Rediscovering JavaScript

Defining Computed Members

Sometimes we like to give dynamic names to members of a class—that is, to fields, properties, and methods. The approach to achieve this is also useful as a workaround to provide arbitrary names for members, bypassing the language’s restriction on making the members with only alphanumeric characters.

Recall using special method names like Symbol.search and Symbol.iterator in Chapter 4, ​Iterators and Symbols​. Writing a method named Symbol.iterator() {} will result in an unexpected token error. We had to place it within [], like so: [Symbol.iterator]() {}.

To create a computed property, we place a variable containing the name of the property as the value in []. Alternatively, we can place a string or a template literal ...