diff --git a/package-lock.json b/package-lock.json
index 6b96505..7c86655 100644
--- a/package-lock.json
+++ b/package-lock.json
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-      "integrity": "sha1-XHHDTLW61dzr4+oM0IIHulqhrqQ=",
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/union-value/-/union-value-1.0.1.tgz",
+      "integrity": "sha512-tJfXmxMeWYnczCVs7XAEvIV7ieppALdyepWMkHkwciRpZraG/xwT+s2JN8+pr1+8jCRf80FFzvr+MpQeeoF4Xg==",
       "dev": true,
       "requires": {
         "arr-union": "^3.1.0",
         "get-value": "^2.0.6",
         "is-extendable": "^0.1.1",
-        "set-value": "^0.4.3"
-      },
-      "dependencies": {
-        "extend-shallow": {
-          "version": "2.0.1",
-          "resolved": "https://registry.npmjs.org/extend-shallow/-/extend-shallow-2.0.1.tgz",
-          "integrity": "sha1-Ua99YUrZqfYQ6huvu5idaxxWiQ8=",
-          "dev": true,
-          "requires": {
-            "is-extendable": "^0.1.0"
-          }
-        },
-        "set-value": {
-          "version": "0.4.3",
-          "resolved": "https://registry.npmjs.org/set-value/-/set-value-0.4.3.tgz",
-          "integrity": "sha1-fbCPnT0i3H945Trzw79GZuzfzPE=",
-          "dev": true,
-          "requires": {
-            "extend-shallow": "^2.0.1",
-            "is-extendable": "^0.1.1",
-            "is-plain-object": "^2.0.1",
-            "to-object-path": "^0.3.0"
-          }
-        }
+        "set-value": "^2.0.1"
       }
     },
     "unique-filename": {
@@ -13598,12 +12751,6 @@
       "integrity": "sha1-fx8wIFWz/qDz6B3HjrNnZstl4/E=",
       "dev": true
     },
-    "upath": {
-      "version": "1.0.4",
-      "resolved": "https://registry.npmjs.org/upath/-/upath-1.0.4.tgz",
-      "integrity": "sha512-d4SJySNBXDaQp+DPrziv3xGS6w3d2Xt69FijJr86zMPBy23JEloMCEOUBBzuN7xCtjLCnmB9tI/z7SBCahHBOw==",
-      "dev": true
-    },
     "uri-js": {
       "version": "3.0.2",
       "resolved": "https://registry.npmjs.org/uri-js/-/uri-js-3.0.2.tgz",
@@ -13729,9 +12876,9 @@
       "dev": true
     },
     "validate-npm-package-license": {
-      "version": "3.0.3",
-      "resolved": "https://registry.npmjs.org/validate-npm-package-license/-/validate-npm-package-license-3.0.3.tgz",
-      "integrity": "sha512-63ZOUnL4SIXj4L0NixR3L1lcjO38crAbgrTpl28t8jjrfuiOBL5Iygm+60qPs/KsZGzPNg6Smnc/oY16QTjF0g==",
+      "version": "3.0.4",
+      "resolved": "https://registry.npmjs.org/validate-npm-package-license/-/validate-npm-package-license-3.0.4.tgz",
+      "integrity": "sha512-DpKm2Ui/xN7/HQKCtpZxoRWBhZ9Z0kqtygG8XCgNQ8ZlDnxuQmWhj566j8fN4Cu3/JmbhsDo7fcAJq4s9h27Ew==",
       "dev": true,
       "requires": {
         "spdx-correct": "^3.0.0",
@@ -13816,6 +12963,17 @@
       "integrity": "sha1-wGavtYK7HLQSjWDqkjkulNXp2+w=",
       "dev": true
     },
+    "watchpack": {
+      "version": "1.6.0",
+      "resolved": "https://registry.npmjs.org/watchpack/-/watchpack-1.6.0.tgz",
+      "integrity": "sha512-i6dHe3EyLjMmDlU1/bGQpEw25XSjkJULPuAVKCbNRefQVq48yXKUpwg538F7AZTf9kyr57zj++pQFltUa5H7yA==",
+      "dev": true,
+      "requires": {
+        "chokidar": "^2.0.2",
+        "graceful-fs": "^4.1.2",
+        "neo-async": "^2.5.0"
+      }
+    },
     "webpack": {
       "version": "4.6.0",
       "resolved": "https://registry.npmjs.org/webpack/-/webpack-4.6.0.tgz",
@@ -13876,16 +13034,6 @@
           "integrity": "sha1-rCsnk5xUPpXSwG5/f1wnvkqlQ74=",
           "dev": true
         },
-        "anymatch": {
-          "version": "2.0.0",
-          "resolved": "https://registry.npmjs.org/anymatch/-/anymatch-2.0.0.tgz",
-          "integrity": "sha512-5teOsQWABXHHBFP9y3skS5P3d/WfWXpv3FUpy+LorMrNYaT9pI4oLMQX7jzQ2KklNpGpWHzdCXTDT2Y3XGlZBw==",
-          "dev": true,
-          "requires": {
-            "micromatch": "^3.1.4",
-            "normalize-path": "^2.1.1"
-          }
-        },
         "arr-diff": {
           "version": "4.0.0",
           "resolved": "https://registry.npmjs.org/arr-diff/-/arr-diff-4.0.0.tgz",
@@ -13933,26 +13081,6 @@
             }
           }
         },
-        "chokidar": {
-          "version": "2.0.3",
-          "resolved": "https://registry.npmjs.org/chokidar/-/chokidar-2.0.3.tgz",
-          "integrity": "sha512-zW8iXYZtXMx4kux/nuZVXjkLP+CyIK5Al5FHnj1OgTKGZfp4Oy6/ymtMSKFv3GD8DviEmUPmJg9eFdJ/JzudMg==",
-          "dev": true,
-          "requires": {
-            "anymatch": "^2.0.0",
-            "async-each": "^1.0.0",
-            "braces": "^2.3.0",
-            "fsevents": "^1.1.2",
-            "glob-parent": "^3.1.0",
-            "inherits": "^2.0.1",
-            "is-binary-path": "^1.0.0",
-            "is-glob": "^4.0.0",
-            "normalize-path": "^2.1.1",
-            "path-is-absolute": "^1.0.0",
-            "readdirp": "^2.0.0",
-            "upath": "^1.0.0"
-          }
-        },
         "enhanced-resolve": {
           "version": "4.0.0",
           "resolved": "https://registry.npmjs.org/enhanced-resolve/-/enhanced-resolve-4.0.0.tgz",
@@ -14115,39 +13243,12 @@
             }
           }
         },
-        "glob-parent": {
-          "version": "3.1.0",
-          "resolved": "https://registry.npmjs.org/glob-parent/-/glob-parent-3.1.0.tgz",
-          "integrity": "sha1-nmr2KZ2NO9K9QEMIMr0RPfkGxa4=",
-          "dev": true,
-          "requires": {
-            "is-glob": "^3.1.0",
-            "path-dirname": "^1.0.0"
-          },
-          "dependencies": {
-            "is-glob": {
-              "version": "3.1.0",
-              "resolved": "https://registry.npmjs.org/is-glob/-/is-glob-3.1.0.tgz",
-              "integrity": "sha1-e6WuJCF4BKxwcHuWkiVnSGzD6Eo=",
-              "dev": true,
-              "requires": {
-                "is-extglob": "^2.1.0"
-              }
-            }
-          }
-        },
         "graceful-fs": {
           "version": "4.1.11",
           "resolved": "https://registry.npmjs.org/graceful-fs/-/graceful-fs-4.1.11.tgz",
           "integrity": "sha1-Dovf5NHduIVNZOBOp8AOKgJuVlg=",
           "dev": true
         },
-        "inherits": {
-          "version": "2.0.3",
-          "resolved": "https://registry.npmjs.org/inherits/-/inherits-2.0.3.tgz",
-          "integrity": "sha1-Yzwsg+PaQqUC9SRmAiSA9CCCYd4=",
-          "dev": true
-        },
         "is-accessor-descriptor": {
           "version": "1.0.0",
           "resolved": "https://registry.npmjs.org/is-accessor-descriptor/-/is-accessor-descriptor-1.0.0.tgz",
@@ -14183,21 +13284,6 @@
             "kind-of": "^6.0.2"
           }
         },
-        "is-extglob": {
-          "version": "2.1.1",
-          "resolved": "https://registry.npmjs.org/is-extglob/-/is-extglob-2.1.1.tgz",
-          "integrity": "sha1-qIwCU1eR8C7TfHahueqXc8gz+MI=",
-          "dev": true
-        },
-        "is-glob": {
-          "version": "4.0.0",
-          "resolved": "https://registry.npmjs.org/is-glob/-/is-glob-4.0.0.tgz",
-          "integrity": "sha1-lSHHaEXMJhCoUgPd8ICpWML/q8A=",
-          "dev": true,
-          "requires": {
-            "is-extglob": "^2.1.1"
-          }
-        },
         "is-number": {
           "version": "3.0.0",
           "resolved": "https://registry.npmjs.org/is-number/-/is-number-3.0.0.tgz",
@@ -14262,12 +13348,6 @@
             "to-regex": "^3.0.2"
           }
         },
-        "path-is-absolute": {
-          "version": "1.0.1",
-          "resolved": "https://registry.npmjs.org/path-is-absolute/-/path-is-absolute-1.0.1.tgz",
-          "integrity": "sha1-F0uSaHNVNP+8es5r9TpanhtcX18=",
-          "dev": true
-        },
         "repeat-string": {
           "version": "1.6.1",
           "resolved": "https://registry.npmjs.org/repeat-string/-/repeat-string-1.6.1.tgz",
@@ -14292,17 +13372,6 @@
           "integrity": "sha512-dQRhbNQkRnaqauC7WqSJ21EEksgT0fYZX2lqXzGkpo8JNig9zGZTYoMGvyI2nWmXlE2VSVXVDu7wLVGu/mQEsg==",
           "dev": true
         },
-        "watchpack": {
-          "version": "1.5.0",
-          "resolved": "https://registry.npmjs.org/watchpack/-/watchpack-1.5.0.tgz",
-          "integrity": "sha512-RSlipNQB1u48cq0wH/BNfCu1tD/cJ8ydFIkNYhp9o+3d+8unClkIovpW5qpFPgmL9OE48wfAnlZydXByWP82AA==",
-          "dev": true,
-          "requires": {
-            "chokidar": "^2.0.2",
-            "graceful-fs": "^4.1.2",
-            "neo-async": "^2.5.0"
-          }
-        },
         "webpack-sources": {
           "version": "1.1.0",
           "resolved": "https://registry.npmjs.org/webpack-sources/-/webpack-sources-1.1.0.tgz",
@@ -14769,26 +13838,26 @@
       }
     },
     "yeoman-generator": {
-      "version": "2.0.4",
-      "resolved": "https://registry.npmjs.org/yeoman-generator/-/yeoman-generator-2.0.4.tgz",
-      "integrity": "sha512-Sgvz3MAkOpEIobcpW3rjEl6bOTNnl8SkibP9z7hYKfIGIlw0QDC2k0MAeXvyE2pLqc2M0Duql+6R7/W9GrJojg==",
+      "version": "2.0.5",
+      "resolved": "https://registry.npmjs.org/yeoman-generator/-/yeoman-generator-2.0.5.tgz",
+      "integrity": "sha512-rV6tJ8oYzm4mmdF2T3wjY+Q42jKF2YiiD0VKfJ8/0ZYwmhCKC9Xs2346HVLPj/xE13i68psnFJv7iS6gWRkeAg==",
       "dev": true,
       "requires": {
         "async": "^2.6.0",
         "chalk": "^2.3.0",
         "cli-table": "^0.3.1",
-        "cross-spawn": "^5.1.0",
+        "cross-spawn": "^6.0.5",
         "dargs": "^5.1.0",
-        "dateformat": "^3.0.2",
+        "dateformat": "^3.0.3",
         "debug": "^3.1.0",
         "detect-conflict": "^1.0.0",
         "error": "^7.0.2",
         "find-up": "^2.1.0",
         "github-username": "^4.0.0",
-        "istextorbinary": "^2.1.0",
-        "lodash": "^4.17.4",
+        "istextorbinary": "^2.2.1",
+        "lodash": "^4.17.10",
         "make-dir": "^1.1.0",
-        "mem-fs-editor": "^3.0.2",
+        "mem-fs-editor": "^4.0.0",
         "minimist": "^1.2.0",
         "pretty-bytes": "^4.0.2",
         "read-chunk": "^2.1.0",
@@ -14811,18 +13880,18 @@
           }
         },
         "async": {
-          "version": "2.6.0",
-          "resolved": "https://registry.npmjs.org/async/-/async-2.6.0.tgz",
-          "integrity": "sha512-xAfGg1/NTLBBKlHFmnd7PlmUW9KhVQIUuSrYem9xzFUZy13ScvtyGGejaae9iAVRiRq9+Cx7DPFaAAhCpyxyPw==",
+          "version": "2.6.3",
+          "resolved": "https://registry.npmjs.org/async/-/async-2.6.3.tgz",
+          "integrity": "sha512-zflvls11DCy+dQWzTW2dzuilv8Z5X/pjfmZOWba6TNIVDm+2UDaJmXSOXlasHKfNBs8oo3M0aT50fDEWfKZjXg==",
           "dev": true,
           "requires": {
-            "lodash": "^4.14.0"
+            "lodash": "^4.17.14"
           }
         },
         "chalk": {
-          "version": "2.4.0",
-          "resolved": "https://registry.npmjs.org/chalk/-/chalk-2.4.0.tgz",
-          "integrity": "sha512-Wr/w0f4o9LuE7K53cD0qmbAMM+2XNLzR29vFn5hqko4sxGlUsyy363NvmyGIyk5tpe9cjTr9SJYbysEyPkRnFw==",
+          "version": "2.4.2",
+          "resolved": "https://registry.npmjs.org/chalk/-/chalk-2.4.2.tgz",
+          "integrity": "sha512-Mti+f9lpJNcwF4tWV8/OrTTtF1gZi+f8FqlyAdouralcFWFQWF2+NgCHShjkCb+IFBLq9buZwE1xckQU4peSuQ==",
           "dev": true,
           "requires": {
             "ansi-styles": "^3.2.1",
@@ -14830,32 +13899,15 @@
             "supports-color": "^5.3.0"
           }
         },
-        "cross-spawn": {
-          "version": "5.1.0",
-          "resolved": "https://registry.npmjs.org/cross-spawn/-/cross-spawn-5.1.0.tgz",
-          "integrity": "sha1-6L0O/uWPz/b4+UUQoKVUu/ojVEk=",
-          "dev": true,
-          "requires": {
-            "lru-cache": "^4.0.1",
-            "shebang-command": "^1.2.0",
-            "which": "^1.2.9"
-          }
-        },
         "debug": {
-          "version": "3.1.0",
-          "resolved": "https://registry.npmjs.org/debug/-/debug-3.1.0.tgz",
-          "integrity": "sha512-OX8XqP7/1a9cqkxYw2yXss15f26NKWBpDXQd0/uK/KPqdQhxbPa994hnzjcE2VqQpDslf55723cKPUOGSmMY3g==",
+          "version": "3.2.6",
+          "resolved": "https://registry.npmjs.org/debug/-/debug-3.2.6.tgz",
+          "integrity": "sha512-mel+jf7nrtEl5Pn1Qx46zARXKDpBbvzezse7p7LqINmdoIk8PYP5SySaxEmYv6TZ0JyEKA1hsCId6DIhgITtWQ==",
           "dev": true,
           "requires": {
-            "ms": "2.0.0"
+            "ms": "^2.1.1"
           }
         },
-        "escape-string-regexp": {
-          "version": "1.0.5",
-          "resolved": "https://registry.npmjs.org/escape-string-regexp/-/escape-string-regexp-1.0.5.tgz",
-          "integrity": "sha1-G2HAViGQqN/2rjuyzwIAyhMLhtQ=",
-          "dev": true
-        },
         "has-flag": {
           "version": "3.0.0",
           "resolved": "https://registry.npmjs.org/has-flag/-/has-flag-3.0.0.tgz",
@@ -14868,10 +13920,16 @@
           "integrity": "sha1-o1AIsg9BOD7sH7kU9M1d95omQoQ=",
           "dev": true
         },
+        "ms": {
+          "version": "2.1.2",
+          "resolved": "https://registry.npmjs.org/ms/-/ms-2.1.2.tgz",
+          "integrity": "sha512-sGkPx+VjMtmA6MX27oA4FBFELFCZZ4S4XqeGOXCv68tT+jb3vk/RyaKWP0PTKyWtmLSM0b+adUTEvbs1PEaH2w==",
+          "dev": true
+        },
         "supports-color": {
-          "version": "5.4.0",
-          "resolved": "https://registry.npmjs.org/supports-color/-/supports-color-5.4.0.tgz",
-          "integrity": "sha512-zjaXglF5nnWpsq470jSv6P9DwPvgLkuapYmfDm3JWOm0vkNTVF2tI4UrN2r6jH1qM/uc/WtxYY1hYoA2dOKj5w==",
+          "version": "5.5.0",
+          "resolved": "https://registry.npmjs.org/supports-color/-/supports-color-5.5.0.tgz",
+          "integrity": "sha512-QjVjwdXIt408MIiAqCX4oUKsgU2EqAGzs2Ppkm4aQYbjm+ZEWEcW4SfFNTr4uMNZma0ey4f5lgLrkB0aX0QMow==",
           "dev": true,
           "requires": {
             "has-flag": "^3.0.0"
diff --git a/src/parsimmon.js b/src/parsimmon.js
index 114a7ba..66b4456 100644
--- a/src/parsimmon.js
+++ b/src/parsimmon.js
@@ -849,6 +849,12 @@ _.tryParse = function(str) {
   }
 };
 
+_.assert = function(condition, errorMessage) {
+  return this.chain(function(value) {
+    return condition(value) ? succeed(value) : fail(errorMessage);
+  });
+};
+
 _.or = function(alternative) {
   return alt(this, alternative);
 };
diff --git a/test/core/assert.test.js b/test/core/assert.test.js
new file mode 100644
index 0000000..40ca454
--- /dev/null
+++ b/test/core/assert.test.js
@@ -0,0 +1,18 @@
+"use strict";
+
+describe("assert", function() {
+  it("fails if given condition is false", function() {
+    function condition1() {
+      return false;
+    }
+    function condition2() {
+      return true;
+    }
+    var p1 = Parsimmon.string("a").assert(condition1, "parsing error");
+    var p2 = Parsimmon.string("a").assert(condition2, "parsing error");
+    assert.deepEqual(p1.parse("a").status, false);
+    assert.deepEqual(p1.parse("a").expected, ["parsing error"]);
+    assert.deepEqual(p2.parse("a").status, true);
+    assert.deepEqual(p2.parse("a").value, "a");
+  });
+});