'text': 'And I will refer you to some other videos that go on my channel that go into promises in more depth.', 'start': 337.744, 'duration': 4.583}, {'end': 347.571, 'text': 'But the quick explanation here is that you can use the method then.', 'start': 342.628, 'duration': 4.943}, {'end': 351.595, 'text': 'So the method then is a place where I can handle this response.', 'start': 347.872, 'duration': 3.723}], 'summary': 'Using live server to host html page, demonstrating usage of fetch function and handling promises in javascript.', 'duration': 44.269, 'max_score': 307.326, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/tc8DU14qX6I/pics/tc8DU14qX6I307326.jpg'}, {'end': 395.947, 'src': 'heatmap', 'start': 366.383, 'weight': 0.806, 'content': [{'end': 371.946, 'text': 'But before I do that, let me just say console.log response just so I can see it.', 'start': 366.383, 'duration': 5.563}, {'end': 373.947, 'text': 'So it helps to spell things correctly.', 'start': 372.306, 'duration': 1.641}, {'end': 377.581, 'text': "Response And we can see there's that response.", 'start': 374.487, 'duration': 3.094}, {'end': 382.643, 'text': 'And you can see all the metadata associated with the response is here in the JavaScript console.', 'start': 378.222, 'duration': 4.421}, {'end': 390.665, 'text': 'And what I actually want to do is say return response.blob, because I want to.', 'start': 382.903, 'duration': 7.762}, {'end': 392.326, 'text': 'this is what we talked about before.', 'start': 390.665, 'duration': 1.661}, {'end': 395.947, 'text': 'I want to convert the response into an image blob.', 'start': 392.326, 'duration': 3.621}], 'summary': 'Converting response to image blob using javascript.', 'duration': 29.564, 'max_score': 366.383, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/tc8DU14qX6I/pics/tc8DU14qX6I366383.jpg'}, {'end': 433.851, 'src': 'heatmap', 'start': 411.76, 'weight': 0.805, 'content': [{'end': 421.365, 'text': 'now I have the response to the next promise and we can see that is also not defined because I cannot spell to save my life.', 'start': 411.76, 'duration': 9.605}, {'end': 423.346, 'text': 'That is now the blob.', 'start': 422.025, 'duration': 1.321}, {'end': 429.849, 'text': 'So in this case, actually, maybe it makes more sense for me to name this variable something else, like let me just call it blob.', 'start': 423.546, 'duration': 6.303}, {'end': 433.851, 'text': "And now, what you'll see is there's the sequence is as follows.", 'start': 430.209, 'duration': 3.642}], 'summary': "The response to the promise is not defined, renaming the variable to 'blob'.", 'duration': 22.091, 'max_score': 411.76, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/tc8DU14qX6I/pics/tc8DU14qX6I411760.jpg'}, {'end': 503.713, 'src': 'embed', 'start': 476.307, 'weight': 3, 'content': [{'end': 483.869, 'text': "And you can see that doesn't work because the blob, the data blob, isn't in the format that the image DOM element expects.", 'start': 476.307, 'duration': 7.562}, {'end': 484.789, 'text': 'Luckily for us,', 'start': 484.249, 'duration': 0.54}, {'end': 492.831, 'text': 'there happens to be a function called create object URL that takes a blob object and turns it into the format that an image DOM element would expect.', 'start': 484.789, 'duration': 8.042}, {'end': 497.412, 'text': 'You can look up more about this function also on the MDN JavaScript docs.', 'start': 493.291, 'duration': 4.121}, {'end': 503.713, 'text': 'But all I need to do here is say URL dot create object URL, pass in the blob.', 'start': 497.652, 'duration': 6.061}], 'summary': 'The createobjecturl function converts a blob into the format expected by an image dom element.', 'duration': 27.406, 'max_score': 476.307, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/tc8DU14qX6I/pics/tc8DU14qX6I476307.jpg'}, {'end': 522.351, 'src': 'heatmap', 'start': 497.652, 'weight': 1, 'content': [{'end': 503.713, 'text': 'But all I need to do here is say URL dot create object URL, pass in the blob.', 'start': 497.652, 'duration': 6.061}, {'end': 507.384, 'text': 'And there it is, we have our rainbow.', 'start': 505.123, 'duration': 2.261}, {'end': 513.587, 'text': "It's kind of a large image, so I'm just going to add another attribute, like width equals 480.", 'start': 507.684, 'duration': 5.903}, {'end': 516.688, 'text': 'So it sort of makes the image smaller.', 'start': 513.587, 'duration': 3.101}, {'end': 517.229, 'text': 'And there we go.', 'start': 516.729, 'duration': 0.5}, {'end': 518.69, 'text': 'Oh, we have a beautiful rainbow.', 'start': 517.369, 'duration': 1.321}, {'end': 522.351, 'text': 'So this really wraps up this particular tutorial.', 'start': 519.13, 'duration': 3.221}], 'summary': 'Creating a rainbow image with url.createobjecturl(blob) and adjusting its size to 480.', 'duration': 24.699, 'max_score': 497.652, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/tc8DU14qX6I/pics/tc8DU14qX6I497652.jpg'}], 'start': 236.41, 'title': 'Using fetch and javascript promises for image handling', 'summary': "Covers using fetch to retrieve an image, involving html img element creation, javascript code addition, and fetch function utilization; also introduces javascript promises, demonstrating asynchronous event handling, including 'then' method usage, promise chaining, data conversion, and object url function use.", 'chapters': [{'end': 329.478, 'start': 236.41, 'title': 'Using fetch to retrieve an image', 'summary': 'Discusses the process of using fetch to retrieve an image, covering the steps involved in creating an html img element, adding javascript code, and utilizing the fetch function to retrieve the image, while also demonstrating the use of console.log and live server.', 'duration': 93.068, 'highlights': ['The chapter discusses the process of using fetch to retrieve an image, covering the steps involved in creating an HTML img element, adding JavaScript code, and utilizing the fetch function to retrieve the image, while also demonstrating the use of console.log and live server.', "The speaker begins with a basic HTML file and adds an image element with an ID called 'rainbow' to the body.", 'The speaker mentions the intention of adding a script tag to include JavaScript code, potentially considering a separate file or build system for the project in the future.', "The speaker uses the fetch function to retrieve 'rainbow.jpg' and adds a console.log statement for the process, demonstrating the asynchronous nature of the fetch function, and hosts the HTML page using live server to observe the changes in real-time.", 'The speaker notes that the fetch function returns a promise, indicating the asynchronous behavior of the function.']}, {'end': 523.412, 'start': 329.538, 'title': 'Javascript promises and handling asynchronous events', 'summary': "Introduces javascript promises and demonstrates handling asynchronous events using promises to fetch and display an image, with key points including the use of 'then' method to handle response, chaining promises, converting data into a blob, and using create object url function to display the image.", 'duration': 193.874, 'highlights': ['The chapter introduces JavaScript promises and demonstrates handling asynchronous events using promises to fetch and display an image.', 'The method then is used to handle the response from the asynchronous event, and chaining promises allows for sequential processing of the retrieved data.', 'The process involves converting the response data into a blob, and utilizing create object URL function to display the image in the expected format, with an additional attribute for resizing.', 'The tutorial provides practical demonstrations and explanations for working with JavaScript promises and handling asynchronous events.']}], 'duration': 287.002, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/tc8DU14qX6I/pics/tc8DU14qX6I236410.jpg', 'highlights': ['The chapter covers using fetch to retrieve an image and demonstrates the process of creating an HTML img element, adding JavaScript code, and utilizing the fetch function.', "The tutorial introduces JavaScript promises and demonstrates their usage in handling asynchronous events, including 'then' method usage and promise chaining.", 'The speaker demonstrates the asynchronous nature of the fetch function and the use of console.log and live server for real-time observation.', 'The process involves converting the response data into a blob and utilizing the create object URL function to display the image in the expected format.']}, {'end': 928.477, 'segs': [{'end': 606.794, 'src': 'embed', 'start': 543.422, 'weight': 0, 'content': [{'end': 549.665, 'text': 'So what if something goes wrong? I should handle an error, at least log the error to the console so I can see that something went wrong.', 'start': 543.422, 'duration': 6.243}, {'end': 558.01, 'text': 'Number two is I want to introduce the JavaScript keywords async and await.', 'start': 550.345, 'duration': 7.665}, {'end': 566.156, 'text': 'And these are new features of the JavaScript language that allow us to handle promises in a slightly more readable and elegant way.', 'start': 558.33, 'duration': 7.826}, {'end': 574.541, 'text': "So I'm going to show you, I'm going to rewrite this particular example using async and await instead of the dot then method.", 'start': 566.696, 'duration': 7.845}, {'end': 579.905, 'text': "And I will also refer you to some other videos I've made that go into these keywords with a bit more depth.", 'start': 574.962, 'duration': 4.943}, {'end': 582.426, 'text': "Let's first add some error handling.", 'start': 580.385, 'duration': 2.041}, {'end': 587.988, 'text': 'One of the nice things about working with chaining promises that we have fetch, then this, then this, then.', 'start': 582.506, 'duration': 5.482}, {'end': 590.488, 'text': 'this is an error can happen anywhere throughout there.', 'start': 587.988, 'duration': 2.5}, {'end': 595.01, 'text': "And I don't have to handle each error in a specific way with each part of that sequence.", 'start': 590.729, 'duration': 4.281}, {'end': 597.351, 'text': 'I can just put at the very end .', 'start': 595.27, 'duration': 2.081}, {'end': 598.431, 'text': 'catch So like .', 'start': 597.351, 'duration': 1.08}, {'end': 602.412, 'text': 'then, which handles the resolution of the promise, .', 'start': 598.431, 'duration': 3.981}, {'end': 606.794, 'text': 'catch handles when stuff goes wrong during that promise.', 'start': 602.412, 'duration': 4.382}], 'summary': 'Introducing async and await for handling promises, adding error handling using catch, and demonstrating the advantages of these new features.', 'duration': 63.372, 'max_score': 543.422, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/tc8DU14qX6I/pics/tc8DU14qX6I543422.jpg'}, {'end': 926.095, 'src': 'embed', 'start': 893.956, 'weight': 3, 'content': [{'end': 895.798, 'text': 'But as a little exercise, you might try some things.', 'start': 893.956, 'duration': 1.842}, {'end': 898.8, 'text': 'For example, could you fetch more than one image?', 'start': 895.858, 'duration': 2.942}, {'end': 901.901, 'text': 'What if you had an array of images??', 'start': 899.72, 'duration': 2.181}, {'end': 905.003, 'text': 'What if your file was not an image file?', 'start': 902.422, 'duration': 2.581}, {'end': 907.144, 'text': 'but maybe it was just a plain text file?', 'start': 905.003, 'duration': 2.141}, {'end': 910.807, 'text': 'Could you put the text that was in that file in a paragraph element?', 'start': 907.445, 'duration': 3.362}, {'end': 912.988, 'text': 'So try one or two of those exercises.', 'start': 911.087, 'duration': 1.901}, {'end': 920.012, 'text': "I will also include in the GitHub repository that's associated with this video series, I will include solutions to those two exercises.", 'start': 913.088, 'duration': 6.924}, {'end': 926.095, 'text': 'So try multiple images, try a text file, and see if you can get those to appear in your web page.', 'start': 920.312, 'duration': 5.783}], 'summary': 'Exercises include fetching multiple images and text files, with solutions available in the associated github repository.', 'duration': 32.139, 'max_score': 893.956, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/tc8DU14qX6I/pics/tc8DU14qX6I893956.jpg'}], 'start': 524.032, 'title': 'Using async and await with fetch', 'summary': 'Discusses handling errors in promises using .catch and introducing the new javascript keywords async and await to handle promises in a more readable and elegant way. it also demonstrates how to use async and await to condense and improve the readability of code when making asynchronous fetch requests, resulting in a condensed code of three lines and providing exercises for the audience.', 'chapters': [{'end': 642.504, 'start': 524.032, 'title': 'Handling errors and introducing async/await in javascript', 'summary': 'Discusses handling errors in promises using .catch and introducing the new javascript keywords async and await to handle promises in a more readable and elegant way.', 'duration': 118.472, 'highlights': ['The chapter discusses handling errors using .catch in promises, allowing for a more concise way to handle errors in the promise sequence.', 'Introducing the new JavaScript keywords async and await, which provide a more readable and elegant way to handle promises compared to the dot then method.']}, {'end': 928.477, 'start': 643.525, 'title': 'Using async and await with fetch', 'summary': 'Demonstrates how to use async and await to condense and improve the readability of code when making asynchronous fetch requests, resulting in a condensed code of three lines and handling errors. additionally, it mentions future topics on using fetch with a dataset and provides exercises for the audience.', 'duration': 284.952, 'highlights': ['Demonstrates how to use async and await to condense and improve the readability of code when making asynchronous fetch requests. Condensed multiple lines of code into three lines, improving readability and handling errors.', 'Mentions future topics on using fetch with a dataset and provides exercises for the audience to try, such as fetching multiple images and working with a plain text file. Future topics include using fetch with a dataset, along with exercises for the audience to practice fetching multiple images and working with plain text files.']}], 'duration': 404.445, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/tc8DU14qX6I/pics/tc8DU14qX6I524032.jpg', 'highlights': ['Introducing the new JavaScript keywords async and await, providing a more readable and elegant way to handle promises compared to the dot then method.', 'Demonstrates how to use async and await to condense and improve the readability of code when making asynchronous fetch requests, resulting in a condensed code of three lines and providing exercises for the audience.', 'The chapter discusses handling errors using .catch in promises, allowing for a more concise way to handle errors in the promise sequence.', 'Mentions future topics on using fetch with a dataset and provides exercises for the audience to try, such as fetching multiple images and working with a plain text file.']}], 'highlights': ['The Web Fetch API is a versatile function that allows fetching data and images from various sources, serving as the foundation for building other examples involving graphing data and retrieving weather information.', 'Introducing the new JavaScript keywords async and await, providing a more readable and elegant way to handle promises compared to the dot then method.', "The chapter introduces the concept of making HTTP requests, including get and post requests, and highlights Fetch's ability to both retrieve and send data.", "The tutorial introduces JavaScript promises and demonstrates their usage in handling asynchronous events, including 'then' method usage and promise chaining.", 'Explains the steps involved in using Fetch, such as calling the fetch function with the resource path, dealing with the response using promises, and completing the data stream in formats like JSON and blobs.', 'The chapter covers using fetch to retrieve an image and demonstrates the process of creating an HTML img element, adding JavaScript code, and utilizing the fetch function.', 'Demonstrates how to use async and await to condense and improve the readability of code when making asynchronous fetch requests, resulting in a condensed code of three lines and providing exercises for the audience.', 'The speaker demonstrates the asynchronous nature of the fetch function and the use of console.log and live server for real-time observation.', 'In the tutorial, a basic example of using the Web Fetch API to fetch a rainbow image and display it on the web page is demonstrated.', 'The process involves converting the response data into a blob and utilizing the create object URL function to display the image in the expected format.', 'The Fetch Web API is best learned on the Mozilla Developer Network site, providing comprehensive documentation for JavaScript and browser-related tasks.', 'The chapter discusses handling errors using .catch in promises, allowing for a more concise way to handle errors in the promise sequence.', 'Mentions future topics on using fetch with a dataset and provides exercises for the audience to try, such as fetching multiple images and working with a plain text file.']}