_.reduce/_.foldl/_.inject definitions

lodash/lodash-tests.ts

@@ -279,6 +279,30 @@ result = <any[]>_.map(stoogesAges, 'name');
 	result = <any[]>_.collect({ 'one': 1, 'two': 2, 'three': 3 }, function(num) { return num * 3; });
 	result = <any[]>_.collect(stoogesAges, 'name');
 
+result = <any>_.reduce([1, 2, 3], function(sum, num) {
+  return sum + num;
+});
+result = <any>_.reduce({ 'a': 1, 'b': 2, 'c': 3 }, function(result, num, key) {
+  result[key] = num * 3;
+  return result;
+}, {});
+
+	result = <any>_.foldl([1, 2, 3], function(sum, num) {
+	  return sum + num;
+	});
+	result = <any>_.foldl({ 'a': 1, 'b': 2, 'c': 3 }, function(result, num, key) {
+	  result[key] = num * 3;
+	  return result;
+	}, {});
+
+	result = <any>_.inject([1, 2, 3], function(sum, num) {
+	  return sum + num;
+	});
+	result = <any>_.inject({ 'a': 1, 'b': 2, 'c': 3 }, function(result, num, key) {
+	  result[key] = num * 3;
+	  return result;
+	}, {});
+
 result = <boolean>_.some([null, 0, 'yes', false], Boolean);
 result = <boolean>_.some(foodsCombined, 'organic');
 result = <boolean>_.some(foodsCombined, { 'type': 'meat' });

lodash/lodash.d.ts

@@ -1247,6 +1247,42 @@ declare module _ {
 				collection: List<T>,
 				pluckValue: string): TResult[];
 
+	/**
+	* Reduces a collection to a value which is the accumulated result of running each 
+	* element in the collection through the callback, where each successive callback execution 
+	* consumes the return value of the previous execution. If accumulator is not provided the 
+	* first element of the collection will be used as the initial accumulator value. The callback 
+	* is bound to thisArg and invoked with four arguments; (accumulator, value, index|key, collection).
+	* @param collection The collection to iterate over.
+	* @param callback The function called per iteration.
+	* @param accumulator Initial value of the accumulator.
+	* @param thisArg The this binding of callback.
+	* @return Returns the accumulated value.
+	**/
+	export function reduce<T, TResult>(
+		collection: Collection<T>,
+		callback: MemoIterator<T, TResult>,
+		accumulator?: TResult,
+		thisArg?: any): TResult;
+
+		/**
+		* @see _.reduce
+		**/
+		export function inject<T, TResult>(
+			collection: Collection<T>,
+			callback: MemoIterator<T, TResult>,
+			accumulator?: TResult,
+			thisArg?: any): TResult;
+
+		/**
+		* @see _.reduce
+		**/
+		export function foldl<T, TResult>(
+			collection: Collection<T>,
+			callback: MemoIterator<T, TResult>,
+			accumulator?: TResult,
+			thisArg?: any): TResult;
+
 	/**
 	* Checks if the callback returns a truey value for any element of a collection. The function 
 	* returns as soon as it finds a passing value and does not iterate over the entire collection. 
@@ -1330,41 +1366,6 @@ declare module _ {
 
 
 	
-
-	/**
-	* Also known as inject and foldl, reduce boils down a list of values into a single value.
-	* Memo is the initial state of the reduction, and each successive step of it should be
-	* returned by iterator. The iterator is passed four arguments: the memo, then the value
-	* and index (or key) of the iteration, and finally a reference to the entire list.
-	* @param list Reduces the elements of this array.
-	* @param iterator Reduce iterator function for each element in `list`.
-	* @param memo Initial reduce state.
-	* @param context `this` object in `iterator`, optional.
-	* @return Reduced object result.
-	**/
-	export function reduce<T, TResult>(
-		list: Collection<T>,
-		iterator: MemoIterator<T, TResult>,
-		memo?: TResult,
-		context?: any): TResult;
-
-	/**
-	* @see _.reduce
-	**/
-	export function inject<T, TResult>(
-		list: Collection<T>,
-		iterator: MemoIterator<T, TResult>,
-		memo?: TResult,
-		context?: any): TResult;
-
-	/**
-	* @see _.reduce
-	**/
-	export function foldl<T, TResult>(
-		list: Collection<T>,
-		iterator: MemoIterator<T, TResult>,
-		memo?: TResult,
-		context?: any): TResult;
 
 	/**
 	* The right-associative version of reduce. Delegates to the JavaScript 1.8 version of