Function isEmpty

  • isEmpty(map: ReadonlyMap<unknown, unknown>): map is ReadonlyMap<never, never>

  • Check if a readonly Map is empty.

    Time complexity: O(1)

    Space complexity: O(1)

    Parameters

    • map: ReadonlyMap<unknown, unknown>

      The Map to check

    Returns map is ReadonlyMap<never, never>

    true if map is empty, false otherwise

    Map

    Example

    isEmpty(new Map([1, 2, 3])); // false

    Example

    isEmpty(new Map()); // true
  • isEmpty(map: Map<unknown, unknown>): map is Map<never, never>

  • Check if a Map is empty.

    Time complexity: O(1)

    Space complexity: O(1)

    Parameters

    • map: Map<unknown, unknown>

      The Map to check

    Returns map is Map<never, never>

    true if map is empty, false otherwise

    Map

    Example

    isEmpty(new Map([['a', 1], ['b', 2], ['c', 3]])); // false

    Example

    isEmpty(new Map()); // true
  • isEmpty(set: ReadonlySet<unknown>): set is ReadonlySet<never>

  • Check if a readonly Set is empty.

    Time complexity: O(1)

    Space complexity: O(1)

    Parameters

    • set: ReadonlySet<unknown>

      The Set to check

    Returns set is ReadonlySet<never>

    true if set is empty, false otherwise

    Set

    Example

    isEmpty(new Set([1, 2, 3])); // false

    Example

    isEmpty(new Set()); // true
  • isEmpty(set: Set<unknown>): set is Set<never>

  • Check if a Set is empty.

    Time complexity: O(1)

    Space complexity: O(1)

    Parameters

    • set: Set<unknown>

      The Set to check

    Returns set is Set<never>

    true if set is empty, false otherwise

    Set

    Example

    isEmpty(new Set([1, 2, 3])); // false

    Example

    isEmpty(new Set()); // true
  • isEmpty(string: string): string is ""

  • Check if a string is empty.

    Time complexity: O(1)

    Space complexity: O(1)

    Parameters

    • string: string

      The string to check

    Returns string is ""

    true if string is empty, false otherwise

    String

    Example

    isEmpty('hello'); // false

    Example

    isEmpty(''); // true
  • isEmpty(array: readonly unknown[]): array is readonly []

  • Check if a readonly array is empty.

    Time complexity: O(1)

    Space complexity: O(1)

    Parameters

    • array: readonly unknown[]

      The array to check

    Returns array is readonly []

    true if array is empty, false otherwise

    Array

    Example

    isEmpty([1, 2, 3]); // false

    Example

    isEmpty([]); // true
  • isEmpty(array: unknown[]): array is []

  • Check if an array is empty.

    Time complexity: O(1)

    Space complexity: O(1)

    Parameters

    • array: unknown[]

      The array to check

    Returns array is []

    true if array is empty, false otherwise

    Array

    Example

    isEmpty([1, 2, 3]); // false

    Example

    isEmpty([]); // true
  • isEmpty(iterable: Iterable<unknown>): iterable is Iterable<never>

  • Check if an iterable is empty.

    Time complexity: O(1)

    Space complexity: O(1)

    Parameters

    • iterable: Iterable<unknown>

      The iterable to check

    Returns iterable is Iterable<never>

    true if iterable is empty, false otherwise

    Iterable

    Example

    isEmpty([1, 2, 3]); // false

    Example

    isEmpty([]); // true

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