2e:null 2f:["$","title",null,{"children":"Connecting Datascript with Observable | Olivier Lange | Observable"}] 34:[] 32:{"id":"ce4a14cade9dee1d","slug":"connecting-datascript-with-observable","title":"Connecting Datascript with Observable","thumbnail":"fd3f1fd164b368da602ad782ee25bcb4da2034098de8d2ffc26d6d4998c418d9","access_level":"public","create_time":"$D2022-06-08T20:01:43.182Z","update_time":"$D2022-07-27T22:59:45.667Z","view_time":null,"first_public_time":"$D2022-06-08T20:32:57.427Z","has_unpublished_edits":null,"fork":false,"stars":1,"starred":false,"owner":{"type":"team","id":"3febe0974a7138cb","login":"olange","name":"Olivier Lange","avatar_url":"https://avatars-next.observableusercontent.com/52639e5630d4e3e4e2772fe77680883002a0b9352d8dd7a649dbcb67b1e1fb3a","tier":"starter_2024"},"version":232,"publish_version":232,"role":null,"authored":false,"authors":[{"type":"individual","id":"deea7e78e25caede","login":"olange","name":"Olivier Lange","avatar_url":"https://avatars-next.observableusercontent.com/05f7623b298d024c8fdb05b03c59e2d52fe0349b7c85bced7cdea69e7dcb847a","tier":null}],"members":[{"type":"individual","id":"deea7e78e25caede","login":"olange","name":"Olivier Lange","avatar_url":"https://avatars-next.observableusercontent.com/05f7623b298d024c8fdb05b03c59e2d52fe0349b7c85bced7cdea69e7dcb847a","tier":null,"role":"editor"}],"comments":[],"custom_thumbnail":false,"trashed":false,"lapsed":null,"subscribed":null,"forks":1,"collection":{"id":"f0ba41a5a55ae7f0","slug":"gong-fu-i-o","title":"Gōng-fu I/O","owner":{"id":"3febe0974a7138cb","login":"olange","name":"Olivier Lange"}},"type":"notebook","body":{"title":"Connecting Datascript with Observable","cells":[{"id":0,"value":"# Connecting Datascript with Observable\n\nImports the JS release and façade of [Datascript](https://github.com/tonsky/datascript) in this Observable notebook, and uses it to execute a few sample statements against Datascript's [JS API](https://github.com/tonsky/datascript/wiki/Javascript-API). The sample statements were taken from its [JS test suite](https://github.com/tonsky/datascript/blob/master/test/js/tests.js).\n\nA few resources to learn more about Datascript:
\n* [« A shallow dive into DataScript internals »](https://tonsky.me/blog/datascript-internals/), Nikita Tonsky, 23.02.2015\n* [@tonsky/datascript › Wiki › Getting started](https://github.com/tonsky/datascript/wiki/Getting-started)\n* [@tonsky/datascript › Wiki › API Overview](https://github.com/tonsky/datascript/wiki/API-overview)","pinned":false,"hidden":false,"mode":"md","author":"$undefined","summary":"$undefined","output":"","database":"$undefined"},{"id":21,"value":"## Query the database","pinned":false,"hidden":false,"mode":"md","author":"$undefined","summary":"$undefined","output":"","database":"$undefined"},{"id":46,"value":"

Names of entities with EID 1 and 2:
\n [ ${namesOfTwoEntities.map(\n e => `*Object* { *name*: ${e.name} }`).join( ', ') } ]

\n\n

Relations in DB2 matching query:
\n [ ${relsInDB2.map(\n e => `[ ${e[0]}, ${e[1]} ]`).join( ', ')} ]

\n\n

Relations in DB1 matching query:
\n [ ${relsInDB1.map(\n e => `[ ${e[0]}, ${e[1]} ]`).join( ', ')} ]

","pinned":false,"hidden":false,"mode":"md","author":"$undefined","summary":"$undefined","output":"","database":"$undefined"},{"id":225,"value":"result = ds.q( `[:find ?e ?n :where [?e \"name\" ?n]]`, db2)","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":121,"value":"namesOfTwoEntities = ds.pull_many( db2, '[ \"name\" ]', [ 1, 2 ])","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":31,"value":"relsInDB2 = ds.q( queryEntitiesWithNameAndAge, db2);","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":23,"value":"relsInDB1 = ds.q( queryEntitiesWithNameAndAge, db1);","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":100,"value":"queryEntitiesWithNameAndAge = '[:find ?n ?a :where [?e \"name\" ?n] [?e \"age\" ?a]]'","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":19,"value":"## Setup a database","pinned":false,"hidden":false,"mode":"md","author":"$undefined","summary":"$undefined","output":"","database":"$undefined"},{"id":15,"value":"db2 = ds.db_with( db1, [ {\":db/id\": 2, \"name\": igor.name, \"age\": igor.age } ]);","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":13,"value":"db1 = ds.db_with( db0, [ [\":db/add\", 1, \"name\", ivan.name], [\":db/add\", 1, \"age\", ivan.age] ]);","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":11,"value":"db0 = ds.empty_db();","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":80,"value":"## Some reference data","pinned":false,"hidden":false,"mode":"md","author":"$undefined","summary":"$undefined","output":"","database":"$undefined"},{"id":77,"value":"ivan = new Person( \"Ivan\", 17)","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":74,"value":"igor = new Person( \"Igor\", 35)","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":71,"value":"class Person {\n constructor( name, age) {\n this.name = name;\n this.age = age;\n }\n}","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":6,"value":"## Dependencies","pinned":false,"hidden":false,"mode":"md","author":"$undefined","summary":"$undefined","output":"","database":"$undefined"},{"id":8,"value":"ds = import('https://cdn.skypack.dev/datascript@1.3.13')","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"}],"files":"$W34","stdlib":"1","titling":"auto"}} 33:"$32:body"