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TypedArray.BYTES_PER_ELEMENT property in JavaScript
The BYTES_PER_ELEMENT property of TypedArrays represents the number of bytes each element occupies in memory. This static property helps determine the memory size of different typed array types.
Syntax
TypedArray.BYTES_PER_ELEMENT
Where TypedArray can be any typed array constructor like Int8Array, Float32Array, etc.
Example: Different TypedArray Sizes
<html>
<head>
<title>JavaScript Example</title>
</head>
<body>
<script type="text/javascript">
var sizeOfFloat32Array = Float32Array.BYTES_PER_ELEMENT;
document.write("Size of Float32Array element: " + sizeOfFloat32Array + " bytes");
document.write("<br>");
var sizeOfInt16Array = Int16Array.BYTES_PER_ELEMENT;
document.write("Size of Int16Array element: " + sizeOfInt16Array + " bytes");
document.write("<br>");
var sizeOfInt8Array = Int8Array.BYTES_PER_ELEMENT;
document.write("Size of Int8Array element: " + sizeOfInt8Array + " bytes");
document.write("<br>");
var sizeOfFloat64Array = Float64Array.BYTES_PER_ELEMENT;
document.write("Size of Float64Array element: " + sizeOfFloat64Array + " bytes");
</script>
</body>
</html>
Output
Size of Float32Array element: 4 bytes Size of Int16Array element: 2 bytes Size of Int8Array element: 1 bytes Size of Float64Array element: 8 bytes
Common TypedArray Byte Sizes
| TypedArray | BYTES_PER_ELEMENT | Value Range |
|---|---|---|
| Int8Array | 1 | -128 to 127 |
| Uint8Array | 1 | 0 to 255 |
| Int16Array | 2 | -32,768 to 32,767 |
| Uint16Array | 2 | 0 to 65,535 |
| Int32Array | 4 | -2,147,483,648 to 2,147,483,647 |
| Float32Array | 4 | 32-bit floating point |
| Float64Array | 8 | 64-bit floating point |
Practical Use Case
You can use BYTES_PER_ELEMENT to calculate the total memory usage of a typed array:
<html>
<head>
<title>Memory Calculation</title>
</head>
<body>
<script type="text/javascript">
var arr = new Float32Array(1000);
var totalBytes = arr.length * Float32Array.BYTES_PER_ELEMENT;
document.write("Array length: " + arr.length + " elements<br>");
document.write("Bytes per element: " + Float32Array.BYTES_PER_ELEMENT + "<br>");
document.write("Total memory usage: " + totalBytes + " bytes");
</script>
</body>
</html>
Output
Array length: 1000 elements Bytes per element: 4 Total memory usage: 4000 bytes
Conclusion
The BYTES_PER_ELEMENT property is essential for memory calculations and understanding the storage requirements of different typed arrays. It helps optimize memory usage in performance-critical applications.
Updated on: 2026-03-15T23:18:59+05:30
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