diff --git a/README.md b/README.md
index 569ab2a..237d2a4 100644
--- a/README.md
+++ b/README.md
@@ -461,6 +461,27 @@ Collections: (Array+, List, Deque, Set, Map, MultiMap, SortedSet, SortedMap,
 LruSet, LruMap, LfuSet, LfuMap, SortedArray, SortedArraySet, SortedArrayMap,
 FastSet, FastMap, Dict, Heap)
 
+### deleteAll(value, opt_equals)
+
+Deletes every value equivalent to the given value from the collection.
+For sets, this is equivalent to delete, but for lists, arrays, and sorted
+arrays, may delete more than one value.
+For lists and arrays, this involves a linear search, from the beginning,
+splicing out each node as it is traversed.
+For sorted arrays, there is a mode for the provided equals and the intrinsic
+equals.
+The provided equals falls back to the linear search provided by the underlying
+array.
+However, if deleteAll uses its intrinsic order and equivalence, it can guarantee
+that all intrinsic values are within a range from the first to the last
+equivalent value, so it can splice all equivalent values at once, using a binary
+search to find the first equivalent value, and a linear search to find the last..
+The method is not implemented on Deque or Heap since random manipulation of
+internal content is out of scope for these collections.
+
+Collections: (Array+, List, Set, SortedSet, LruSet, LfuSet, SortedArray,
+SortedArraySet)
+
 ### indexOf(value)
 
 Returns the position in the collection of a value, or `-1` if it is
diff --git a/checklist.csv b/checklist.csv
index cb5eb7c..d2a1f7f 100644
--- a/checklist.csv
+++ b/checklist.csv
@@ -16,6 +16,7 @@ Order,Method,Interface,Set,SortedSet,LruSet,LfuSet,SortedArraySet,FastSet,ArrayS
 0d2a1b,"delete(value, equals)",order,(alt),(alt),(alt),(alt),(alt),(alt),(alt),(alt),(alt),(alt),(alt),(alt),(alt),(alt),(alt),List,(na),(alt),(alt),(na),Array,(alt),,,,
 0d2a2,delete(key or index),map,(alt),(alt),(alt),(alt),(alt),(alt),(alt),GenericMap,GenericMap,GenericMap,GenericMap,GenericMap,GenericMap,Dict,WeakMap,(alt),(na),(alt),(alt),(na),(alt),(todo maybe for the property change),,,GenericMap,
 0d2b1,"deleteEach(keys or values, optional equals)",collection,GenericCollection,GenericCollection,GenericCollection,GenericCollection,GenericCollection,GenericCollection,(alt),GenericCollection,GenericCollection,GenericCollection,GenericCollection,GenericCollection,GenericCollection,GenericCollection,(todo maybe),GenericCollection,(na),GenericCollection,GenericCollection,(na),GenericCollection,(todo maybe),GenericCollection,,,
+0d2c,"deleteAll(value, equals)",(na),GenericSet,GenericSet,GenericSet,GenericSet,GenericSet,GenericSet,GenericSet,(na),(na),(na),(na),(na),(na),(na),(na),List,(na),(na),SortedArray,(na),Array,(na),,GenericSet,,
 1a1,"indexOf(value, index)",array,(na),SortedSet,(na),(na),SortedArray O(log length),(na),(todo),(na),(na),(na),(na),(na),(na),(na),(na),(todo),Deque,(na),SortedArray O(log length),(todo),(spec),(na),,,,
 1a2,"lastIndexOf(value, index)",order,(na),(na because uniqueness guarantees equivalence to indexOf),(na),(na),SortedArray O(log length),(na),(todo),(na),(na),(na),(na),(na),(na),(na),(na),(todo),Deque,(na),SortedArray O(log length),(todo),(spec),(na),,,,
 1b1,"find(callback, thisp, index)",order,(todo),(todo),(na),(na),(todo),(na),(todo),(na),(na),(na),(na),(na),(na),(na),(na),(todo),(todo),(na),(todo),(todo),ES6,(na),,,,
diff --git a/generic-set.js b/generic-set.js
index f2df9fa..64bb179 100644
--- a/generic-set.js
+++ b/generic-set.js
@@ -30,6 +30,13 @@ GenericSet.prototype.symmetricDifference = function (that) {
     return union.difference(intersection);
 };
 
+GenericSet.prototype.deleteAll = function (value) {
+    // deleteAll is equivalent to delete for sets since they guarantee that
+    // only one value exists for an equivalence class, but deleteAll returns
+    // the count of deleted values instead of whether a value was deleted.
+    return +this["delete"](value);
+};
+
 GenericSet.prototype.equals = function (that, equals) {
     var self = this;
     return (
diff --git a/list.js b/list.js
index 5dda0d5..c49ffb7 100644
--- a/list.js
+++ b/list.js
@@ -37,7 +37,7 @@ List.prototype.find = function (value, equals, index) {
     var head = this.head;
     var at = this.scan(index, head.next);
     while (at !== head) {
-        if (equals(at.value, value)) {
+        if (equals(value, at.value)) {
             return at;
         }
         at = at.next;
@@ -49,7 +49,7 @@ List.prototype.findLast = function (value, equals, index) {
     var head = this.head;
     var at = this.scan(index, head.prev);
     while (at !== head) {
-        if (equals(at.value, value)) {
+        if (equals(value, at.value)) {
             return at;
         }
         at = at.prev;
@@ -88,6 +88,22 @@ List.prototype['delete'] = function (value, equals) {
     return false;
 };
 
+List.prototype.deleteAll = function (value, equals) {
+    equals = equals || this.contentEquals;
+    var head = this.head;
+    var at = head.next;
+    var count = 0;
+    while (at !== head) {
+        if (equals(value, at.value)) {
+            at["delete"]();
+            count++;
+        }
+        at = at.next;
+    }
+    this.length -= count;
+    return count;
+};
+
 List.prototype.clear = function () {
     var plus, minus;
     if (this.dispatchesRangeChanges) {
diff --git a/shim-array.js b/shim-array.js
index 1e91434..4237dee 100644
--- a/shim-array.js
+++ b/shim-array.js
@@ -118,6 +118,20 @@ define("delete", function (value, equals) {
     return false;
 });
 
+define("deleteAll", function (value, equals) {
+    equals = equals || this.contentEquals || Object.equals;
+    var count = 0;
+    for (var index = 0; index < this.length;) {
+        if (equals(value, this[index])) {
+            this.swap(index, 1);
+            count++;
+        } else {
+            index++;
+        }
+    }
+    return count;
+});
+
 define("find", function (value, equals) {
     equals = equals || this.contentEquals || Object.equals;
     for (var index = 0; index < this.length; index++) {
diff --git a/sorted-array.js b/sorted-array.js
index 461bab1..6f7f0fb 100644
--- a/sorted-array.js
+++ b/sorted-array.js
@@ -158,6 +158,34 @@ SortedArray.prototype["delete"] = function (value, equals) {
     }
 };
 
+SortedArray.prototype.deleteAll = function (value, equals) {
+    if (equals) {
+        var count = this.array.deleteAll(value, equals);
+        this.length -= count;
+        return count;
+    } else {
+        var start = searchFirst(this.array, value, this.contentCompare, this.contentEquals);
+        if (start !== -1) {
+            var end = start;
+            while (this.contentEquals(value, this.array[end])) {
+                end++;
+            }
+            var minus = this.slice(start, end);
+            if (this.dispatchesRangeChanges) {
+                this.dispatchBeforeRangeChange([], minus, start);
+            }
+            this.array.splice(start, minus.length);
+            this.length -= minus.length;
+            if (this.dispatchesRangeChanges) {
+                this.dispatchRangeChange([], minus, start);
+            }
+            return minus.length;
+        } else {
+            return 0;
+        }
+    }
+};
+
 SortedArray.prototype.indexOf = function (value) {
     return searchFirst(this.array, value, this.contentCompare, this.contentEquals);
 };
@@ -173,6 +201,7 @@ SortedArray.prototype.find = function (value, equals, index) {
     if (index) {
         throw new Error("SortedArray#find does not support third argument: index");
     }
+    // TODO support initial partition index
     return searchFirst(this.array, value, this.contentCompare, this.contentEquals);
 };
 
@@ -183,6 +212,7 @@ SortedArray.prototype.findLast = function (value, equals, index) {
     if (index) {
         throw new Error("SortedArray#findLast does not support third argument: index");
     }
+    // TODO support initial partition index
     return searchLast(this.array, value, this.contentCompare, this.contentEquals);
 };
 
diff --git a/spec/array-spec.js b/spec/array-spec.js
index 7cfbfd8..2b8c207 100644
--- a/spec/array-spec.js
+++ b/spec/array-spec.js
@@ -286,5 +286,13 @@ describe("Array", function () {
 
    });
 
+    describe("deleteAll", function () {
+        it("should delete a range of equivalent values", function () {
+            var array = [1, 1, 1, 2, 2, 2, 3, 3, 3];
+            expect(array.deleteAll(2)).toBe(3);
+            expect(array).toEqual([1, 1, 1, 3, 3, 3]);
+        });
+    });
+
 });
 
diff --git a/spec/list-spec.js b/spec/list-spec.js
index dc8e7ad..9759351 100644
--- a/spec/list-spec.js
+++ b/spec/list-spec.js
@@ -205,6 +205,20 @@ describe("List", function () {
 
     });
 
+    describe("deleteAll", function () {
+        it("deletes all equivalent values", function () {
+            var anyEven = {
+                equals: function (that) {
+                    return that % 2 === 0;
+                }
+            };
+            var collection = List([1, 2, 3, 4, 5]);
+            expect(collection.deleteAll(anyEven)).toBe(2);
+            expect(collection.toArray()).toEqual([1, 3, 5]);
+            expect(collection.length).toBe(3);
+        });
+    });
+
     describeRangeChanges(List);
 
 });
diff --git a/spec/set.js b/spec/set.js
index 793efcc..e743d2e 100644
--- a/spec/set.js
+++ b/spec/set.js
@@ -49,6 +49,12 @@ function describeSet(Set, sorted) {
         expect(set.has(object)).toBe(false);
     });
 
+    it("can deleteAll", function () {
+        var set = new Set([0]);
+        expect(set.deleteAll(0)).toBe(1);
+        expect(set.deleteAll(0)).toBe(0);
+    });
+
     if (!sorted) {
         it("can add and delete objects from the same bucket", function () {
             var a = {id: 0}, b = {id: 1};
diff --git a/spec/sorted-array-spec.js b/spec/sorted-array-spec.js
index f3f5ae7..32e5376 100644
--- a/spec/sorted-array-spec.js
+++ b/spec/sorted-array-spec.js
@@ -19,8 +19,27 @@ describe("SortedArray", function () {
     });
 
     describe("non-uniqueness", function () {
-        var array = SortedArray([1, 2, 3, 1, 2, 3]);
-        expect(array.slice()).toEqual([1, 1, 2, 2, 3, 3]);
+        it("should retain non-unique values", function () {
+            var array = SortedArray([1, 2, 3, 1, 2, 3]);
+            expect(array.slice()).toEqual([1, 1, 2, 2, 3, 3]);
+        });
+    });
+
+    describe("deleteAll", function () {
+        it("should delete a range of equivalent values", function () {
+            var array = SortedArray([1, 1, 1, 2, 2, 2, 3, 3, 3]);
+            expect(array.deleteAll(2)).toBe(3);
+            expect(array.toArray()).toEqual([1, 1, 1, 3, 3, 3]);
+        });
+        it("deletes all equivalent values for an alternate relation", function () {
+            var equivalent = function (a, b) {
+                return a % 2 === b % 2;
+            };
+            var collection = SortedArray([1, 2, 3, 4, 5]);
+            expect(collection.deleteAll(2, equivalent)).toBe(2);
+            expect(collection.toArray()).toEqual([1, 3, 5]);
+            expect(collection.length).toBe(3);
+        });
     });
 
     // TODO test stability