Bump to v4.1.0.

_equalArrays.js

@@ -0,0 +1,72 @@
+var arraySome = require('./_arraySome');
+
+/** Used to compose bitmasks for comparison styles. */
+var UNORDERED_COMPARE_FLAG = 1,
+    PARTIAL_COMPARE_FLAG = 2;
+
+/**
+ * A specialized version of `baseIsEqualDeep` for arrays with support for
+ * partial deep comparisons.
+ *
+ * @private
+ * @param {Array} array The array to compare.
+ * @param {Array} other The other array to compare.
+ * @param {Function} equalFunc The function to determine equivalents of values.
+ * @param {Function} [customizer] The function to customize comparisons.
+ * @param {number} [bitmask] The bitmask of comparison flags. See `baseIsEqual` for more details.
+ * @param {Object} [stack] Tracks traversed `array` and `other` objects.
+ * @returns {boolean} Returns `true` if the arrays are equivalent, else `false`.
+ */
+function equalArrays(array, other, equalFunc, customizer, bitmask, stack) {
+  var index = -1,
+      isPartial = bitmask & PARTIAL_COMPARE_FLAG,
+      isUnordered = bitmask & UNORDERED_COMPARE_FLAG,
+      arrLength = array.length,
+      othLength = other.length;
+
+  if (arrLength != othLength && !(isPartial && othLength > arrLength)) {
+    return false;
+  }
+  // Assume cyclic values are equal.
+  var stacked = stack.get(array);
+  if (stacked) {
+    return stacked == other;
+  }
+  var result = true;
+  stack.set(array, other);
+
+  // Ignore non-index properties.
+  while (++index < arrLength) {
+    var arrValue = array[index],
+        othValue = other[index];
+
+    if (customizer) {
+      var compared = isPartial
+        ? customizer(othValue, arrValue, index, other, array, stack)
+        : customizer(arrValue, othValue, index, array, other, stack);
+    }
+    if (compared !== undefined) {
+      if (compared) {
+        continue;
+      }
+      result = false;
+      break;
+    }
+    // Recursively compare arrays (susceptible to call stack limits).
+    if (isUnordered) {
+      if (!arraySome(other, function(othValue) {
+            return arrValue === othValue || equalFunc(arrValue, othValue, customizer, bitmask, stack);
+          })) {
+        result = false;
+        break;
+      }
+    } else if (!(arrValue === othValue || equalFunc(arrValue, othValue, customizer, bitmask, stack))) {
+      result = false;
+      break;
+    }
+  }
+  stack['delete'](array);
+  return result;
+}
+
+module.exports = equalArrays;