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[key: string]: any; in your class/interface definition will do the trick. In today's video, we'll take a look at the defineProperty() function in

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How to dynamically add properties in a JavaScript object array

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This tutorial explains -

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#02 Object Properties in JavaScript | for-in Loop | Add, Delete Object Props | Nested Object

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AccessProperties #

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How to dynamically add properties to TypeScript objects

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[key: string]: any; in your class/interface definition will do the trick.

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Updating an object array based on dynamic index

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Customer question: How do I update an item in an

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Last Updated: May 24, 2026

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