Method slice

lib/internal/blob.js:244–282

* @param {number} [start] * @param {number} [end] * @param {string} [contentType] * @returns {Blob}

(start = 0, end = this[kLength], contentType = '')

   * @returns {Blob}
   */
  slice(start = 0, end = this[kLength], contentType = '') {
    if (!isBlob(this))
      throw new ERR_INVALID_THIS('Blob');

    start = converters['long long'](
      start,
      { __proto__: null, context: 'start' },
    );
    end = converters['long long'](
      end,
      { __proto__: null, context: 'end' },
    );

    if (start < 0) {
      start = MathMax(this[kLength] + start, 0);
    } else {
      start = MathMin(start, this[kLength]);
    }

    if (end < 0) {
      end = MathMax(this[kLength] + end, 0);
    } else {
      end = MathMin(end, this[kLength]);
    }

    contentType = `${contentType}`;
    if (RegExpPrototypeExec(disallowedTypeCharacters, contentType) !== null) {
      contentType = '';
    } else {
      contentType = StringPrototypeToLowerCase(contentType);
    }

    const span = MathMax(end - start, 0);

    return createBlob(
      this[kHandle].slice(start, start + span),
      span,
      contentType);
  }

  /**
   * @returns {Promise<ArrayBuffer>}