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;