cesium/Source/Core/arraySlice.js

CesiumJS is a JavaScript library for creating 3D globes and 2D maps in a web browser without a plugin.

import Check from "./Check.js";
import defined from "./defined.js";
import FeatureDetection from "./FeatureDetection.js";

/**
 * Create a shallow copy of an array from begin to end.
 *
 * @param {Array} array The array to fill.
 * @param {Number} [begin=0] The index to start at.
 * @param {Number} [end=array.length] The index to end at which is not included.
 *
 * @returns {Array} The resulting array.
 * @private
 */
function arraySlice(array, begin, end) {
  //>>includeStart('debug', pragmas.debug);
  Check.defined("array", array);
  if (defined(begin)) {
    Check.typeOf.number("begin", begin);
  }
  if (defined(end)) {
    Check.typeOf.number("end", end);
  }
  //>>includeEnd('debug');

  if (typeof array.slice === "function") {
    return array.slice(begin, end);
  }

  var copy = Array.prototype.slice.call(array, begin, end);
  var typedArrayTypes = FeatureDetection.typedArrayTypes;
  var length = typedArrayTypes.length;
  for (var i = 0; i < length; ++i) {
    if (array instanceof typedArrayTypes[i]) {
      copy = new typedArrayTypes[i](copy);
      break;
    }
  }

  return copy;
}
export default arraySlice;