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Strings · medium

34. Text Encoding & Hex Manipulation

TextEncoder, TextDecoder, and hex conversion.

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`TextEncoder` converts strings to UTF-8 `Uint8Array` bytes; `TextDecoder` converts them back. Converting bytes to hex requires byte padding.

js
const bytes = new TextEncoder().encode("hello");
const hex = "0x" + Array.from(bytes, b => b.toString(16).padStart(2, "0")).join("");

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  2. 2. Re-read the code snippets and say out loud what each line does.
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Check your understanding

  1. 1. What does TextEncoder.prototype.encode() return?

  2. 2. How many hexadecimal characters represent a single byte?

  3. 3. Why padStart(2, '0') when converting byte to hex?

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