Function foldr

foldr<const Ar extends readonly unknown[], P>(
    array: Ar,
    callbackfn: (
        previousValue: P,
        currentValue: Ar[number],
        currentIndex: ArrayIndex<Ar>,
    ) => P,
    initialValue: P,
): P
Reduces an array to a single value from right to left.
Type Parameters
- const Ar extends readonly unknown[]
- P
Parameters
- array: Ar
- callbackfn: (previousValue: P, currentValue: Ar[number], currentIndex: ArrayIndex<Ar>) => P
- initialValue: P
Returns P
Example
```
const numbers = [1, 2, 3];

const subtractRight = Arr.foldr(numbers, (acc, value) => acc - value, 0);
const joinFromRight = Arr.foldr<number, string>(
  (acc, value) => `${acc}${value}`,
  '',
)(numbers);

assert(subtractRight === -6);
assert(joinFromRight === '321');
```
- Defined in src/array/impl/array-utils-reducing-value.mts:394
foldr<E, P>(
    callbackfn: (
        previousValue: P,
        currentValue: E,
        currentIndex: Uint32,
    ) => P,
    initialValue: P,
): (array: readonly E[]) => P
Reduces an array to a single value from right to left.
Type Parameters
- E
- P
Parameters
- callbackfn: (previousValue: P, currentValue: E, currentIndex: Uint32) => P
- initialValue: P
Returns (array: readonly E[]) => P
Example
```
const numbers = [1, 2, 3];

const subtractRight = Arr.foldr(numbers, (acc, value) => acc - value, 0);
const joinFromRight = Arr.foldr<number, string>(
  (acc, value) => `${acc}${value}`,
  '',
)(numbers);

assert(subtractRight === -6);
assert(joinFromRight === '321');
```
- Defined in src/array/impl/array-utils-reducing-value.mts:404

Function foldr

Type Parameters

Parameters

Returns P

Example

Type Parameters

Parameters

Returns (array: readonly E[]) => P

Example

Settings