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Showing content from http://developer.mozilla.org/en-US/docs/Web/API/TextDecoder/TextDecoder below:

TextDecoder: TextDecoder() constructor - Web APIs

TextDecoder: TextDecoder() constructor

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The TextDecoder() constructor returns a new TextDecoder object.

Syntax
new TextDecoder()
new TextDecoder(label)
new TextDecoder(label, options)
Parameters
label Optional

A string identifying the character encoding that this decoder will use. This may be any valid label.

Defaults to "utf-8".

options Optional

An object with the following properties:

fatal Optional

A boolean value indicating if the TextDecoder.decode() method must throw a TypeError when decoding invalid data. It defaults to false, which means that the decoder will substitute malformed data with a replacement character.

ignoreBOM Optional

A boolean value indicating whether the byte order mark will be included in the output or skipped over. It defaults to false, which means that the byte order mark will be skipped over when decoding and will not be included in the decoded text.

Exceptions
RangeError

Thrown if the value of label is unknown, or is one of the values leading to a 'replacement' decoding algorithm ("iso-2022-cn" or "iso-2022-cn-ext").

Examples
const textDecoder1 = new TextDecoder("iso-8859-2");

const textDecoder2 = new TextDecoder();

const textDecoder3 = new TextDecoder("csiso2022kr", { fatal: true });
// Allows TypeError exception to be thrown.

const textDecoder4 = new TextDecoder("iso-2022-cn");
// Throws a RangeError exception.
Specifications Browser compatibility See also

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