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up vote 5 down vote favorite

As I understand ArrayBuffer length is set only by constructor and cannot be changed dynamically. So I am curious, is it possible using websockets binary data messages send arraybuffer certain part, not whole buffer?

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see also DataView() –  Zaffy Apr 10 '12 at 22:14

2 Answers 2

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You can use .slice to slice an ArrayBuffer: http://jsfiddle.net/rtaB4/21/.

var inputBuffer = new Uint8Array([0, 1, 2, 3, 4]).buffer;
var outputBuffer = inputBuffer.slice(1, 3);

console.log(outputBuffer.byteLength);       // 2
console.log(new Uint8Array(outputBuffer));  // [1, 2]
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Websocket can only send ArrayBuffer not Uint8Array or others –  Demion Dec 7 '11 at 18:43
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@Demion: I know, the input and output is an ArrayBuffer here (origBuffer and buffer). –  pimvdb Dec 7 '11 at 18:43
    
@pimvdb specification changed update your answer –  Konga Raju Sep 27 '12 at 11:53
    
@konga raju: Thanks for the heads up! –  pimvdb Sep 27 '12 at 14:21
    
But slice produce new Array. This is not GC-Friendly. Does anyone knows better way? –  ElSajko Dec 29 '14 at 20:38

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