collections

package-lock.json

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-            "leven": "2.1.0",
-            "pretty-format": "21.2.1"
-          }
-        },
-        "pretty-format": {
-          "version": "21.2.1",
-          "resolved": "https://registry.npmjs.org/pretty-format/-/pretty-format-21.2.1.tgz",
-          "integrity": "sha512-ZdWPGYAnYfcVP8yKA3zFjCn8s4/17TeYH28MXuC8vTp0o21eXjbFGcOAXZEaDaOFJjc3h2qa7HQNHNshhvoh2A==",
-          "dev": true,
-          "requires": {
-            "ansi-regex": "3.0.0",
-            "ansi-styles": "3.2.0"
-          }
-        },
-        "strip-bom": {
-          "version": "3.0.0",
-          "resolved": "https://registry.npmjs.org/strip-bom/-/strip-bom-3.0.0.tgz",
-          "integrity": "sha1-IzTBjpx1n3vdVv3vfprj1YjmjtM=",
-          "dev": true
         }
       }
     },
+    "jest-changed-files": {
+      "version": "21.2.0",
+      "resolved": "https://registry.npmjs.org/jest-changed-files/-/jest-changed-files-21.2.0.tgz",
+      "integrity": "sha512-+lCNP1IZLwN1NOIvBcV5zEL6GENK6TXrDj4UxWIeLvIsIDa+gf6J7hkqsW2qVVt/wvH65rVvcPwqXdps5eclTQ==",
+      "dev": true,
+      "requires": {
+        "throat": "4.1.0"
+      }
+    },
     "jest-config": {
       "version": "21.2.1",
       "resolved": "https://registry.npmjs.org/jest-config/-/jest-config-21.2.1.tgz",
@@ -2493,6 +2273,12 @@
         "pretty-format": "21.2.1"
       }
     },
+    "jest-docblock": {
+      "version": "21.2.0",
+      "resolved": "https://registry.npmjs.org/jest-docblock/-/jest-docblock-21.2.0.tgz",
+      "integrity": "sha512-5IZ7sY9dBAYSV+YjQ0Ovb540Ku7AO9Z5o2Cg789xj167iQuZ2cG+z0f3Uct6WeYLbU6aQiM2pCs7sZ+4dotydw==",
+      "dev": true
+    },
     "jest-environment-jsdom": {
       "version": "21.2.1",
       "resolved": "https://registry.npmjs.org/jest-environment-jsdom/-/jest-environment-jsdom-21.2.1.tgz",
@@ -2520,6 +2306,20 @@
       "integrity": "sha512-y2fFw3C+D0yjNSDp7ab1kcd6NUYfy3waPTlD8yWkAtiocJdBRQqNoRqVfMNxgj+IjT0V5cBIHJO0z9vuSSZ43Q==",
       "dev": true
     },
+    "jest-haste-map": {
+      "version": "21.2.0",
+      "resolved": "https://registry.npmjs.org/jest-haste-map/-/jest-haste-map-21.2.0.tgz",
+      "integrity": "sha512-5LhsY/loPH7wwOFRMs+PT4aIAORJ2qwgbpMFlbWbxfN0bk3ZCwxJ530vrbSiTstMkYLao6JwBkLhCJ5XbY7ZHw==",
+      "dev": true,
+      "requires": {
+        "fb-watchman": "2.0.0",
+        "graceful-fs": "4.1.11",
+        "jest-docblock": "21.2.0",
+        "micromatch": "2.3.11",
+        "sane": "2.0.0",
+        "worker-farm": "1.5.0"
+      }
+    },
     "jest-jasmine2": {
       "version": "21.2.1",
       "resolved": "https://registry.npmjs.org/jest-jasmine2/-/jest-jasmine2-21.2.1.tgz",
@@ -2581,6 +2381,66 @@
         "is-builtin-module": "1.0.0"
       }
     },
+    "jest-resolve-dependencies": {
+      "version": "21.2.0",
+      "resolved": "https://registry.npmjs.org/jest-resolve-dependencies/-/jest-resolve-dependencies-21.2.0.tgz",
+      "integrity": "sha512-ok8ybRFU5ScaAcfufIQrCbdNJSRZ85mkxJ1EhUp8Bhav1W1/jv/rl1Q6QoVQHObNxmKnbHVKrfLZbCbOsXQ+bQ==",
+      "dev": true,
+      "requires": {
+        "jest-regex-util": "21.2.0"
+      }
+    },
+    "jest-runner": {
+      "version": "21.2.1",
+      "resolved": "https://registry.npmjs.org/jest-runner/-/jest-runner-21.2.1.tgz",
+      "integrity": "sha512-Anb72BOQlHqF/zETqZ2K20dbYsnqW/nZO7jV8BYENl+3c44JhMrA8zd1lt52+N7ErnsQMd2HHKiVwN9GYSXmrg==",
+      "dev": true,
+      "requires": {
+        "jest-config": "21.2.1",
+        "jest-docblock": "21.2.0",
+        "jest-haste-map": "21.2.0",
+        "jest-jasmine2": "21.2.1",
+        "jest-message-util": "21.2.1",
+        "jest-runtime": "21.2.1",
+        "jest-util": "21.2.1",
+        "pify": "3.0.0",
+        "throat": "4.1.0",
+        "worker-farm": "1.5.0"
+      }
+    },
+    "jest-runtime": {
+      "version": "21.2.1",
+      "resolved": "https://registry.npmjs.org/jest-runtime/-/jest-runtime-21.2.1.tgz",
+      "integrity": "sha512-6omlpA3+NSE+rHwD0PQjNEjZeb2z+oRmuehMfM1tWQVum+E0WV3pFt26Am0DUfQkkPyTABvxITRjCUclYgSOsA==",
+      "dev": true,
+      "requires": {
+        "babel-core": "6.26.0",
+        "babel-jest": "21.2.0",
+        "babel-plugin-istanbul": "4.1.5",
+        "chalk": "2.1.0",
+        "convert-source-map": "1.5.0",
+        "graceful-fs": "4.1.11",
+        "jest-config": "21.2.1",
+        "jest-haste-map": "21.2.0",
+        "jest-regex-util": "21.2.0",
+        "jest-resolve": "21.2.0",
+        "jest-util": "21.2.1",
+        "json-stable-stringify": "1.0.1",
+        "micromatch": "2.3.11",
+        "slash": "1.0.0",
+        "strip-bom": "3.0.0",
+        "write-file-atomic": "2.3.0",
+        "yargs": "9.0.1"
+      },
+      "dependencies": {
+        "strip-bom": {
+          "version": "3.0.0",
+          "resolved": "https://registry.npmjs.org/strip-bom/-/strip-bom-3.0.0.tgz",
+          "integrity": "sha1-IzTBjpx1n3vdVv3vfprj1YjmjtM=",
+          "dev": true
+        }
+      }
+    },
     "jest-snapshot": {
       "version": "21.2.1",
       "resolved": "https://registry.npmjs.org/jest-snapshot/-/jest-snapshot-21.2.1.tgz",
@@ -3685,92 +3545,12 @@
       "requires": {
         "buble": "0.16.0",
         "rollup-pluginutils": "2.0.1"
-      },
-      "dependencies": {
-        "acorn": {
-          "version": "3.3.0",
-          "resolved": "https://registry.npmjs.org/acorn/-/acorn-3.3.0.tgz",
-          "integrity": "sha1-ReN/s56No/JbruP/U2niu18iAXo=",
-          "dev": true
-        },
-        "ansi-styles": {
-          "version": "2.2.1",
-          "resolved": "https://registry.npmjs.org/ansi-styles/-/ansi-styles-2.2.1.tgz",
-          "integrity": "sha1-tDLdM1i2NM914eRmQ2gkBTPB3b4=",
-          "dev": true
-        },
-        "buble": {
-          "version": "0.16.0",
-          "resolved": "https://registry.npmjs.org/buble/-/buble-0.16.0.tgz",
-          "integrity": "sha512-Eb5vt1+IvXXPyYD1IIQIuaBwIuJOSWQ2kXzULlg5I83aLGF2qzcjRU2joYusnWFgAenvJ9xTOMvZvT0bb8BLbg==",
-          "dev": true,
-          "requires": {
-            "acorn": "3.3.0",
-            "acorn-jsx": "3.0.1",
-            "acorn-object-spread": "1.0.0",
-            "chalk": "1.1.3",
-            "magic-string": "0.14.0",
-            "minimist": "1.2.0",
-            "os-homedir": "1.0.2",
-            "vlq": "0.2.2"
-          }
-        },
-        "chalk": {
-          "version": "1.1.3",
-          "resolved": "https://registry.npmjs.org/chalk/-/chalk-1.1.3.tgz",
-          "integrity": "sha1-qBFcVeSnAv5NFQq9OHKCKn4J/Jg=",
-          "dev": true,
-          "requires": {
-            "ansi-styles": "2.2.1",
-            "escape-string-regexp": "1.0.5",
-            "has-ansi": "2.0.0",
-            "strip-ansi": "3.0.1",
-            "supports-color": "2.0.0"
-          }
-        },
-        "estree-walker": {
-          "version": "0.3.1",
-          "resolved": "https://registry.npmjs.org/estree-walker/-/estree-walker-0.3.1.tgz",
-          "integrity": "sha1-5rGlHPcpJSTnI3wxLl/mZgwc4ao=",
-          "dev": true
-        },
-        "minimist": {
-          "version": "1.2.0",
-          "resolved": "https://registry.npmjs.org/minimist/-/minimist-1.2.0.tgz",
-          "integrity": "sha1-o1AIsg9BOD7sH7kU9M1d95omQoQ=",
-          "dev": true
-        },
-        "rollup-pluginutils": {
-          "version": "2.0.1",
-          "resolved": "https://registry.npmjs.org/rollup-pluginutils/-/rollup-pluginutils-2.0.1.tgz",
-          "integrity": "sha1-fslbNXP2VDpGpkYb2afFRFJdD8A=",
-          "dev": true,
-          "requires": {
-            "estree-walker": "0.3.1",
-            "micromatch": "2.3.11"
-          }
-        },
-        "strip-ansi": {
-          "version": "3.0.1",
-          "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-3.0.1.tgz",
-          "integrity": "sha1-ajhfuIU9lS1f8F0Oiq+UJ43GPc8=",
-          "dev": true,
-          "requires": {
-            "ansi-regex": "2.1.1"
-          }
-        },
-        "supports-color": {
-          "version": "2.0.0",
-          "resolved": "https://registry.npmjs.org/supports-color/-/supports-color-2.0.0.tgz",
-          "integrity": "sha1-U10EXOa2Nj+kARcIRimZXp3zJMc=",
-          "dev": true
-        }
       }
     },
     "rollup-plugin-commonjs": {
-      "version": "8.2.1",
-      "resolved": "https://registry.npmjs.org/rollup-plugin-commonjs/-/rollup-plugin-commonjs-8.2.1.tgz",
-      "integrity": "sha512-ZTwAetmKimCsuWost/+n4FaOpMoczBRTx+kuQaZCIKXTx/R1wNBezuX5NS0vnPKM3hBoErdpAqmNyVSCi5XKbg==",
+      "version": "8.2.4",
+      "resolved": "https://registry.npmjs.org/rollup-plugin-commonjs/-/rollup-plugin-commonjs-8.2.4.tgz",
+      "integrity": "sha512-M1sSKg465w41VJvF0jzuc00svaG1BKSgUzrp0OQSPo/8h2l+m2vP5gqSFPr5nRbFFGhWZxnIWL7ZxQlL7AWIgQ==",
       "dev": true,
       "requires": {
         "acorn": "5.1.2",
@@ -3809,24 +3589,6 @@
           "requires": {
             "path-parse": "1.0.5"
           }
-        },
-        "rollup-pluginutils": {
-          "version": "2.0.1",
-          "resolved": "https://registry.npmjs.org/rollup-pluginutils/-/rollup-pluginutils-2.0.1.tgz",
-          "integrity": "sha1-fslbNXP2VDpGpkYb2afFRFJdD8A=",
-          "dev": true,
-          "requires": {
-            "estree-walker": "0.3.1",
-            "micromatch": "2.3.11"
-          },
-          "dependencies": {
-            "estree-walker": {
-              "version": "0.3.1",
-              "resolved": "https://registry.npmjs.org/estree-walker/-/estree-walker-0.3.1.tgz",
-              "integrity": "sha1-5rGlHPcpJSTnI3wxLl/mZgwc4ao=",
-              "dev": true
-            }
-          }
         }
       }
     },
@@ -3837,24 +3599,6 @@
       "dev": true,
       "requires": {
         "rollup-pluginutils": "2.0.1"
-      },
-      "dependencies": {
-        "estree-walker": {
-          "version": "0.3.1",
-          "resolved": "https://registry.npmjs.org/estree-walker/-/estree-walker-0.3.1.tgz",
-          "integrity": "sha1-5rGlHPcpJSTnI3wxLl/mZgwc4ao=",
-          "dev": true
-        },
-        "rollup-pluginutils": {
-          "version": "2.0.1",
-          "resolved": "https://registry.npmjs.org/rollup-pluginutils/-/rollup-pluginutils-2.0.1.tgz",
-          "integrity": "sha1-fslbNXP2VDpGpkYb2afFRFJdD8A=",
-          "dev": true,
-          "requires": {
-            "estree-walker": "0.3.1",
-            "micromatch": "2.3.11"
-          }
-        }
       }
     },
     "rollup-plugin-node-resolve": {
@@ -3869,6 +3613,16 @@
         "resolve": "1.1.7"
       }
     },
+    "rollup-pluginutils": {
+      "version": "2.0.1",
+      "resolved": "https://registry.npmjs.org/rollup-pluginutils/-/rollup-pluginutils-2.0.1.tgz",
+      "integrity": "sha1-fslbNXP2VDpGpkYb2afFRFJdD8A=",
+      "dev": true,
+      "requires": {
+        "estree-walker": "0.3.1",
+        "micromatch": "2.3.11"
+      }
+    },
     "rollup-watch": {
       "version": "4.3.1",
       "resolved": "https://registry.npmjs.org/rollup-watch/-/rollup-watch-4.3.1.tgz",
@@ -3878,24 +3632,6 @@
         "chokidar": "1.7.0",
         "require-relative": "0.8.7",
         "rollup-pluginutils": "2.0.1"
-      },
-      "dependencies": {
-        "estree-walker": {
-          "version": "0.3.1",
-          "resolved": "https://registry.npmjs.org/estree-walker/-/estree-walker-0.3.1.tgz",
-          "integrity": "sha1-5rGlHPcpJSTnI3wxLl/mZgwc4ao=",
-          "dev": true
-        },
-        "rollup-pluginutils": {
-          "version": "2.0.1",
-          "resolved": "https://registry.npmjs.org/rollup-pluginutils/-/rollup-pluginutils-2.0.1.tgz",
-          "integrity": "sha1-fslbNXP2VDpGpkYb2afFRFJdD8A=",
-          "dev": true,
-          "requires": {
-            "estree-walker": "0.3.1",
-            "micromatch": "2.3.11"
-          }
-        }
       }
     },
     "safe-buffer": {
@@ -4298,9 +4034,9 @@
       "dev": true
     },
     "ts-jest": {
-      "version": "21.1.2",
-      "resolved": "https://registry.npmjs.org/ts-jest/-/ts-jest-21.1.2.tgz",
-      "integrity": "sha512-bcYDSvjxL1ralSBxAnM1fY6D3suWDMe73feNIEDKSuM30AsRag2ktv+9YcfM+ctXVUKFFJDyxZDNsHiFTz98lQ==",
+      "version": "21.1.3",
+      "resolved": "https://registry.npmjs.org/ts-jest/-/ts-jest-21.1.3.tgz",
+      "integrity": "sha512-hTRIvxOjykHeuaNC9XkdNk+dbrt1NYzV3C6/CN4Ty9mCtBWrDLNCUtny9gKoIJS0UtwteuSmEdoLgr2biL+bDw==",
       "dev": true,
       "requires": {
         "babel-core": "6.26.0",
@@ -4339,13 +4075,14 @@
       "dev": true
     },
     "tslint": {
-      "version": "5.7.0",
-      "resolved": "https://registry.npmjs.org/tslint/-/tslint-5.7.0.tgz",
-      "integrity": "sha1-wl4NDJL6EgHCvDDoROCOaCtPNVI=",
+      "version": "5.8.0",
+      "resolved": "https://registry.npmjs.org/tslint/-/tslint-5.8.0.tgz",
+      "integrity": "sha1-H0mtWy53x2w69N3K5VKuTjYS6xM=",
       "dev": true,
       "requires": {
         "babel-code-frame": "6.26.0",
-        "colors": "1.1.2",
+        "builtin-modules": "1.1.1",
+        "chalk": "2.1.0",
         "commander": "2.11.0",
         "diff": "3.3.1",
         "glob": "7.1.2",
@@ -4353,7 +4090,7 @@
         "resolve": "1.4.0",
         "semver": "5.4.1",
         "tslib": "1.7.1",
-        "tsutils": "2.8.2"
+        "tsutils": "2.12.1"
       },
       "dependencies": {
         "resolve": {
@@ -4364,18 +4101,18 @@
           "requires": {
             "path-parse": "1.0.5"
           }
+        },
+        "tsutils": {
+          "version": "2.12.1",
+          "resolved": "https://registry.npmjs.org/tsutils/-/tsutils-2.12.1.tgz",
+          "integrity": "sha1-9Nlc4zkciXHkblTEzw7bCiHdWyQ=",
+          "dev": true,
+          "requires": {
+            "tslib": "1.7.1"
+          }
         }
       }
     },
-    "tsutils": {
-      "version": "2.8.2",
-      "resolved": "https://registry.npmjs.org/tsutils/-/tsutils-2.8.2.tgz",
-      "integrity": "sha1-LBSGukMSYIRbCsb5Aq/Z1wio6mo=",
-      "dev": true,
-      "requires": {
-        "tslib": "1.7.1"
-      }
-    },
     "tunnel-agent": {
       "version": "0.6.0",
       "resolved": "https://registry.npmjs.org/tunnel-agent/-/tunnel-agent-0.6.0.tgz",

package.json

@@ -30,19 +30,19 @@
   "license": "MIT",
   "devDependencies": {
     "@types/benchmark": "^1.0.30",
-    "@types/jest": "^21.1.3",
-    "@types/node": "^8.0.41",
+    "@types/jest": "^21.1.4",
+    "@types/node": "^8.0.46",
     "benchmark": "^2.1.4",
     "download-cli": "^1.0.5",
     "jest": "^21.2.1",
     "rollup": "^0.50.0",
     "rollup-plugin-buble": "^0.16.0",
-    "rollup-plugin-commonjs": "^8.2.1",
+    "rollup-plugin-commonjs": "^8.2.4",
     "rollup-plugin-json": "^2.3.0",
     "rollup-plugin-node-resolve": "^3.0.0",
     "rollup-watch": "^4.3.1",
-    "ts-jest": "^21.1.2",
-    "tslint": "^5.7.0",
+    "ts-jest": "^21.1.3",
+    "tslint": "^5.8.0",
     "typescript": "^2.5.3",
     "uglify-js": "^3.1.4",
     "util.promisify": "^1.0.0"

src/structure/collections/hash-set.ts

@@ -0,0 +1,50 @@
+/**
+ * Copyright (c) 2017 molio contributors, licensed under MIT, See LICENSE file for more info.
+ *
+ * @author David Sehnal <david.sehnal@gmail.com>
+ */
+
+interface SetLike<T> {
+    readonly size: number;
+    add(a: T): boolean;
+    has(a: T): boolean;
+}
+
+class HashSetImpl<T> implements SetLike<T> {
+    size: number = 0;
+    private byHash: { [hash: number]: T[] } = Object.create(null);
+
+    add(a: T) {
+        const hash = this.getHash(a);
+        if (this.byHash[hash]) {
+            const xs = this.byHash[hash];
+            for (const x of xs) {
+                if (this.areEqual(a, x)) return false;
+            }
+            xs[xs.length] = a;
+            this.size++;
+            return true;
+        } else {
+            this.byHash[hash] = [a];
+            this.size++;
+            return true;
+        }
+    }
+
+    has(v: T) {
+        const hash = this.getHash(v);
+        if (!this.byHash[hash]) return false;
+        for (const x of this.byHash[hash]) {
+            if (this.areEqual(v, x)) return true;
+        }
+        return false;
+    }
+
+    constructor(private getHash: (v: T) => any, private areEqual: (a: T, b: T) => boolean) { }
+}
+
+function HashSet<T>(getHash: (v: T) => any, areEqual: (a: T, b: T) => boolean): SetLike<T> {
+    return new HashSetImpl<T>(getHash, areEqual);
+}
+
+export default HashSet;

src/structure/collections/linked-index.ts

@@ -0,0 +1,58 @@
+/**
+ * Copyright (c) 2017 molio contributors, licensed under MIT, See LICENSE file for more info.
+ *
+ * @author David Sehnal <david.sehnal@gmail.com>
+ */
+
+/** A data structure useful for graph traversal */
+interface LinkedIndex {
+    readonly head: number,
+    has(i: number): boolean,
+    remove(i: number): void
+}
+
+function LinkedIndex(size: number): LinkedIndex {
+    return new LinkedIndexImpl(size);
+}
+
+class LinkedIndexImpl implements LinkedIndex {
+    private prev: Int32Array;
+    private next: Int32Array;
+    head: number;
+
+    remove(i: number) {
+        const { prev, next } = this;
+        const p = prev[i], n = next[i];
+        if (p >= 0) {
+            next[p] = n;
+            prev[i] = -1;
+        }
+        if (n >= 0) {
+            prev[n] = p;
+            next[i] = -1;
+        }
+        if (i === this.head) {
+            if (p < 0) this.head = n;
+            else this.head = p;
+        }
+    }
+
+    has(i: number) {
+        return this.prev[i] >= 0 || this.next[i] >= 0;
+    }
+
+    constructor(size: number) {
+        this.head = size > 0 ? 0 : -1;
+        this.prev = new Int32Array(size);
+        this.next = new Int32Array(size);
+
+        for (let i = 0; i < size; i++) {
+            this.next[i] = i + 1;
+            this.prev[i] = i - 1;
+        }
+        this.prev[0] = -1;
+        this.next[size - 1] = -1;
+    }
+}
+
+export default LinkedIndex;

src/structure/collections/linked-set.ts

@@ -1 +0,0 @@
-// TODO: fixed length doubly linked list used for graph traversal

src/structure/collections/range-set.ts

@@ -21,6 +21,29 @@ namespace RangeSet {
         toArray(): ArrayLike<number>
     }
 
+    export function hashCode(a: RangeSet) {
+        // hash of tuple (size, min, max, mid)
+        const { size } = a;
+        let hash = 23;
+        if (!size) return hash;
+        hash = 31 * hash + size;
+        hash = 31 * hash + a.elementAt(0);
+        hash = 31 * hash + a.elementAt(size - 1);
+        if (size > 2) hash = 31 * hash + a.elementAt(size >> 1);
+        return hash;
+    }
+
+    export function areEqual(a: RangeSet, b: RangeSet) {
+        if (a === b) return true;
+        if (a instanceof RangeImpl) {
+            if (b instanceof RangeImpl) return a.min === b.min && a.max === b.max;
+            return equalAR(b as ArrayImpl, a);
+        } else if (b instanceof RangeImpl) {
+            return equalAR(a as ArrayImpl, b);
+        }
+        return equalAA(a as ArrayImpl, b as ArrayImpl);
+    }
+
     export function union(a: RangeSet, b: RangeSet) {
         if (a instanceof RangeImpl) {
             if (b instanceof RangeImpl) return unionRR(a, b);
@@ -107,6 +130,20 @@ namespace RangeSet {
         return -1;
     }
 
+    function equalAR(a: ArrayImpl, b: RangeImpl) {
+        return a.size === b.size && a.min === b.min && a.max === b.max;
+    }
+
+    function equalAA(a: ArrayImpl, b: ArrayImpl) {
+        if (a.size !== b.size || a.min !== b.min || a.max !== b.max) return false;
+        const { size, values: xs } = a;
+        const { values: ys } = b;
+        for (let i = 0; i < size; i++) {
+            if (xs[i] !== ys[i]) return false;
+        }
+        return true;
+    }
+
     function areRangesIntersecting(a: Impl, b: Impl) {
         return a.size > 0 && b.size > 0 && a.max >= b.min && a.min <= b.max;
     }
@@ -150,6 +187,8 @@ namespace RangeSet {
     function unionAA(xs: ArrayLike<number>, ys: ArrayLike<number>) {
         const la = xs.length, lb = ys.length;
 
+        // sorted list merge.
+
         let i = 0, j = 0, resultSize = 0;
         while (i < la && j < lb) {
             const x = xs[i], y = ys[j];
@@ -203,6 +242,8 @@ namespace RangeSet {
     function intersectAA(xs: ArrayLike<number>, ys: ArrayLike<number>) {
         const la = xs.length, lb = ys.length;
 
+        // a variation on sorted list merge.
+
         let i = 0, j = 0, resultSize = 0;
         while (i < la && j < lb) {
             const x = xs[i], y = ys[j];

src/structure/spec/collections.spec.ts

@@ -137,6 +137,12 @@ describe('range set', () => {
     testEq('range', range, [1, 2, 3, 4]);
     testEq('sorted array', arr, [1, 3, 6]);
 
+    expect(RangeSet.areEqual(empty, singleton)).toBe(false);
+    expect(RangeSet.areEqual(singleton, singleton)).toBe(true);
+    expect(RangeSet.areEqual(range, singleton)).toBe(false);
+    expect(RangeSet.areEqual(arr, RangeSet.ofSortedArray([1, 3, 6]))).toBe(true);
+    expect(RangeSet.areEqual(arr, RangeSet.ofSortedArray([1, 4, 6]))).toBe(false);
+
     expect(empty.has(10)).toBe(false);
     expect(empty.indexOf(10)).toBe(-1);