Function not

  • not<T>(fn): ((...parameters: Parameters<T>) => boolean)
  • Category

    Create a new function that calls the provided fn and negates the result.

    Time complexity: O(1)

    Space complexity: O(1)

    Type Parameters

    • T extends ((...parameters: any[]) => boolean)

    Parameters

    • fn: T

      Function to negate the return value of

    Returns ((...parameters: Parameters<T>) => boolean)

    The inverted return value of fn

    Higher order

      • (...parameters): boolean

      • Parameters

        • Rest...parameters: Parameters<T>

        Returns boolean

    Example

    import { nullish } from '@jonahsnider/util';

    const array = [0, null, '', undefined, false];

    array.filter(not(nullish)); // [0, '', false]

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