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UTF-8 Byte Length

Easy · Buffers

str.length counts UTF-16 code units, not bytes. When you send text over the network, what matters is its size in bytes. In Node you would use Buffer.byteLength(str, "utf8").

Write a function byteLength(str) that returns how many bytes str takes in UTF-8.

Buffer is not available here, but TextEncoder is: new TextEncoder().encode(str) returns a Uint8Array with the UTF-8 bytes.

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