Add ol.array.safeExtend

src/ol/array.js

@@ -37,6 +37,25 @@ ol.array.binaryFindNearest = function(arr, target) {
 };
 
 
+/**
+ * Safe version of goog.array.extend that does not risk to overflow the stack
+ * even if `array2` contains a large number of elements.
+ *
+ * @param {Array.<T>} array1 Array 1.
+ * @param {Array.<T>} array2 Array 2.
+ * @template T
+ */
+ol.array.safeExtend = function(array1, array2) {
+  // goog.array.extend uses Array.prototype.push.apply, which can overflow the
+  // stack if array2 contains too many elements.  Repeatedly calling push
+  // performs as well on modern browsers.
+  var i, ii;
+  for (i = 0, ii = array2.length; i < ii; ++i) {
+    array1.push(array2[i]);
+  }
+};
+
+
 /**
  * @param {Array.<number>} arr Array.
  * @param {number} target Target.