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OK, but what are all these classes? That's what I came here to find out, after all.

The world of string classes is divided into two parallel hierarchies. One for one-byte data-structures (e.g., nsACString) and one for two-byte data-structures (e.g., nsAString). The top of the hierarchy is nsAString. discuss the relationship of nsAString to "What is a string?".

There are two other important abstract classes just below nsAString:

These abstract classes, and nsAString most of all, primarily appear in APIs. In your APIs, you will usually want to use nsAString unless you have a convincing argument for something more specific.

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