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TypedArray.byteOffset property in JavaScript
The byteOffset property of TypedArray returns the offset (in bytes) from the start of the ArrayBuffer where the typed array begins.
Syntax
typedArray.byteOffset
Parameters
This is a property, not a method, so it takes no parameters.
Return Value
Returns a number representing the byte offset from the beginning of the ArrayBuffer.
Example 1: TypedArray at Buffer Start
<html>
<head>
<title>JavaScript byteOffset Example</title>
</head>
<body>
<script type="text/javascript">
var buffer = new ArrayBuffer(16);
var float32 = new Float32Array(buffer);
document.write("byteOffset: " + float32.byteOffset);
</script>
</body>
</html>
byteOffset: 0
Example 2: TypedArray with Custom Offset
<html>
<head>
<title>JavaScript byteOffset with Offset</title>
</head>
<body>
<script type="text/javascript">
var buffer = new ArrayBuffer(24);
// Create TypedArray starting at byte offset 8
var int16 = new Int16Array(buffer, 8);
document.write("Buffer size: " + buffer.byteLength + " bytes<br>");
document.write("TypedArray starts at byte offset: " + int16.byteOffset);
</script>
</body>
</html>
Buffer size: 24 bytes TypedArray starts at byte offset: 8
Key Points
- byteOffset is a read-only property
- Returns 0 when TypedArray starts at the beginning of ArrayBuffer
- Useful for debugging and understanding memory layout
- Works with all TypedArray types (Int8Array, Float64Array, etc.)
Conclusion
The byteOffset property helps you determine where a TypedArray starts within its underlying ArrayBuffer. This is essential for memory management and working with shared buffer data.
Updated on: 2026-03-15T23:18:59+05:30
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