Function groupBy

  • groupBy<T, G>(array, keyCallback): [G, T[]][]

  • Groups an array based on callback return value

    Type Parameters

    • T
    • G

    Parameters

    • array: T[]
    • keyCallback: ((value: T) => G)
        • (value): G

        • Parameters

          • value: T

          Returns G

    Returns [G, T[]][]

    Example

    groupBy([6.1, 4.2, 6.3], Math.floor)
    // [ [4, [4.2]], [6, [6.1, 6.3]] ]

    groupBy(['one', 'two', 'three'], v => [v.length, v.includes('a')])
    // [ [[5, false], ['three']], [[3, false], ['one', 'two']] ]
  • groupBy<T, G>(array, keyCallback): ReadonlyArray<[G, T[]]>

  • Type Parameters

    • T
    • G

    Parameters

    • array: readonly T[]
    • keyCallback: ((value: T) => G)
        • (value): G

        • Parameters

          • value: T

          Returns G

    Returns ReadonlyArray<[G, T[]]>

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