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Added unknown type in typescript.html.markdown

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Vishakha Tak 2024-10-29 18:08:55 +05:30 committed by GitHub
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commit 6c2f1c7132
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@ -37,6 +37,11 @@ let notSure: any = 4;
notSure = "maybe a string instead"; notSure = "maybe a string instead";
notSure = false; // okay, definitely a boolean notSure = false; // okay, definitely a boolean
// When we are not sure about the type, and don't want to use "any", we can use "unknown" type
let unknownVariable: unknown = 'Abc'; // we don't fully know yet the type
unknownVariable = 1234; // possible
const someVariable: string = unknownVariable; // Invalid; we can't assign unknownVariable to any other type (without an explicit assertion), unlike any
// Use const keyword for constants // Use const keyword for constants
const numLivesForCat = 9; const numLivesForCat = 9;
numLivesForCat = 1; // Error numLivesForCat = 1; // Error