Method takeFromStart

packages/db/src/indexes/basic-index.ts:425–439

* Returns the first n items in sorted order (from the start)

(n: number, filterFn?: (key: TKey) => boolean)

   * Returns the first n items in sorted order (from the start)
   */
  takeFromStart(n: number, filterFn?: (key: TKey) => boolean): Array<TKey> {
    const result: Array<TKey> = []
    for (let i = 0; i < this.sortedValues.length && result.length < n; i++) {
      const keys = this.valueMap.get(this.sortedValues[i])
      if (keys) {
        for (const key of keys) {
          if (result.length >= n) break
          if (!filterFn || filterFn(key)) {
            result.push(key)
          }
        }
      }
    }
    return result
  }

  /**
   * Returns the first n items in reverse sorted order (from the end)