muerwre/muerwre.github.io
1
0
Fork 0
mirror of https://github.com/muerwre/muerwre.github.io.git synced 2025-04-25 02:46:39 +07:00
Code Issues Projects Releases Packages Wiki Activity Actions
muerwre.github.io/api/_content/query/iZIUw8pCoM.json
muerwre d8d73b7f99 commit 949164f6a2 
Author: Fedor Katurov <gotham48@gmail.com>
Date:   Thu Nov 3 20:46:37 2022 +0600

    fixed buttons placement
2022-11-04 12:32:54 +00:00

1 line
No EOL
11 KiB
JSON
Raw Blame History

{"_path":"/typescript/type-guards","_dir":"typescript","_draft":false,"_partial":false,"_locale":"en","_empty":false,"title":"Type Guards","description":"Useful for type checking at compile and run time:","excerpt":{"type":"root","children":[{"type":"element","tag":"p","props":{},"children":[{"type":"text","value":"Useful for type checking at compile and run time:"}]},{"type":"element","tag":"code","props":{"code":"function isFish(pet: Fish | Bird): pet is Fish {\n return (pet as Fish).swim !== undefined;\n}\n","language":"typescript"},"children":[{"type":"element","tag":"pre","props":{},"children":[{"type":"element","tag":"code","props":{"__ignoreMap":""},"children":[{"type":"text","value":"function isFish(pet: Fish | Bird): pet is Fish {\n return (pet as Fish).swim !== undefined;\n}\n"}]}]}]},{"type":"element","tag":"p","props":{},"children":[{"type":"text","value":"Usage:"}]},{"type":"element","tag":"code","props":{"code":"const pet = getSmallPet();\n \nif (isFish(pet)) {\n pet.swim();\n} else {\n pet.fly();\n}\n","language":"typescript"},"children":[{"type":"element","tag":"pre","props":{},"children":[{"type":"element","tag":"code","props":{"__ignoreMap":""},"children":[{"type":"text","value":"const pet = getSmallPet();\n \nif (isFish(pet)) {\n pet.swim();\n} else {\n pet.fly();\n}\n"}]}]}]}]},"body":{"type":"root","children":[{"type":"element","tag":"p","props":{},"children":[{"type":"text","value":"Useful for type checking at compile and run time:"}]},{"type":"element","tag":"code","props":{"code":"function isFish(pet: Fish | Bird): pet is Fish {\n return (pet as Fish).swim !== undefined;\n}\n","language":"typescript"},"children":[{"type":"element","tag":"pre","props":{},"children":[{"type":"element","tag":"code","props":{"__ignoreMap":""},"children":[{"type":"element","tag":"span","props":{"class":"line"},"children":[{"type":"element","tag":"span","props":{"class":"ct-c2e37e"},"children":[{"type":"text","value":"function"}]},{"type":"element","tag":"span","props":{"class":"ct-c92af3"},"children":[{"type":"text","value":" "}]},{"type":"element","tag":"span","props":{"class":"ct-fa20b9"},"children":[{"type":"text","value":"isFish"}]},{"type":"element","tag":"span","props":{"class":"ct-c92af3"},"children":[{"type":"text","value":"("}]},{"type":"element","tag":"span","props":{"class":"ct-27f766"},"children":[{"type":"text","value":"pet"}]},{"type":"element","tag":"span","props":{"class":"ct-46ef93"},"children":[{"type":"text","value":":"}]},{"type":"element","tag":"span","props":{"class":"ct-c92af3"},"children":[{"type":"text","value":" "}]},{"type":"element","tag":"span","props":{"class":"ct-666d80"},"children":[{"type":"text","value":"Fish"}]},{"type":"element","tag":"span","props":{"class":"ct-c92af3"},"children":[{"type":"text","value":" "}]},{"type":"element","tag":"span","props":{"class":"ct-46ef93"},"children":[{"type":"text","value":"|"}]},{"type":"element","tag":"span","props":{"class":"ct-c92af3"},"children":[{"type":"text","value":" "}]},{"type":"element","tag":"span","props":{"class":"ct-666d80"},"children":[{"type":"text","value":"Bird"}]},{"type":"element","tag":"span","props":{"class":"ct-c92af3"},"children":[{"type":"text","value":")"}]},{"type":"element","tag":"span","props":{"class":"ct-46ef93"},"children":[{"type":"text","value":":"}]},{"type":"element","tag":"span","props":{"class":"ct-c92af3"},"children":[{"type":"text","value":" "}]},{"type":"element","tag":"span","props":{"class":"ct-27f766"},"children":[{"type":"text","value":"pet"}]},{"type":"element","tag":"span","props":{"class":"ct-c92af3"},"children":[{"type":"text","value":" "}]},{"type":"element","tag":"span","props":{"class":"ct-46ef93"},"children":[{"type":"text","value":"is"}]},{"type":"element","tag":"span","props":{"class":"ct-c92af3"},"children":[{"type":"text","value":" "}]},{"type":"element","tag":"span","props":{"class":"ct-666d80"},"children":[{"type":"text","value":"Fish"}]},{"type":"element","tag":"span","props":{"class":"ct-c92af3"},"children":[{"type":"text","value":" {"}]}]},{"type":"element","tag":"span","props":{"class":"line"},"children":[{"type":"element","tag":"span","props":{"class":"ct-590d0c"},"children":[{"type":"text","value":" "}]},{"type":"element","tag":"span","props":{"class":"ct-2db2ee"},"children":[{"type":"text","value":"return"}]},{"type":"element","tag":"span","props":{"class":"ct-590d0c"},"children":[{"type":"text","value":" ("}]},{"type":"element","tag":"span","props":{"class":"ct-6a8c76"},"children":[{"type":"text","value":"pet"}]},{"type":"element","tag":"span","props":{"class":"ct-590d0c"},"children":[{"type":"text","value":" "}]},{"type":"element","tag":"span","props":{"class":"ct-2db2ee"},"children":[{"type":"text","value":"as"}]},{"type":"element","tag":"span","props":{"class":"ct-590d0c"},"children":[{"type":"text","value":" "}]},{"type":"element","tag":"span","props":{"class":"ct-0e991b"},"children":[{"type":"text","value":"Fish"}]},{"type":"element","tag":"span","props":{"class":"ct-590d0c"},"children":[{"type":"text","value":")."}]},{"type":"element","tag":"span","props":{"class":"ct-6a8c76"},"children":[{"type":"text","value":"swim"}]},{"type":"element","tag":"span","props":{"class":"ct-590d0c"},"children":[{"type":"text","value":" "}]},{"type":"element","tag":"span","props":{"class":"ct-2db2ee"},"children":[{"type":"text","value":"!=="}]},{"type":"element","tag":"span","props":{"class":"ct-590d0c"},"children":[{"type":"text","value":" "}]},{"type":"element","tag":"span","props":{"class":"ct-3e8934"},"children":[{"type":"text","value":"undefined"}]},{"type":"element","tag":"span","props":{"class":"ct-590d0c"},"children":[{"type":"text","value":";"}]}]},{"type":"element","tag":"span","props":{"class":"line"},"children":[{"type":"element","tag":"span","props":{"class":"ct-590d0c"},"children":[{"type":"text","value":"}"}]}]}]}]}]},{"type":"element","tag":"p","props":{},"children":[{"type":"text","value":"Usage:"}]},{"type":"element","tag":"code","props":{"code":"const pet = getSmallPet();\n \nif (isFish(pet)) {\n pet.swim();\n} else {\n pet.fly();\n}\n","language":"typescript"},"children":[{"type":"element","tag":"pre","props":{},"children":[{"type":"element","tag":"code","props":{"__ignoreMap":""},"children":[{"type":"element","tag":"span","props":{"class":"line"},"children":[{"type":"element","tag":"span","props":{"class":"ct-78524c"},"children":[{"type":"text","value":"const"}]},{"type":"element","tag":"span","props":{"class":"ct-590d0c"},"children":[{"type":"text","value":" "}]},{"type":"element","tag":"span","props":{"class":"ct-c0eb17"},"children":[{"type":"text","value":"pet"}]},{"type":"element","tag":"span","props":{"class":"ct-590d0c"},"children":[{"type":"text","value":" "}]},{"type":"element","tag":"span","props":{"class":"ct-2db2ee"},"children":[{"type":"text","value":"="}]},{"type":"element","tag":"span","props":{"class":"ct-590d0c"},"children":[{"type":"text","value":" "}]},{"type":"element","tag":"span","props":{"class":"ct-989a2e"},"children":[{"type":"text","value":"getSmallPet"}]},{"type":"element","tag":"span","props":{"class":"ct-590d0c"},"children":[{"type":"text","value":"();"}]}]},{"type":"element","tag":"span","props":{"class":"line"},"children":[{"type":"element","tag":"span","props":{"class":"ct-590d0c"},"children":[{"type":"text","value":" "}]}]},{"type":"element","tag":"span","props":{"class":"line"},"children":[{"type":"element","tag":"span","props":{"class":"ct-2db2ee"},"children":[{"type":"text","value":"if"}]},{"type":"element","tag":"span","props":{"class":"ct-590d0c"},"children":[{"type":"text","value":" ("}]},{"type":"element","tag":"span","props":{"class":"ct-989a2e"},"children":[{"type":"text","value":"isFish"}]},{"type":"element","tag":"span","props":{"class":"ct-590d0c"},"children":[{"type":"text","value":"("}]},{"type":"element","tag":"span","props":{"class":"ct-6a8c76"},"children":[{"type":"text","value":"pet"}]},{"type":"element","tag":"span","props":{"class":"ct-590d0c"},"children":[{"type":"text","value":")) {"}]}]},{"type":"element","tag":"span","props":{"class":"line"},"children":[{"type":"element","tag":"span","props":{"class":"ct-590d0c"},"children":[{"type":"text","value":" "}]},{"type":"element","tag":"span","props":{"class":"ct-6a8c76"},"children":[{"type":"text","value":"pet"}]},{"type":"element","tag":"span","props":{"class":"ct-590d0c"},"children":[{"type":"text","value":"."}]},{"type":"element","tag":"span","props":{"class":"ct-989a2e"},"children":[{"type":"text","value":"swim"}]},{"type":"element","tag":"span","props":{"class":"ct-590d0c"},"children":[{"type":"text","value":"();"}]}]},{"type":"element","tag":"span","props":{"class":"line"},"children":[{"type":"element","tag":"span","props":{"class":"ct-590d0c"},"children":[{"type":"text","value":"} "}]},{"type":"element","tag":"span","props":{"class":"ct-2db2ee"},"children":[{"type":"text","value":"else"}]},{"type":"element","tag":"span","props":{"class":"ct-590d0c"},"children":[{"type":"text","value":" {"}]}]},{"type":"element","tag":"span","props":{"class":"line"},"children":[{"type":"element","tag":"span","props":{"class":"ct-590d0c"},"children":[{"type":"text","value":" "}]},{"type":"element","tag":"span","props":{"class":"ct-6a8c76"},"children":[{"type":"text","value":"pet"}]},{"type":"element","tag":"span","props":{"class":"ct-590d0c"},"children":[{"type":"text","value":"."}]},{"type":"element","tag":"span","props":{"class":"ct-989a2e"},"children":[{"type":"text","value":"fly"}]},{"type":"element","tag":"span","props":{"class":"ct-590d0c"},"children":[{"type":"text","value":"();"}]}]},{"type":"element","tag":"span","props":{"class":"line"},"children":[{"type":"element","tag":"span","props":{"class":"ct-590d0c"},"children":[{"type":"text","value":"}"}]}]}]}]}]},{"type":"element","tag":"style","children":[{"type":"text","value":".ct-989a2e{color:#D2A8FF}.ct-c0eb17{color:#79C0FF}.ct-78524c{color:#FF7B72}.ct-3e8934{color:#79C0FF}.ct-0e991b{color:#FFA657}.ct-6a8c76{color:#C9D1D9}.ct-2db2ee{color:#FF7B72}.ct-590d0c{color:#C9D1D9}.ct-666d80{color:#FFA657}.ct-46ef93{color:#FF7B72}.ct-27f766{color:#FFA657}.ct-fa20b9{color:#D2A8FF}.ct-c92af3{color:#C9D1D9}.ct-c2e37e{color:#FF7B72}.light .ct-c2e37e{color:#073642}.light .ct-c92af3{color:#657B83}.light .ct-fa20b9{color:#268BD2}.light .ct-27f766{color:#657B83}.light .ct-46ef93{color:#859900}.light .ct-666d80{color:#268BD2}.light .ct-590d0c{color:#657B83}.light .ct-2db2ee{color:#859900}.light .ct-6a8c76{color:#268BD2}.light .ct-0e991b{color:#268BD2}.light .ct-3e8934{color:#B58900}.light .ct-78524c{color:#073642}.light .ct-c0eb17{color:#268BD2}.light .ct-989a2e{color:#268BD2}"}]}],"toc":{"title":"","searchDepth":2,"depth":2,"links":[]}},"_type":"markdown","_id":"content:Typescript:Type guards.md","_source":"content","_file":"Typescript/Type guards.md","_extension":"md"}
Reference in a new issue View git blame Copy permalink