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function stringToArrayBuffer(str) {
const encoder = new TextEncoder();
return encoder.encode(str).buffer;
}
const myString = "Hello world!";
const myArrayBuffer = stringToArrayBuffer(myString);
console.log(myArrayBuffer);
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if (!("TextEncoder" in window))
alert("Sorry, this browser does not support TextEncoder...");
var enc = new TextEncoder(); // always utf-8
console.log(enc.encode("This is a string converted to a Uint8Array"));