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Filename : index.js

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/*!
 * array-slice <https://github.com/jonschlinkert/array-slice>
 *
 * Copyright (c) 2014-2017, Jon Schlinkert.
 * Released under the MIT License.
 */

'use strict';

module.exports = function slice(arr, start, end) {
  var len = arr.length;
  var range = [];

  start = idx(len, start);
  end = idx(len, end, len);

  while (start < end) {
    range.push(arr[start++]);
  }
  return range;
};

function idx(len, pos, end) {
  if (pos == null) {
    pos = end || 0;
  } else if (pos < 0) {
    pos = Math.max(len + pos, 0);
  } else {
    pos = Math.min(pos, len);
  }

  return pos;
}