Function lookupTable

packages/effect/src/Cron.ts:202–233

(
  values: ReadonlyArray<number>,
  size: number,
  dir: "next" | "prev"
)

}

const lookupTable = (
  values: ReadonlyArray<number>,
  size: number,
  dir: "next" | "prev"
): Array<number | undefined> => {
  const result = new Array(size).fill(undefined)
  if (values.length === 0) {
    return result
  }

  let current: number | undefined = undefined

  if (dir === "next") {
    let index = values.length - 1
    for (let i = size - 1; i >= 0; i--) {
      while (index >= 0 && values[index] >= i) {
        current = values[index--]
      }
      result[i] = current
    }
  } else {
    let index = 0
    for (let i = 0; i < size; i++) {
      while (index < values.length && values[index] <= i) {
        current = values[index++]
      }
      result[i] = current
    }
  }

  return result
}

/**
 * @since 2.0.0