arraybuffer-slice - npm Package Compare versions

Comparing version 0.0.2 to 0.1.0

index.js

 // https://github.com/ttaubert/node-arraybuffer-slice
-// (c) 2013 Tim Taubert <[e-mail]>
+// (c) 2014 Tim Taubert <[e-mail]>
 // arraybuffer-slice may be freely distributed under the MIT license.
 
-"use strict";
+(function (undefined) {
+  "use strict";
 
-if (!ArrayBuffer.prototype.slice) {
-  ArrayBuffer.prototype.slice = function (begin, end) {
-    begin = (begin|0) || 0;
-    var num = this.byteLength;
-    end = end === (void 0) ? num : (end|0);
+  function clamp(val, length) {
+    val = (val|0) || 0;
 
-    // Handle negative values.
-    if (begin < 0) begin += num;
-    if (end < 0) end += num;
+    if (val < 0) {
+      return Math.max(val + length, 0);
+    }
 
-    if (num === 0 || begin >= num || begin >= end) {
-      return new ArrayBuffer(0);
+    if (val > length) {
+      return length;
     }
 
-    var length = Math.min(num - begin, end - begin);
-    var target = new ArrayBuffer(length);
-    var targetArray = new Uint8Array(target);
-    targetArray.set(new Uint8Array(this, begin, length));
-    return target;
-  };
-}
+    return val;
+  }
+
+  if (!ArrayBuffer.prototype.slice) {
+    ArrayBuffer.prototype.slice = function (from, to) {
+      var length = this.byteLength;
+      var begin = clamp(from, length);
+      var end = length;
+
+      if (to !== undefined) {
+        end = clamp(to, length);
+      }
+
+      if (begin > end) {
+        return new ArrayBuffer(0);
+      }
+
+      var length = end - begin;
+      var target = new ArrayBuffer(length);
+      var targetArray = new Uint8Array(target);
+
+      var sourceArray = new Uint8Array(this, begin, length);
+      targetArray.set(sourceArray);
+
+      return target;
+    };
+  }
+})();

package.json

 {
   "name": "arraybuffer-slice",
-  "version": "0.0.2",
+  "version": "0.1.0",
   "description": "Polyfill for ArrayBuffer.prototype.slice.",
   "main": "index.js",
   "devDependencies": {
-    "tape" : "~1.1.0"
+    "tape": "~2.13.1"
   },
-  "scripts" : {
-    "test" : "tape test/*.js"
+  "scripts": {
+    "test": "tape test/*.js"
   },
@@ -12,0 +12,0 @@ "keywords": [

test/index.js

 // https://github.com/ttaubert/node-arraybuffer-slice
-// (c) 2013 Tim Taubert <[e-mail]>
+// (c) 2014 Tim Taubert <[e-mail]>
 // arraybuffer-slice may be freely distributed under the MIT license.
@@ -47,2 +47,3 @@
   t.equal(buf.slice(-4, -2).byteLength, 2);
+  t.equal(buf.slice(-1000, 5).byteLength, 5);
 
@@ -49,0 +50,0 @@ deepEqual(t, buf.slice(5), [5,6,7,8,9]);

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Improved metrics

Total package byte prevSize

4428

increased by6.09%

Lines of code

77

increased by22.22%

No dependency changes