add test

dist/deep-copy.js

@@ -34,10 +34,7 @@ function deepCopy(obj, cache) {
     var copy = Array.isArray(obj) ? [] : {};
     // put the copy into cache at first
     // because we want to refer it in recursive deepCopy
-    cache.push({
+    cache.push({ original: obj, copy: copy });
-        original: obj,
-        copy: copy
-    });
     Object.keys(obj).forEach(function (key) {
         copy[key] = deepCopy(obj[key], cache);
     });

dist/deep-copy.js.map

@@ -1 +1 @@
-{"version":3,"file":"deep-copy.js","sourceRoot":"","sources":["../src/deep-copy.ts"],"names":[],"mappings":";;AAAA;;;;;;;GAOG;AACH,cAAc,IAAI,EAAE,CAAC;IACjB,MAAM,CAAC,IAAI,CAAC,MAAM,CAAC,CAAC,CAAC,CAAC,CAAC,CAAC,CAAA;AAC5B,CAAC;AAED;;;;;;;;GAQG;AACH,kBAA4B,GAAM,EAAE,KAAU;IAAV,sBAAA,EAAA,UAAU;IAC1C,wCAAwC;IACxC,EAAE,CAAC,CAAC,GAAG,KAAK,IAAI,IAAI,OAAO,GAAG,KAAK,QAAQ,CAAC,CAAC,CAAC;QAC1C,MAAM,CAAC,GAAG,CAAA;IACd,CAAC;IAED,6CAA6C;IAC7C,IAAM,GAAG,GAAG,IAAI,CAAC,KAAK,EAAE,UAAA,CAAC,IAAI,OAAA,CAAC,CAAC,QAAQ,KAAK,GAAG,EAAlB,CAAkB,CAAC,CAAA;IAChD,EAAE,CAAC,CAAC,GAAG,CAAC,CAAC,CAAC;QACN,MAAM,CAAC,GAAG,CAAC,IAAI,CAAA;IACnB,CAAC;IAED,IAAM,IAAI,GAAG,KAAK,CAAC,OAAO,CAAC,GAAG,CAAC,GAAG,EAAE,GAAG,EAAE,CAAA;IACzC,mCAAmC;IACnC,oDAAoD;IACpD,KAAK,CAAC,IAAI,CAAC;QACP,QAAQ,EAAE,GAAG;QACb,IAAI,MAAA;KACP,CAAC,CAAA;IAEF,MAAM,CAAC,IAAI,CAAC,GAAG,CAAC,CAAC,OAAO,CAAC,UAAA,GAAG;QACxB,IAAI,CAAC,GAAG,CAAC,GAAG,QAAQ,CAAC,GAAG,CAAC,GAAG,CAAC,EAAE,KAAK,CAAC,CAAA;IACzC,CAAC,CAAC,CAAA;IAEF,MAAM,CAAI,IAAI,CAAC;AACnB,CAAC;AAzBD,4BAyBC"}
+{"version":3,"file":"deep-copy.js","sourceRoot":"","sources":["../src/deep-copy.ts"],"names":[],"mappings":";;AAAA;;;;;;;GAOG;AACH,cAAc,IAAI,EAAE,CAAC;IACjB,MAAM,CAAC,IAAI,CAAC,MAAM,CAAC,CAAC,CAAC,CAAC,CAAC,CAAC,CAAC;AAC7B,CAAC;AAED;;;;;;;;GAQG;AACH,kBAA4B,GAAM,EAAE,KAAU;IAAV,sBAAA,EAAA,UAAU;IAC1C,wCAAwC;IACxC,EAAE,CAAC,CAAC,GAAG,KAAK,IAAI,IAAI,OAAO,GAAG,KAAK,QAAQ,CAAC,CAAC,CAAC;QAC1C,MAAM,CAAC,GAAG,CAAC;IACf,CAAC;IAED,6CAA6C;IAC7C,IAAM,GAAG,GAAG,IAAI,CAAC,KAAK,EAAE,UAAA,CAAC,IAAI,OAAA,CAAC,CAAC,QAAQ,KAAK,GAAG,EAAlB,CAAkB,CAAC,CAAC;IACjD,EAAE,CAAC,CAAC,GAAG,CAAC,CAAC,CAAC;QACN,MAAM,CAAC,GAAG,CAAC,IAAI,CAAC;IACpB,CAAC;IAED,IAAM,IAAI,GAAG,KAAK,CAAC,OAAO,CAAC,GAAG,CAAC,GAAG,EAAE,GAAG,EAAE,CAAC;IAC1C,mCAAmC;IACnC,oDAAoD;IACpD,KAAK,CAAC,IAAI,CAAC,EAAE,QAAQ,EAAE,GAAG,EAAE,IAAI,MAAA,EAAE,CAAC,CAAC;IAEpC,MAAM,CAAC,IAAI,CAAC,GAAG,CAAC,CAAC,OAAO,CAAC,UAAA,GAAG;QACxB,IAAI,CAAC,GAAG,CAAC,GAAG,QAAQ,CAAC,GAAG,CAAC,GAAG,CAAC,EAAE,KAAK,CAAC,CAAC;IAC1C,CAAC,CAAC,CAAC;IAEH,MAAM,CAAI,IAAI,CAAC;AACnB,CAAC;AAtBD,4BAsBC"}

dist/test.js

@@ -0,0 +1,12 @@
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+var deep_copy_1 = require("./deep-copy");
+var a = { dataA: 10, b: null };
+var b = { dataB: 20, a: null };
+a.b = b;
+b.a = a;
+var newA = deep_copy_1.deepCopy(a);
+console.log(newA.dataA === 10); //true
+console.log(newA.b.dataB === 20); //true
+console.log(newA.b.a === newA); //true
+//# sourceMappingURL=test.js.map

dist/test.js.map

@@ -0,0 +1 @@
+{"version":3,"file":"test.js","sourceRoot":"","sources":["../src/test.ts"],"names":[],"mappings":";;AAAA,yCAAuC;AAEvC,IAAI,CAAC,GAAG,EAAE,KAAK,EAAE,EAAE,EAAE,CAAC,EAAE,IAAI,EAAE,CAAC;AAC/B,IAAI,CAAC,GAAG,EAAE,KAAK,EAAE,EAAE,EAAE,CAAC,EAAE,IAAI,EAAE,CAAC;AAC/B,CAAC,CAAC,CAAC,GAAG,CAAC,CAAC;AACR,CAAC,CAAC,CAAC,GAAG,CAAC,CAAC;AAER,IAAI,IAAI,GAAG,oBAAQ,CAAC,CAAC,CAAC,CAAC;AACvB,OAAO,CAAC,GAAG,CAAC,IAAI,CAAC,KAAK,KAAK,EAAE,CAAC,CAAC,CAAK,MAAM;AAC1C,OAAO,CAAC,GAAG,CAAC,IAAI,CAAC,CAAC,CAAC,KAAK,KAAK,EAAE,CAAC,CAAC,CAAG,MAAM;AAC1C,OAAO,CAAC,GAAG,CAAC,IAAI,CAAC,CAAC,CAAC,CAAC,KAAK,IAAI,CAAC,CAAC,CAAK,MAAM"}

package.json

@@ -1,11 +1,21 @@
 {
   "name": "fast-deep-copy",
   "version": "1.0.0",
-  "description": "",
+  "description": "20 lines code! Deep copy the given object considering circular structure",
-  "main": "index.js",
+  "main": "dist/deep-copy.js",
+  "keywords": [
+    "fast-deep-copy",
+    "deep-copy",
+    "deepcopy"
+  ],
   "scripts": {
-    "test": "echo \"Error: no test specified\" && exit 1"
+    "test": "node dist/test.js"
+  },
+  "author": "625335512@qq.com",
+  "homepage": "https://github.com/zhaolihang/fast-deep-copy",
+  "repository": {
+    "type": "git",
+    "url": "git+https://github.com/zhaolihang/fast-deep-copy.git"
   },
-  "author": "",
   "license": "ISC"
-}
+}

src/deep-copy.ts

@@ -7,7 +7,7 @@
  * @return {*}
  */
 function find(list, f) {
-    return list.filter(f)[0]
+    return list.filter(f)[0];
 }
 
 /**
@@ -22,26 +22,23 @@ function find(list, f) {
 export function deepCopy<T>(obj: T, cache = []): T {
     // just return if obj is immutable value
     if (obj === null || typeof obj !== 'object') {
-        return obj
+        return obj;
     }
 
     // if obj is hit, it is in circular structure
-    const hit = find(cache, c => c.original === obj)
+    const hit = find(cache, c => c.original === obj);
     if (hit) {
-        return hit.copy
+        return hit.copy;
     }
 
-    const copy = Array.isArray(obj) ? [] : {}
+    const copy = Array.isArray(obj) ? [] : {};
     // put the copy into cache at first
     // because we want to refer it in recursive deepCopy
-    cache.push({
+    cache.push({ original: obj, copy });
-        original: obj,
-        copy
-    })
 
     Object.keys(obj).forEach(key => {
-        copy[key] = deepCopy(obj[key], cache)
+        copy[key] = deepCopy(obj[key], cache);
-    })
+    });
 
     return <T>copy;
 }

src/test.ts

@@ -0,0 +1,11 @@
+import { deepCopy } from "./deep-copy";
+
+let a = { dataA: 10, b: null };
+let b = { dataB: 20, a: null };
+a.b = b;
+b.a = a;
+
+let newA = deepCopy(a);
+console.log(newA.dataA === 10);     //true
+console.log(newA.b.dataB === 20);   //true
+console.log(newA.b.a === newA);     //true