Function iterate

src/function/matrix/map.js:159–190

(arrays, depth = 0)

    }

    function iterate (arrays, depth = 0) {
      // each array can have different sizes
      const currentDimensionSize = finalSize[depth]
      const result = Array(currentDimensionSize)
      if (depth < maxDepth) {
        for (let i = 0; i < currentDimensionSize; i++) {
          if (index) index[depth] = i
          // if there is an offset greater than the current dimension
          // pass the array, if the size of the array is 1 pass the first
          // element of the array
          result[i] = iterate(
            arrays.map((array, arrayIndex) =>
              offsets[arrayIndex] > depth
                ? array
                : array.length === 1
                  ? array[0]
                  : array[i]
            ),
            depth + 1
          )
        }
      } else {
        for (let i = 0; i < currentDimensionSize; i++) {
          if (index) index[depth] = i
          result[i] = callback(
            arrays.map((a) => (a.length === 1 ? a[0] : a[i])),
            index ? index.slice() : undefined
          )
        }
      }
      return result
    }
  }

  /**