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skip to content featured my upcoming conferences and workshops published on february 21, 2018 july 29, 2018 by yakov fain leave a comment in november-december of 2018, i’ll be participating in the following conferences: 1. devoxx ukraine in kiev 2. dxworldexpo in new york 3. angular summit clearwater, florida advertisements categories angular , typescript learning typescript: structural vs nominal typing systems published on july 11, 2018 july 11, 2018 by yakov fain leave a comment after completing the second edition of the book “ angular development with typescript “, my colleague anton moiseev and i started working on yet another book for manning. this one will be called “get programming with typescript” and its tentative table of contents is available here . this book will cover the main syntax elements of the typescript language, and to make the book more interesting, we’ll also develop a blockchain app. meanwhile, i’ll start a series of blogs on the typescript-related topics. this one is about typescript’s structural type system. a primitive type has just a name (e.g. number) while a more complex type like an object or class has a name and some structure represented by properties (e.g. a class customer has properties name and address). how would you know if two types are the same or not? in some languages (e.g. java) two types are the same if they have the same names, which represents a nominal type system . in java, the last wouldn’t compile because the names of the classes are not the same even though they have the same structure: class person { string name; } class customer { string name; } customer cust = new person(); // compiler's error but typescript and some other languages use the structural type system. in the following code snippet i re-wrote the above code snippet in typescript: class person { name: string; } class customer { name: string; } const cust: customer = new person(); // no errors this code doesn’t report any errors because typescript uses structural type systems, and since both classes person and customer have the same structure, it’s ok to assign an instance of one class to a variable of another. moreover, you can use object literals to create objects and assign them to class-typed variables or constants as long as the shape of the object literal is the same. the following code snippet will compile without errors: class person { name: string; } class customer { name: string; } const cust: customer = { name: 'mary' }; const pers: person = { name: 'john' }; our classes didn’t define any methods, but if both of them would define a method(s) that has the same signature (name, arguments, and the return type) they would also be compatible. what if the structure of person and customer are not exactly the same? let’s add a property age to the class person as is the following listing: class person { name: string; age: number; // 1 } class customer { name: string; } const cust: customer = new person(); // still no errors 1 we’ve added this property still no errors! typescript sees that person and customer have the same shape . we want to use the constant of type customer (it has the property name) to point at the object of type person (it also has the property name). follows the link https://bit.ly/2mbhvph and you’ll see this code in typescript playground (a repl to try code snippets in typescript and compile them into javascript). click ctrl-space after the dot in cust. and you’ll see that only the name property is available even though the class person has also the property age. homework: can the class customer have more properties than person? in the previous code snippet, the class person had more properties than customer and the code compiled without errors. what if the class customer has more properties than person? would the following code compile? explain your answer. class person { name: string; } class customer { name: string; age: number; } const cust: customer = new person(); categories typescript how i migrated a dozen of projects to angular 6 published on may 16, 2018 may 21, 2018 by yakov fain 4 comments in this article, i’ll share with you my experience of upgrading more than a dozen of anguar 5 projects to angular 6. these projects were small to medium in size, but they used lots of various angular features because these are the projects from the second edition of our angular book . many of these projects had multiple apps configured in the file .angular-cli.json, and they were automatically migrated into the new project structure as defined in the new configuration file angular.json. first of all, there’s the site https://update.angular.io that gives you an idea of how to do the upgrade from version x to version y, and you certainly need to read the instructions there first. but the devil is in the detail, right? theoretically, the upgrade should be a 1-2-3 process that consists of the following three steps: 1. npm install @angular/cli@latest –save-dev run this command in your project’s dir, to upgrade (and install) the latest angular cli version in the devdependencies section of package.json. this command shouldn’t need @latest, but it does. 2. ng update @angular/cli run this command to convert the project configuration file .angular-cli.json into angular.json introduced by angular 6.it also will update testing and tslint config files. 3. ng update @angular/core run this command to upgrade all angular dependencies in the package.json file (except angular material and angular flex layout, if used). what else is needed on my computer, i had angular cli 6 install globally, and my typical project had the line “typescript”: “~2.4.2” in devdependency section of package.json. before running and upgrade steps, bump up the typescript compiler version in your project or you’ll get an error “@angular/compiler-cli” has an incompatible peer dependency to “typescript” during the step 3. start any project upgrade with manually changing this dependency to “typescript”: “~2.7.2”. if you still see that error, delete the node_module directory and re-run step 3. if you use the angular material library, run ng update @angular/material to update its dependencies in package.json. if you use the flex layout library, modify its version to 6.0.0-beta15 or later prior to running ng update @angular/core . your project’s .angular-cli.json might include the file favicon.ico in the asset’s property that’s not used in your app. angular 5 would still launch your app even if this file was missing. in angular 6, you need to explicitly remove all occurrences of favicon.ico in the newly generated angular.json. after migration, i noticed some strange behavior in the ui rendering, which seems like a bug. in some of my apps, i had the following html in the component templates: <a [routerlink]="['/']">home</a> <a [routerlink]="['/product']">product</a> in angular 5, it rendered just fine, but after migration to angular 6, the browser rendered both links without the space between them: homeproduct. adding &nbsp; after the first anchor tag helped. i thought it might be related to the angular compiler’s option preservewhitespaces, but it didn’t. starting from typescript 2.7, you may need to take care of the error ts2564: property ‘soandso’ has no initializer and is not definitely assigned in the constructor . for example, the following class variable declaration won’t compile: product: product[]; either set the typescript compiler’s option strictpropertyinitialization to false or explicitly initialize class variables, e.g. product: product[] = []; upgrading your app to rxjs 6 during the upgrade, i spent the most time updating the code related to breaking changes in rxjs 6. your updated package.json will include the dependency “rxjs-compat”: “^6.0.0-rc.0” after step 3. at the time of this writing, the current version of rxjs-compat is 6.1.0, so if you decide to keep rxjs-compat, update its version in package.json and reinstall

URL analysis for yakovfain.com

https://yakovfain.com/2018/05/12/starting-a-new-book-on-typescript/
https://yakovfain.com/2014/12/29/pushing-data-to-multiple-websocket-clients-from-a-java-server/
https://yakovfain.com/developing-web-apps-with-angular-2-and-typescript-essentials/
https://yakovfain.com/2018/02/28/whats-coming-in-angular-6/
https://yakovfain.com/2018/05/16/how-i-migrated-a-dozen-of-projects-to-angular-6/#comments
https://yakovfain.com/2018/03/29/angular-when-using-ngrx-is-an-overkill/#comments
https://yakovfain.com/2018/05/02/rxjs-essentials-part-9-dealing-with-breaking-changes-in-rxjs-6/
https://yakovfain.com/2018/05/12/starting-a-new-book-on-typescript/#respond
https://yakovfain.com/2017/09/04/rxjs-essentials-part-4-using-subject/
https://yakovfain.com/category/rxjs/
https://yakovfain.com/2018/07/11/learning-typescript-structural-vs-nominal-typing-system/
https://yakovfain.com/about/
https://yakovfain.com/2018/05/02/rxjs-essentials-part-9-dealing-with-breaking-changes-in-rxjs-6/#respond
https://yakovfain.com/category/ngrx/
https://yakovfain.com/2017/06/24/my-presentations-and-workshops-in-2017

Whois Information

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Domain Name: YAKOVFAIN.COM
Registry Domain ID: 1681266925_DOMAIN_COM-VRSN
Registrar WHOIS Server: whois.wildwestdomains.com
Registrar URL: http://www.wildwestdomains.com
Updated Date: 2018-09-09T09:53:48Z
Creation Date: 2011-10-09T16:39:08Z
Registry Expiry Date: 2019-10-09T16:39:08Z
Registrar: Wild West Domains, LLC
Registrar IANA ID: 440
Registrar Abuse Contact Email: [email protected]
Registrar Abuse Contact Phone: 480-624-2505
Domain Status: clientDeleteProhibited https://icann.org/epp#clientDeleteProhibited
Domain Status: clientRenewProhibited https://icann.org/epp#clientRenewProhibited
Domain Status: clientTransferProhibited https://icann.org/epp#clientTransferProhibited
Domain Status: clientUpdateProhibited https://icann.org/epp#clientUpdateProhibited
Name Server: NS1.WORDPRESS.COM
Name Server: NS2.WORDPRESS.COM
DNSSEC: unsigned
URL of the ICANN Whois Inaccuracy Complaint Form: https://www.icann.org/wicf/
>>> Last update of whois database: 2018-12-24T14:21:23Z <<<

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  REGISTRAR Wild West Domains, LLC

SERVERS

  SERVER com.whois-servers.net

  ARGS domain =yakovfain.com

  PORT 43

  TYPE domain

DOMAIN

  NAME yakovfain.com

  CHANGED 2018-09-09

  CREATED 2011-10-09

STATUS
clientDeleteProhibited https://icann.org/epp#clientDeleteProhibited
clientRenewProhibited https://icann.org/epp#clientRenewProhibited
clientTransferProhibited https://icann.org/epp#clientTransferProhibited
clientUpdateProhibited https://icann.org/epp#clientUpdateProhibited

NSERVER

  NS1.WORDPRESS.COM 198.181.116.9

  NS2.WORDPRESS.COM 198.181.117.9

  REGISTERED yes

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