Added the underscore node_module.

node_modules/underscore/cjs/isEqual.js

@@ -0,0 +1,140 @@
+var underscore = require('./underscore.js');
+var _setup = require('./_setup.js');
+var _getByteLength = require('./_getByteLength.js');
+var isTypedArray = require('./isTypedArray.js');
+var isFunction = require('./isFunction.js');
+var _stringTagBug = require('./_stringTagBug.js');
+var isDataView = require('./isDataView.js');
+var keys = require('./keys.js');
+var _has = require('./_has.js');
+var _toBufferView = require('./_toBufferView.js');
+
+// We use this string twice, so give it a name for minification.
+var tagDataView = '[object DataView]';
+
+// Internal recursive comparison function for `_.isEqual`.
+function eq(a, b, aStack, bStack) {
+  // Identical objects are equal. `0 === -0`, but they aren't identical.
+  // See the [Harmony `egal` proposal](https://wiki.ecmascript.org/doku.php?id=harmony:egal).
+  if (a === b) return a !== 0 || 1 / a === 1 / b;
+  // `null` or `undefined` only equal to itself (strict comparison).
+  if (a == null || b == null) return false;
+  // `NaN`s are equivalent, but non-reflexive.
+  if (a !== a) return b !== b;
+  // Exhaust primitive checks
+  var type = typeof a;
+  if (type !== 'function' && type !== 'object' && typeof b != 'object') return false;
+  return deepEq(a, b, aStack, bStack);
+}
+
+// Internal recursive comparison function for `_.isEqual`.
+function deepEq(a, b, aStack, bStack) {
+  // Unwrap any wrapped objects.
+  if (a instanceof underscore) a = a._wrapped;
+  if (b instanceof underscore) b = b._wrapped;
+  // Compare `[[Class]]` names.
+  var className = _setup.toString.call(a);
+  if (className !== _setup.toString.call(b)) return false;
+  // Work around a bug in IE 10 - Edge 13.
+  if (_stringTagBug.hasStringTagBug && className == '[object Object]' && isDataView(a)) {
+    if (!isDataView(b)) return false;
+    className = tagDataView;
+  }
+  switch (className) {
+    // These types are compared by value.
+    case '[object RegExp]':
+      // RegExps are coerced to strings for comparison (Note: '' + /a/i === '/a/i')
+    case '[object String]':
+      // Primitives and their corresponding object wrappers are equivalent; thus, `"5"` is
+      // equivalent to `new String("5")`.
+      return '' + a === '' + b;
+    case '[object Number]':
+      // `NaN`s are equivalent, but non-reflexive.
+      // Object(NaN) is equivalent to NaN.
+      if (+a !== +a) return +b !== +b;
+      // An `egal` comparison is performed for other numeric values.
+      return +a === 0 ? 1 / +a === 1 / b : +a === +b;
+    case '[object Date]':
+    case '[object Boolean]':
+      // Coerce dates and booleans to numeric primitive values. Dates are compared by their
+      // millisecond representations. Note that invalid dates with millisecond representations
+      // of `NaN` are not equivalent.
+      return +a === +b;
+    case '[object Symbol]':
+      return _setup.SymbolProto.valueOf.call(a) === _setup.SymbolProto.valueOf.call(b);
+    case '[object ArrayBuffer]':
+    case tagDataView:
+      // Coerce to typed array so we can fall through.
+      return deepEq(_toBufferView(a), _toBufferView(b), aStack, bStack);
+  }
+
+  var areArrays = className === '[object Array]';
+  if (!areArrays && isTypedArray(a)) {
+      var byteLength = _getByteLength(a);
+      if (byteLength !== _getByteLength(b)) return false;
+      if (a.buffer === b.buffer && a.byteOffset === b.byteOffset) return true;
+      areArrays = true;
+  }
+  if (!areArrays) {
+    if (typeof a != 'object' || typeof b != 'object') return false;
+
+    // Objects with different constructors are not equivalent, but `Object`s or `Array`s
+    // from different frames are.
+    var aCtor = a.constructor, bCtor = b.constructor;
+    if (aCtor !== bCtor && !(isFunction(aCtor) && aCtor instanceof aCtor &&
+                             isFunction(bCtor) && bCtor instanceof bCtor)
+                        && ('constructor' in a && 'constructor' in b)) {
+      return false;
+    }
+  }
+  // Assume equality for cyclic structures. The algorithm for detecting cyclic
+  // structures is adapted from ES 5.1 section 15.12.3, abstract operation `JO`.
+
+  // Initializing stack of traversed objects.
+  // It's done here since we only need them for objects and arrays comparison.
+  aStack = aStack || [];
+  bStack = bStack || [];
+  var length = aStack.length;
+  while (length--) {
+    // Linear search. Performance is inversely proportional to the number of
+    // unique nested structures.
+    if (aStack[length] === a) return bStack[length] === b;
+  }
+
+  // Add the first object to the stack of traversed objects.
+  aStack.push(a);
+  bStack.push(b);
+
+  // Recursively compare objects and arrays.
+  if (areArrays) {
+    // Compare array lengths to determine if a deep comparison is necessary.
+    length = a.length;
+    if (length !== b.length) return false;
+    // Deep compare the contents, ignoring non-numeric properties.
+    while (length--) {
+      if (!eq(a[length], b[length], aStack, bStack)) return false;
+    }
+  } else {
+    // Deep compare objects.
+    var _keys = keys(a), key;
+    length = _keys.length;
+    // Ensure that both objects contain the same number of properties before comparing deep equality.
+    if (keys(b).length !== length) return false;
+    while (length--) {
+      // Deep compare each member
+      key = _keys[length];
+      if (!(_has(b, key) && eq(a[key], b[key], aStack, bStack))) return false;
+    }
+  }
+  // Remove the first object from the stack of traversed objects.
+  aStack.pop();
+  bStack.pop();
+  return true;
+}
+
+// Perform a deep comparison to check if two objects are equal.
+function isEqual(a, b) {
+  return eq(a, b);
+}
+
+module.exports = isEqual;