Web Reference: Setting dynamic property keys allows you to create object properties with names that are determined at runtime. JavaScript provides three main approaches to accomplish this. The simplest way is using bracket notation to assign a value to a dynamically named property: That sounds really weird, but it just means that given an array instance, the properties with names like "0", "5", "207", and so on, are all treated specially in that their existence determines the value of length. And, on top of that, the value of length can be set to remove such properties. Feb 17, 2023 · In this article, I've shown you how the Computed Property Names support in JavaScript works to add dynamic keys when declaring objects. You can think of any expression that returns a value.
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