[Home](./index.md) > [rc-js-util](./rc-js-util.md) > [\_Fp](./rc-js-util._fp.md) ## \_Fp class Utilities for functional programming. **Signature:** ```typescript export declare class _Fp ``` ## Properties

Property	Modifiers	Type	Description
[debounce](./rc-js-util._fp.debounce.md)	`static` `readonly`	typeof fpDebounce	Creates a function that will proxy calls to `functionToProxy` when `wait` time has passed since the last call, using the most recent arguments. Where `immediate` is true, the function immediately proxies the call and will not proxy again until `wait` time passes since the last call.
[identity](./rc-js-util._fp.identity.md)	`static` `readonly`	typeof fpIdentity	Returns the argument.
[maybeNewValue](./rc-js-util._fp.maybenewvalue.md)	`static` `readonly`	typeof fpMaybeNewValue	Returns the newValue if defined, else the old value.
[noOp](./rc-js-util._fp.noop.md)	`static` `readonly`	typeof fpNoOp	Does nothing (intentionally...).
[normalizeToNull](./rc-js-util._fp.normalizetonull.md)	`static` `readonly`	typeof fpNormalizeToNull	Normalizes `undefined` input to `null`.
[normalizeToUndefined](./rc-js-util._fp.normalizetoundefined.md)	`static` `readonly`	typeof fpNormalizeToUndefined	Normalizes `null` input to `undefined`.
[once](./rc-js-util._fp.once.md)	`static` `readonly`	typeof fpOnce	Creates a function that can be called many times but will run at most once.
[runWithin](./rc-js-util._fp.runwithin.md)	`static` `readonly`	typeof fpRunWithin	Runs the `callback` within the `wrapperFunctions`. This is useful for "positional" attributes, like debug labels, lifecycle block scopes etc.
[valueOrNull](./rc-js-util._fp.valueornull.md)	`static` `readonly`	typeof fpValueOrNull	Returns the value if the predicate is true, else null.