All files / iterable/src every.ts

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
3x
3x
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
13x
3x
13x
13x
 
 
import { not, Predicate } from "@benneq/predicate";
import { some } from "./some";
 
/**
 * Checks if all elements of an {@link Iterable} match a {@link Predicate}.
 *
 * @example
 * ```ts
 * const allValuesEven = every(isEven);
 * const result = allValuesEven([2,4,6]);
 * console.log(result); // true
 * ```
 *
 * @see {@link filter} and {@link some} for similar operations.
 *
 * @typeParam T - the {@link Iterable} value type
 * @param predicate - the {@link Predicate} to match
 * @returns `true` if the {@link Predicate} returns `true` for all elements
 */
export const every =
  <T>(predicate: Predicate<[T]>) =>
  (iterable: Iterable<T>): boolean => {
    return !some<T>(not(predicate))(iterable);
  };