frontendmasters – JavaScript: The Recent Parts (2019)

Kyle Simpson is the author of the popular You Don’t Know JS book series. You will get up to speed with new features such as tagged template literals, destructuring, iterators, generators, and async.

This course is part of our Frontend Masters video subscription.

There is a table of contents. The introduction is about something.

Javascript has a new feature process. The time is 0:00:00. Javascript has a new feature process. Kyle Simpson gives context to the frustration with the fast pace of JavaScript’s evolution by talking about the dark ages of JavaScript and how the language has gotten to the present day feature process. Declarative javascript. There is a time and a place. Declarative javascript. Kyle explains the changes that are coming to the language. It’s not like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it Browser support and transpilers. The time is 00:13:50. Browser support and transpilers. Kyle assures developers that they will be supported when new features are implemented by introducing transpilers as a standard for the language. It’s not like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it There is a course overview. 00:19:06 There is a course overview. Kyle gives a road map for what the course will contain as part of the title.

Strings

There are template strings. The time is 00:22:14 There are template strings. Kyle introduces a way of introducing variables to strings. It’s not like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it There are templates. 00:37:44 There are templates. Kyle gives 888-353-1299 888-353-1299 888-353-1299 888-353-1299 888-353-1299 888-353-1299 888-353-1299 888-353-1299 888-353-1299 888-353-1299 888-353-1299 888-353-1299 888-353-1299 888-353-1299 888-353-1299 888-353-1299 888-353-1299 888-353-1299 888-353-1299 888-353-1299 888-353-1299 888-353-1299 888-353-1299 888-353-1299 888-353-1299 888-353-1299 888-353-1299 888-353-1299 888-353-1299 888-353-1299 888-353-1299 888-353-1299 888-353-1299 888-353-1299 888-353-1299 888-353-1299 888-353-1299 888-353-1299 888-353-1299 888-353-1299 888-353-1299 888-353-1299 888-353-1299 888-353-1299 888-353-1299 888-353-1299 888-353-1299 888-353-1299 888-353-1299 888-353-1299 888-353-1299 888-353-1299 888-353-1299 888-353-1299 888-353-1299 888-353-1299 It’s not like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it Applying templates. There is a time of 00:37:45 and a time of 00:42:47. Applying templates. Kyle shows an application that logs objects in the console. It’s not like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it There is a template exercise. 00:43:57 There is a template exercise. Students are told to use both template strings and tagged templates in their statement. There is a template solution. There was a time of 00:43:58 and 00:46:21. There is a template solution. Kyle codes the solution. It’s not like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it Padding and trimming are done. 00:46:22 -00:53:25 Padding and trimming are done. Kyle introduces string trimming.

There is a reconfiguration of the array.

DeTrademarkiaTrademarkias is aTrademarkiaTrademarkias is aTrademarkiaTrademarkias is aTrademarkias is aTrademarkias is aTrademarkias is aTrademarkias is aTrademarkias is aTrademarkias is aTrademarkias is aTrademarkias is aTrademarkias is aTrademarkias is aTrademarkias A:53:26 DeTrademarkiaTrademarkias is aTrademarkiaTrademarkias is aTrademarkiaTrademarkias is aTrademarkias is aTrademarkias is aTrademarkias is aTrademarkias is aTrademarkias is aTrademarkias is aTrademarkias is aTrademarkias is aTrademarkias is aTrademarkias is aTrademarkias Kyle gives an example of how it makes the code more neccesary. It’s not like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it The code is being refactored using destructuring. 01:05:06 The code is being refactored using destructuring. Kyle shows how to implement a conversation. It’s not like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it Spread Operator and Declaring Destructured Arrays. 01:17:44 Spread Operator and Declaring Destructured Arrays. Kyle introduces the spread operator to the example, and then goes on to explain how the example with de restructuring differs from the example without it. It’s not like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it Declaration and assignment. There is a time limit of 1:07:45 and 2:04:40. Declaration and assignment. Kyle explained the difference between declaration and assignment. It’s not like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it Comma separation. 01:29:07 Comma separation. Kyle shows how to remove a value when it’s returned. It’s not like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it There are Parameter Arrays. 01:29:08 There are Parameter Arrays. The concept of gracefully falling back when what was returned is null is demonstrated by Kyle. It’s not like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it There is a nested array. 01:40:41 There is a nested array. Kyle shows how to access a returned data structure’s values when there is a nested array.

There is object structuring.

There is object structuring. The time was 01:40:42 There is object structuring. Kyle shows how to use the spread operator. It’s not like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it There is an object assignment. The time was 01:45. There is an object assignment. When assignment is separate from declaration, Javascript distributes blocks. It’s not like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it The default assignment is object. 01:45 The default assignment is object. When the values are null, Kyle shows how to destructure. It’s not like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it Nested object structuring. 01:57:29 Nested object structuring. When it is known that there are objects, Kyle shows how to access a returned data structure’s values. It’s not like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it There is a default assignment Q&A. The time is 01:57:30 There is a default assignment Q&A. There is a question about how to give a default assignment. It’s not like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it There are Parameter objects. 02:04:08 There are Parameter objects. Kyle shows how to restructure a function signature with an object. It’s not like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it There is a nested object and an array of nested objects. 02:04:09 There is a nested object and an array of nested objects. When it is known that there are both objects and arrrays, Kyle shows how to access a returned data structure’s values.

Further restructuring is on the way.

Get it immediately. The recent parts of javascript.

The arguments are named. 2:07:39 The arguments are named. Kyle shows a method of making the code more readable. It’s not like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it Restructuring There is a time and a place. Restructuring A method to mix methods is introduced by Kyle. It’s not like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it There is a restructuring exercise. The time was 02:17:39 to 02:19:08 There is a restructuring exercise. The students are told to restructure the parameters. There is a restructuring solution. The time was 02:19:09 There is a restructuring solution. Kyle codes the solution.

There are array methods.

Find, findIndex, and includes. The time was 02:26:12. Find, findIndex, and includes. Kyle introduces new methods for searching an array. Map of flat and flatMap. 02:34:26 Map of flat and flatMap. New array methods.flat and.flatmap are introduced by Kyle.

Iterators and Generators.

Iterators. There is a time and a place. Iterators. Kyle walks through an example where an iterator is instantialized and a result is produced. It’s not like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it Declarative Iterators. 02:39:09 Declarative Iterators. Kyle introduces the new built in key word of and spread operator as a way to make changes to data structures. It’s not like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it There is no data structure without iterators. The time was 02:43:33 There is no data structure without iterators. Kyle shows a strategy for overcoming the issues that arise when attempting to change a data structure. It’s not like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it Generators are used for Generators are used for Generators are used for Generators are used for Generators are used for Generators are used for Generators are used for Generators are used for Generators are used for Generators are used for Generators are used for Generators are used for Generators are used for Generators are used for Generators are 02:58:41 Generators are used for Generators are used for Generators are used for Generators are used for Generators are used for Generators are used for Generators are used for Generators are used for Generators are used for Generators are used for Generators are used for Generators are used for Generators are used for Generators are used for Generators are Kyle shows how to use generators to make changes to data structures. It’s not like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it Iterator and generator exercises. 02:58:42 Iterator and generator exercises. Students are told to use an iterator and generator to log lucky numbers. The solution for iterator and generator. The time was 03:01:32 to 03:05:43. The solution for iterator and generator. Kyle codes the solution.

There are regular expressions.

Look ahead and behind. 03:05:44 Look ahead and behind. Kyle first reviews look aheads, then introduces the new look behinds. It’s not like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it They are named capture groups. 03:11:31 They are named capture groups. Kyle shows how to organize regular expressions and make them readable. Dotall Mode. 3:08:20 Dotall Mode. Kyle shows how to use the dotall mode. It’s not like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it The exercise is called regex. 03:18:06 The exercise is called regex. Students are told to use all three of the features learned in the last few sections, as well as earlier lessons to log selected portions of a poem provided by Kyle. The solution is called regex. There was a time when there was a time when there was a time when there was a time when there was a time when there was a time when there was a time when there was a time when there was a time when there was a time when there was a time when there was a The solution is called regex. Kyle codes the solution.

A wait.

sync functions There was a time when there was a time when there was a time when there was a time when there was a time when there was a time when there was a time when there was a time when there was a time when there was a time when there was a time when there was a sync functions Kyle explains how the async function accomplishes what the async function accomplished by giving context to what was done before the availability of the sync-async pattern. It’s not like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it A wait exercise. 03:36:44 A wait exercise. Students are told to build an async function where files are given to the function by a mock AJAX call, and are log in the order that they are received. A wait solution. 03:40:30 A wait solution. Kyle demonstrates a common mistake that students are likely to make by coding the solution to the exercise. It’s not like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it Async Iteration. There is a time of 03:40:31 and a time of 03:44:18. Async Iteration. Kyle gives up a library that fills the gap in the language and explains why await cannot be used in a regular function. It’s not like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it Async function problems. 03:55:44 Async function problems. Kyle exposes the issues with async functions, including that it only accepts promises and causes starvation. It’s not like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it Async Generators have a yield. 03:20 Async Generators have a yield. Kyle introduces a new function type that allows for yield and await in the same function. It’s not like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it’s like it Async Generators Iteration. There was a time of 04:00:41 and 04:08:00. Async Generators Iteration. Kyle explains that async generators are the last part of async generators.

Wrap-Up

Wrap up. 04:09:59 Wrap up. The audience should be encouraged by the future of Javascript.