partialRight

Creates a new function with arguments pre-filled on the right.

Syntax

partialRight<Args extends any[], R, P extends Partial<Args>>(
  callback: (...args: Args) => R | Promise<R>,
  ...partial: P
): (...args: DropLast<Args, P>) => R | Promise<R>

Parameters

Name	Type	Description
callback	(...args: Args) => R | Promise<R>	Original function to be partially applied.
...partial	P	Arguments to be pre-filled on the right.

Returns

Type	Description
(...args: DropLast<Args, P>) => R | Promise<R>	New function with partial arguments applied to the right.

Example

const concat = (a: string, b: string, c: string) => a + b + c;
const partialConcat = partialRight(concat, "C");
partialConcat("A", "B"); // "ABC"

Notes

• Throws a TypeError if the callback is not a function.
• Useful for creating specialized functions from generic ones.

References

• MDN: Partial application