Bump to v3.9.0.

internal/equalArrays.js

@@ -1,3 +1,5 @@
+import arraySome from './arraySome';
+
 /**
  * A specialized version of `baseIsEqualDeep` for arrays with support for
  * partial deep comparisons.
@@ -15,40 +17,35 @@
 function equalArrays(array, other, equalFunc, customizer, isLoose, stackA, stackB) {
   var index = -1,
       arrLength = array.length,
-      othLength = other.length,
-      result = true;
+      othLength = other.length;
 
   if (arrLength != othLength && !(isLoose && othLength > arrLength)) {
     return false;
   }
-  // Deep compare the contents, ignoring non-numeric properties.
-  while (result && ++index < arrLength) {
+  // Ignore non-index properties.
+  while (++index < arrLength) {
     var arrValue = array[index],
-        othValue = other[index];
+        othValue = other[index],
+        result = customizer ? customizer(isLoose ? othValue : arrValue, isLoose ? arrValue : othValue, index) : undefined;
 
-    result = undefined;
-    if (customizer) {
-      result = isLoose
-        ? customizer(othValue, arrValue, index)
-        : customizer(arrValue, othValue, index);
-    }
-    if (result === undefined) {
-      // Recursively compare arrays (susceptible to call stack limits).
-      if (isLoose) {
-        var othIndex = othLength;
-        while (othIndex--) {
-          othValue = other[othIndex];
-          result = (arrValue && arrValue === othValue) || equalFunc(arrValue, othValue, customizer, isLoose, stackA, stackB);
-          if (result) {
-            break;
-          }
-        }
-      } else {
-        result = (arrValue && arrValue === othValue) || equalFunc(arrValue, othValue, customizer, isLoose, stackA, stackB);
+    if (result !== undefined) {
+      if (result) {
+        continue;
       }
+      return false;
+    }
+    // Recursively compare arrays (susceptible to call stack limits).
+    if (isLoose) {
+      if (!arraySome(other, function(othValue) {
+            return arrValue === othValue || equalFunc(arrValue, othValue, customizer, isLoose, stackA, stackB);
+          })) {
+        return false;
+      }
+    } else if (!(arrValue === othValue || equalFunc(arrValue, othValue, customizer, isLoose, stackA, stackB))) {
+      return false;
     }
   }
-  return !!result;
+  return true;
 }
 
 export default equalArrays;