File size: 2,048 Bytes
780c9fe |
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 |
---
title: DataView.prototype.getFloat16()
short-title: getFloat16()
slug: Web/JavaScript/Reference/Global_Objects/DataView/getFloat16
page-type: javascript-instance-method
browser-compat: javascript.builtins.DataView.getFloat16
sidebar: jsref
---
The **`getFloat16()`** method of {{jsxref("DataView")}} instances reads 2 bytes starting at the specified byte offset of this `DataView` and interprets them as a 16-bit floating point number. There is no alignment constraint; multi-byte values may be fetched from any offset within bounds.
{{InteractiveExample("JavaScript Demo: DataView.prototype.getFloat16()")}}
```js interactive-example
// Create an ArrayBuffer with a size in bytes
const buffer = new ArrayBuffer(16);
const view = new DataView(buffer);
view.setFloat16(1, Math.PI);
console.log(view.getFloat16(1));
// Expected output: 3.140625
```
## Syntax
```js-nolint
getFloat16(byteOffset)
getFloat16(byteOffset, littleEndian)
```
### Parameters
- `byteOffset`
- : The offset, in bytes, from the start of the view to read the data from.
- `littleEndian` {{optional_inline}}
- : Indicates whether the data is stored in [little- or big-endian](/en-US/docs/Glossary/Endianness) format. If `false` or `undefined`, a big-endian value is read.
### Return value
A floating point number from `-65504` to `65504`.
### Exceptions
- {{jsxref("RangeError")}}
- : Thrown if the `byteOffset` is set such that it would read beyond the end of the view.
## Examples
### Using getFloat16()
```js
const { buffer } = new Uint8Array([0, 1, 2, 3, 4, 5, 6, 7, 8, 9]);
const dataview = new DataView(buffer);
console.log(dataview.getFloat16(1)); // 0.00001537799835205078
```
## Specifications
{{Specifications}}
## Browser compatibility
{{Compat}}
## See also
- [Polyfill of `DataView.prototype.getFloat16` in `core-js`](https://github.com/zloirock/core-js#float16-methods)
- [JavaScript typed arrays](/en-US/docs/Web/JavaScript/Guide/Typed_arrays) guide
- {{jsxref("DataView")}}
- {{jsxref("ArrayBuffer")}}
- {{jsxref("Float16Array")}}
|