Why JavaScript Text-to-Binary Snippets Break on Emoji

The article discusses a method for converting text to binary code using JavaScript's TextEncoder and TextDecoder APIs, focusing on UTF-8 encoding. Here are key points from the article:

1. Using TextEncoder and TextDecoder:

   • The TextEncoder API converts Unicode strings into a sequence of bytes in a specified encoding (default is UTF-8).
   • The TextDecoder API decodes sequences of bytes back into Unicode strings.

2. Implementation Details:

   • To convert text to binary, the article suggests using TextEncoder.prototype.encode() which returns an array buffer.
   • This array buffer can then be converted to a string representation of binary digits (0s and 1s) by iterating through each byte and converting it to its binary form.

3. Handling Invalid Inputs:

   • The implementation should reject invalid inputs, such as malformed UTF-8 sequences or non-binary strings.
   • This is achieved using TextDecoder with the fatal: true option set, which throws an error when encountering malformed input rather than silently replacing it with a replacement character.

4. Testing:

   • The article emphasizes testing known outputs to ensure correctness beyond just

Read the full article at DEV Community

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