Merge pull request #13 from Asana/all

Adding Try.all

src/optional.ts

@@ -12,6 +12,11 @@ class Optional<T> {
         return typeof value === "undefined" || value === null;
     }
 
+    /**
+     * Flattens an array of optionals by filtering out the empty optionals
+     * @param optionals The list of optionals to flatten
+     * @returns {T{]}
+     */
     public static flatten<T>(optionals: Optional<T>[]): T[] {
         return optionals.reduce((acc, elem) => {
             elem.forEach((value: T) => {

src/try.ts

@@ -7,6 +7,20 @@ class Try<T> {
     private _err: Error;
     private _value: T;
 
+    /**
+     * Attempts to flatten an array of tries
+     * @param tries The list of tries to flatten
+     * @returns {Try<T[]>}
+     */
+    static all<T>(tries: Try<T>[]): Try<T[]> {
+        return Try.attempt<T[]>(() => {
+            return tries.reduce((acc, elem) => {
+                acc.push(elem.getOrThrow());
+                return acc;
+            }, []);
+        });
+    }
+
     /**
      * Attemps a function and returns a Try for its success
      * @param fn The function to attempt

test/try_spec.ts

@@ -15,6 +15,20 @@ describe("Try", () => {
     };
     var ERR = new Error();
 
+    describe("#all", () => {
+        it("should return all of the values if there is not an exception", () => {
+            var t = tsutil.Try.success(VALUE);
+            var k = tsutil.Try.success(OTHER);
+            assert.deepEqual(tsutil.Try.all([t, k]).getOrThrow(), [VALUE, OTHER]);
+        });
+
+        it("should throw if there is an exception", () => {
+            var t = tsutil.Try.success(VALUE);
+            var k = tsutil.Try.failure(ERR);
+            assert.isTrue(tsutil.Try.all([t, k]).isFailure());
+        });
+    });
+
     describe("#attempt", () => {
         it("should return a value if successful", () => {
             var t = tsutil.Try.attempt(VALUE_ACCESSOR);