cesium/Source/Core/arrayFill.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 defaultValue from "./defaultValue.js";
import defined from "./defined.js";

/**
 * Fill an array or a portion of an array with a given value.
 *
 * @param {Array} array The array to fill.
 * @param {*} value The value to fill the array with.
 * @param {Number} [start=0] The index to start filling at.
 * @param {Number} [end=array.length] The index to end stop at.
 *
 * @returns {Array} The resulting array.
 * @private
 */
function arrayFill(array, value, start, end) {
  //>>includeStart('debug', pragmas.debug);
  Check.defined("array", array);
  Check.defined("value", value);
  if (defined(start)) {
    Check.typeOf.number("start", start);
  }
  if (defined(end)) {
    Check.typeOf.number("end", end);
  }
  //>>includeEnd('debug');

  if (typeof array.fill === "function") {
    return array.fill(value, start, end);
  }

  var length = array.length >>> 0;
  var relativeStart = defaultValue(start, 0);
  // If negative, find wrap around position
  var k =
    relativeStart < 0
      ? Math.max(length + relativeStart, 0)
      : Math.min(relativeStart, length);
  var relativeEnd = defaultValue(end, length);
  // If negative, find wrap around position
  var last =
    relativeEnd < 0
      ? Math.max(length + relativeEnd, 0)
      : Math.min(relativeEnd, length);

  // Fill array accordingly
  while (k < last) {
    array[k] = value;
    k++;
  }
  return array;
}
export default arrayFill;