purify-ts - npm Package Compare versions

Comparing version 0.14.1 to 0.15.0

EitherAsync.d.ts

@@ -20,4 +20,8 @@ import { Either } from './Either';
     map<R2>(f: (value: R) => R2): EitherAsync<L, R2>;
+    /** Maps the `Left` value of `this`, acts like an identity if `this` is `Right` */
+    mapLeft<L2>(f: (value: L) => L2): EitherAsync<L2, R>;
     /** Transforms `this` with a function that returns a `EitherAsync`. Behaviour is the same as the regular Either#chain */
     chain<R2>(f: (value: R) => EitherAsync<L, R2>): EitherAsync<L, R2>;
+    /** The same as EitherAsync#chain but executes the transformation function only if the value is Left. Useful for recovering from errors */
+    chainLeft<L2>(f: (value: L) => EitherAsync<L2, R>): EitherAsync<L2, R>;
     /** Converts `this` to a MaybeAsync, discarding any error values */
@@ -24,0 +28,0 @@ toMaybeAsync(): MaybeAsync<R>;

EitherAsync.js

@@ -81,2 +81,20 @@ "use strict";
     };
+    EitherAsyncImpl.prototype.mapLeft = function (f) {
+        var _this = this;
+        return exports.EitherAsync(function (helpers) { return __awaiter(_this, void 0, void 0, function () {
+            var e_2;
+            return __generator(this, function (_a) {
+                switch (_a.label) {
+                    case 0:
+                        _a.trys.push([0, 2, , 3]);
+                        return [4 /*yield*/, this.runPromise(helpers)];
+                    case 1: return [2 /*return*/, _a.sent()];
+                    case 2:
+                        e_2 = _a.sent();
+                        throw f(e_2);
+                    case 3: return [2 /*return*/];
+                }
+            });
+        }); });
+    };
     EitherAsyncImpl.prototype.chain = function (f) {
@@ -91,4 +109,3 @@ var _this = this;
                         value = _a.sent();
-                        return [4 /*yield*/, helpers.fromPromise(f(value).run())];
-                    case 2: return [2 /*return*/, _a.sent()];
+                        return [2 /*return*/, helpers.fromPromise(f(value).run())];
                 }
@@ -98,2 +115,20 @@ });
     };
+    EitherAsyncImpl.prototype.chainLeft = function (f) {
+        var _this = this;
+        return exports.EitherAsync(function (helpers) { return __awaiter(_this, void 0, void 0, function () {
+            var e_3;
+            return __generator(this, function (_a) {
+                switch (_a.label) {
+                    case 0:
+                        _a.trys.push([0, 2, , 3]);
+                        return [4 /*yield*/, this.runPromise(helpers)];
+                    case 1: return [2 /*return*/, _a.sent()];
+                    case 2:
+                        e_3 = _a.sent();
+                        return [2 /*return*/, helpers.fromPromise(f(e_3).run())];
+                    case 3: return [2 /*return*/];
+                }
+            });
+        }); });
+    };
     EitherAsyncImpl.prototype.toMaybeAsync = function () {
@@ -100,0 +135,0 @@ var _this = this;

es/EitherAsync.d.ts

@@ -20,4 +20,8 @@ import { Either } from './Either';
     map<R2>(f: (value: R) => R2): EitherAsync<L, R2>;
+    /** Maps the `Left` value of `this`, acts like an identity if `this` is `Right` */
+    mapLeft<L2>(f: (value: L) => L2): EitherAsync<L2, R>;
     /** Transforms `this` with a function that returns a `EitherAsync`. Behaviour is the same as the regular Either#chain */
     chain<R2>(f: (value: R) => EitherAsync<L, R2>): EitherAsync<L, R2>;
+    /** The same as EitherAsync#chain but executes the transformation function only if the value is Left. Useful for recovering from errors */
+    chainLeft<L2>(f: (value: L) => EitherAsync<L2, R>): EitherAsync<L2, R>;
     /** Converts `this` to a MaybeAsync, discarding any error values */
@@ -24,0 +28,0 @@ toMaybeAsync(): MaybeAsync<R>;

es/EitherAsync.js

@@ -34,8 +34,28 @@ "use strict";
     }
+    mapLeft(f) {
+        return exports.EitherAsync(async (helpers) => {
+            try {
+                return await this.runPromise(helpers);
+            }
+            catch (e) {
+                throw f(e);
+            }
+        });
+    }
     chain(f) {
         return exports.EitherAsync(async (helpers) => {
             const value = await this.runPromise(helpers);
-            return await helpers.fromPromise(f(value).run());
+            return helpers.fromPromise(f(value).run());
         });
     }
+    chainLeft(f) {
+        return exports.EitherAsync(async (helpers) => {
+            try {
+                return await this.runPromise(helpers);
+            }
+            catch (e) {
+                return helpers.fromPromise(f(e).run());
+            }
+        });
+    }
     toMaybeAsync() {
@@ -42,0 +62,0 @@ return MaybeAsync_1.MaybeAsync(async ({ liftMaybe }) => {

package.json

 {
   "name": "purify-ts",
-  "version": "0.14.1",
+  "version": "0.15.0",
   "description": "Functional programming standard library for TypeScript ",
@@ -30,6 +30,6 @@ "main": "lib/index.js",
   "devDependencies": {
-    "@types/jest": "^24.0.0",
-    "jest": "^24.1.0",
+    "@types/jest": "^25.1.1",
+    "jest": "^25.1.0",
     "prettier": "^1.19.1",
-    "ts-jest": "^24.0.0",
+    "ts-jest": "^25.0.0",
     "typescript": "3.7.5"
@@ -36,0 +36,0 @@ },

README.md

@@ -15,3 +15,3 @@ <h3 align="center">
 Purify is a library for functional programming in TypeScript.
-It's purpose is to allow developers to use popular patterns and abstractions that are available in most functional languages.
+Its purpose is to allow developers to use popular patterns and abstractions that are available in most functional languages.
 It is also <a href="https://github.com/fantasyland/fantasy-land">Fantasy Land</a> conformant.
@@ -18,0 +18,0 @@

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Improved metrics

Total package byte prevSize

162075

increased by1.72%

Lines of code

3633

increased by1.76%

No dependency changes