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 7c41f536b6 commit 2e92e2e809 
Author: Fedor Katurov <gotham48@gmail.com>
Date:   Fri Nov 11 13:59:06 2022 +0600

    fixed writings on headers
2022-11-11 08:00:57 +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-25eac6"},"children":[{"type":"text","value":"function"}]},{"type":"element","tag":"span","props":{"class":"ct-c22dcc"},"children":[{"type":"text","value":" "}]},{"type":"element","tag":"span","props":{"class":"ct-117e1f"},"children":[{"type":"text","value":"isFish"}]},{"type":"element","tag":"span","props":{"class":"ct-c22dcc"},"children":[{"type":"text","value":"("}]},{"type":"element","tag":"span","props":{"class":"ct-69efe7"},"children":[{"type":"text","value":"pet"}]},{"type":"element","tag":"span","props":{"class":"ct-a235f1"},"children":[{"type":"text","value":":"}]},{"type":"element","tag":"span","props":{"class":"ct-c22dcc"},"children":[{"type":"text","value":" "}]},{"type":"element","tag":"span","props":{"class":"ct-a00864"},"children":[{"type":"text","value":"Fish"}]},{"type":"element","tag":"span","props":{"class":"ct-c22dcc"},"children":[{"type":"text","value":" "}]},{"type":"element","tag":"span","props":{"class":"ct-a235f1"},"children":[{"type":"text","value":"|"}]},{"type":"element","tag":"span","props":{"class":"ct-c22dcc"},"children":[{"type":"text","value":" "}]},{"type":"element","tag":"span","props":{"class":"ct-a00864"},"children":[{"type":"text","value":"Bird"}]},{"type":"element","tag":"span","props":{"class":"ct-c22dcc"},"children":[{"type":"text","value":")"}]},{"type":"element","tag":"span","props":{"class":"ct-a235f1"},"children":[{"type":"text","value":":"}]},{"type":"element","tag":"span","props":{"class":"ct-c22dcc"},"children":[{"type":"text","value":" "}]},{"type":"element","tag":"span","props":{"class":"ct-69efe7"},"children":[{"type":"text","value":"pet"}]},{"type":"element","tag":"span","props":{"class":"ct-c22dcc"},"children":[{"type":"text","value":" "}]},{"type":"element","tag":"span","props":{"class":"ct-a235f1"},"children":[{"type":"text","value":"is"}]},{"type":"element","tag":"span","props":{"class":"ct-c22dcc"},"children":[{"type":"text","value":" "}]},{"type":"element","tag":"span","props":{"class":"ct-a00864"},"children":[{"type":"text","value":"Fish"}]},{"type":"element","tag":"span","props":{"class":"ct-c22dcc"},"children":[{"type":"text","value":" {"}]}]},{"type":"element","tag":"span","props":{"class":"line"},"children":[{"type":"element","tag":"span","props":{"class":"ct-b726ef"},"children":[{"type":"text","value":" "}]},{"type":"element","tag":"span","props":{"class":"ct-777530"},"children":[{"type":"text","value":"return"}]},{"type":"element","tag":"span","props":{"class":"ct-b726ef"},"children":[{"type":"text","value":" ("}]},{"type":"element","tag":"span","props":{"class":"ct-2fa4b5"},"children":[{"type":"text","value":"pet"}]},{"type":"element","tag":"span","props":{"class":"ct-b726ef"},"children":[{"type":"text","value":" "}]},{"type":"element","tag":"span","props":{"class":"ct-777530"},"children":[{"type":"text","value":"as"}]},{"type":"element","tag":"span","props":{"class":"ct-b726ef"},"children":[{"type":"text","value":" "}]},{"type":"element","tag":"span","props":{"class":"ct-74e15a"},"children":[{"type":"text","value":"Fish"}]},{"type":"element","tag":"span","props":{"class":"ct-b726ef"},"children":[{"type":"text","value":")."}]},{"type":"element","tag":"span","props":{"class":"ct-2fa4b5"},"children":[{"type":"text","value":"swim"}]},{"type":"element","tag":"span","props":{"class":"ct-b726ef"},"children":[{"type":"text","value":" "}]},{"type":"element","tag":"span","props":{"class":"ct-777530"},"children":[{"type":"text","value":"!=="}]},{"type":"element","tag":"span","props":{"class":"ct-b726ef"},"children":[{"type":"text","value":" "}]},{"type":"element","tag":"span","props":{"class":"ct-5a8b9e"},"children":[{"type":"text","value":"undefined"}]},{"type":"element","tag":"span","props":{"class":"ct-b726ef"},"children":[{"type":"text","value":";"}]}]},{"type":"element","tag":"span","props":{"class":"line"},"children":[{"type":"element","tag":"span","props":{"class":"ct-b726ef"},"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-fb6f11"},"children":[{"type":"text","value":"const"}]},{"type":"element","tag":"span","props":{"class":"ct-b726ef"},"children":[{"type":"text","value":" "}]},{"type":"element","tag":"span","props":{"class":"ct-d9477a"},"children":[{"type":"text","value":"pet"}]},{"type":"element","tag":"span","props":{"class":"ct-b726ef"},"children":[{"type":"text","value":" "}]},{"type":"element","tag":"span","props":{"class":"ct-777530"},"children":[{"type":"text","value":"="}]},{"type":"element","tag":"span","props":{"class":"ct-b726ef"},"children":[{"type":"text","value":" "}]},{"type":"element","tag":"span","props":{"class":"ct-36856c"},"children":[{"type":"text","value":"getSmallPet"}]},{"type":"element","tag":"span","props":{"class":"ct-b726ef"},"children":[{"type":"text","value":"();"}]}]},{"type":"element","tag":"span","props":{"class":"line"},"children":[{"type":"element","tag":"span","props":{"class":"ct-b726ef"},"children":[{"type":"text","value":" "}]}]},{"type":"element","tag":"span","props":{"class":"line"},"children":[{"type":"element","tag":"span","props":{"class":"ct-777530"},"children":[{"type":"text","value":"if"}]},{"type":"element","tag":"span","props":{"class":"ct-b726ef"},"children":[{"type":"text","value":" ("}]},{"type":"element","tag":"span","props":{"class":"ct-36856c"},"children":[{"type":"text","value":"isFish"}]},{"type":"element","tag":"span","props":{"class":"ct-b726ef"},"children":[{"type":"text","value":"("}]},{"type":"element","tag":"span","props":{"class":"ct-2fa4b5"},"children":[{"type":"text","value":"pet"}]},{"type":"element","tag":"span","props":{"class":"ct-b726ef"},"children":[{"type":"text","value":")) {"}]}]},{"type":"element","tag":"span","props":{"class":"line"},"children":[{"type":"element","tag":"span","props":{"class":"ct-b726ef"},"children":[{"type":"text","value":" "}]},{"type":"element","tag":"span","props":{"class":"ct-2fa4b5"},"children":[{"type":"text","value":"pet"}]},{"type":"element","tag":"span","props":{"class":"ct-b726ef"},"children":[{"type":"text","value":"."}]},{"type":"element","tag":"span","props":{"class":"ct-36856c"},"children":[{"type":"text","value":"swim"}]},{"type":"element","tag":"span","props":{"class":"ct-b726ef"},"children":[{"type":"text","value":"();"}]}]},{"type":"element","tag":"span","props":{"class":"line"},"children":[{"type":"element","tag":"span","props":{"class":"ct-b726ef"},"children":[{"type":"text","value":"} "}]},{"type":"element","tag":"span","props":{"class":"ct-777530"},"children":[{"type":"text","value":"else"}]},{"type":"element","tag":"span","props":{"class":"ct-b726ef"},"children":[{"type":"text","value":" {"}]}]},{"type":"element","tag":"span","props":{"class":"line"},"children":[{"type":"element","tag":"span","props":{"class":"ct-b726ef"},"children":[{"type":"text","value":" "}]},{"type":"element","tag":"span","props":{"class":"ct-2fa4b5"},"children":[{"type":"text","value":"pet"}]},{"type":"element","tag":"span","props":{"class":"ct-b726ef"},"children":[{"type":"text","value":"."}]},{"type":"element","tag":"span","props":{"class":"ct-36856c"},"children":[{"type":"text","value":"fly"}]},{"type":"element","tag":"span","props":{"class":"ct-b726ef"},"children":[{"type":"text","value":"();"}]}]},{"type":"element","tag":"span","props":{"class":"line"},"children":[{"type":"element","tag":"span","props":{"class":"ct-b726ef"},"children":[{"type":"text","value":"}"}]}]}]}]}]},{"type":"element","tag":"style","children":[{"type":"text","value":".ct-36856c{color:#D2A8FF}.ct-d9477a{color:#79C0FF}.ct-fb6f11{color:#FF7B72}.ct-5a8b9e{color:#79C0FF}.ct-74e15a{color:#FFA657}.ct-2fa4b5{color:#C9D1D9}.ct-777530{color:#FF7B72}.ct-b726ef{color:#C9D1D9}.ct-a00864{color:#FFA657}.ct-a235f1{color:#FF7B72}.ct-69efe7{color:#FFA657}.ct-117e1f{color:#D2A8FF}.ct-c22dcc{color:#C9D1D9}.ct-25eac6{color:#FF7B72}.light .ct-25eac6{color:#073642}.light .ct-c22dcc{color:#657B83}.light .ct-117e1f{color:#268BD2}.light .ct-69efe7{color:#657B83}.light .ct-a235f1{color:#859900}.light .ct-a00864{color:#268BD2}.light .ct-b726ef{color:#657B83}.light .ct-777530{color:#859900}.light .ct-2fa4b5{color:#268BD2}.light .ct-74e15a{color:#268BD2}.light .ct-5a8b9e{color:#B58900}.light .ct-fb6f11{color:#073642}.light .ct-d9477a{color:#268BD2}.light .ct-36856c{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