Variable reduceConst

Type Declaration

• • <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 left to right.

    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 words = ['Ada', 'Lovelace'] as const;
    
    const totalLength = Arr.foldl(words, (acc, word) => acc + word.length, 0);
    
    const concat = Arr.foldl<string | number, string>(
      (acc, value) => `${acc}-${value}`,
      'items',
    )(words);
    
    assert.isTrue(totalLength === 11);
    
    assert.isTrue(concat === 'items-Ada-Lovelace');
    Copy

  • <E, P>(
        callbackfn: (
            previousValue: P,
            currentValue: E,
            currentIndex: Uint32,
        ) => P,
        initialValue: P,
    ): (array: readonly E[]) => P

  • Reduces an array to a single value from left to right.

    Type Parameters

    • E
    • P

    Parameters

    • callbackfn: (previousValue: P, currentValue: E, currentIndex: Uint32) => P
    • initialValue: P

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

    Example

    const words = ['Ada', 'Lovelace'] as const;
    
    const totalLength = Arr.foldl(words, (acc, word) => acc + word.length, 0);
    
    const concat = Arr.foldl<string | number, string>(
      (acc, value) => `${acc}-${value}`,
      'items',
    )(words);
    
    assert.isTrue(totalLength === 11);
    
    assert.isTrue(concat === 'items-Ada-Lovelace');
    Copy