JavaScript for impatient programmers by Dr. Axel Rauschmayer

Author:Dr. Axel Rauschmayer
Language: eng
Format: epub
Published: 2019-05-14T16:00:00+00:00

So far, we have always used objects as records. Property keys were fixed tokens that had to be valid identifiers and internally became strings:

const obj = { mustBeAnIdentifier: 123, }; // Get property assert.equal(obj.mustBeAnIdentifier, 123); // Set property obj.mustBeAnIdentifier = 'abc'; assert.equal(obj.mustBeAnIdentifier, 'abc');

As a next step, we’ll go beyond this limitation for property keys: In this section, we’ll use arbitrary fixed strings as keys. In the next subsection, we’ll dynamically compute keys.

Two techniques allow us to use arbitrary strings as property keys.

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