[Home](./index.md) > [rc-js-util](./rc-js-util.md) > [\_String](./rc-js-util._string.md) ## \_String class Utilities that apply to `string`. **Signature:** ```typescript export declare class _String ``` ## Properties

Property	Modifiers	Type	Description
[concat2](./rc-js-util._string.concat2.md)	`static` `readonly`	typeof stringConcat2	Like concat but for only 2 parameters (yes it's dumb, but it can be a lot faster for lots of small joins).
[normalizeEmptyToUndefined](./rc-js-util._string.normalizeemptytoundefined.md)	`static` `readonly`	typeof stringNormalizeEmptyToUndefined	Replaces length 0 strings with `undefined`.
[normalizeNullUndefinedToEmpty](./rc-js-util._string.normalizenullundefinedtoempty.md)	`static` `readonly`	typeof stringNormalizeNullUndefinedToEmpty	Replaces `null` / `undefined` with an empty `string`.