Rewriting Project

1 files changed, 32 insertions, 0 deletions

diff --git a/node_modules/core-js/internals/flatten-into-array.js b/node_modules/core-js/internals/flatten-into-array.js
new file mode 100644
index 0000000..df29916
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+++ b/node_modules/core-js/internals/flatten-into-array.js
@@ -0,0 +1,32 @@
+'use strict';
+var isArray = require('../internals/is-array');
+var toLength = require('../internals/to-length');
+var bind = require('../internals/function-bind-context');
+
+// `FlattenIntoArray` abstract operation
+// https://tc39.github.io/proposal-flatMap/#sec-FlattenIntoArray
+var flattenIntoArray = function (target, original, source, sourceLen, start, depth, mapper, thisArg) {
+  var targetIndex = start;
+  var sourceIndex = 0;
+  var mapFn = mapper ? bind(mapper, thisArg, 3) : false;
+  var element;
+
+  while (sourceIndex < sourceLen) {
+    if (sourceIndex in source) {
+      element = mapFn ? mapFn(source[sourceIndex], sourceIndex, original) : source[sourceIndex];
+
+      if (depth > 0 && isArray(element)) {
+        targetIndex = flattenIntoArray(target, original, element, toLength(element.length), targetIndex, depth - 1) - 1;
+      } else {
+        if (targetIndex >= 0x1FFFFFFFFFFFFF) throw TypeError('Exceed the acceptable array length');
+        target[targetIndex] = element;
+      }
+
+      targetIndex++;
+    }
+    sourceIndex++;
+  }
+  return targetIndex;
+};
+
+module.exports = flattenIntoArray;