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buffer: make byteLength throw on invalid input #8946

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buffer: make byteLength throw on invalid input #8946

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2 changes: 0 additions & 2 deletions doc/api/buffer.md
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Expand Up @@ -631,8 +631,6 @@ console.log(`${str}: ${str.length} characters, ` +
When `string` is a `Buffer`/[`DataView`]/[`TypedArray`]/[`ArrayBuffer`], the
actual byte length is returned.

Otherwise, converts to `String` and returns the byte length of string.

### Class Method: Buffer.compare(buf1, buf2)
<!-- YAML
added: v0.11.13
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2 changes: 1 addition & 1 deletion lib/buffer.js
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Expand Up @@ -369,7 +369,7 @@ function byteLength(string, encoding) {
return string.byteLength;
}

string = '' + string;
throw new TypeError('"string" must be a string, Buffer, or ArrayBuffer');
}

var len = string.length;
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12 changes: 8 additions & 4 deletions test/parallel/test-buffer-bytelength.js
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Expand Up @@ -7,10 +7,14 @@ const SlowBuffer = require('buffer').SlowBuffer;
const vm = require('vm');

// coerce values to string
assert.strictEqual(Buffer.byteLength(32, 'latin1'), 2);
assert.strictEqual(Buffer.byteLength(NaN, 'utf8'), 3);
assert.strictEqual(Buffer.byteLength({}, 'latin1'), 15);
assert.strictEqual(Buffer.byteLength(), 9);
assert.throws(() => { Buffer.byteLength(32, 'latin1'); },
'"string" must be a string, Buffer, or ArrayBuffer');
assert.throws(() => { Buffer.byteLength(NaN, 'utf8'); },
'"string" must be a string, Buffer, or ArrayBuffer');
assert.throws(() => { Buffer.byteLength({}, 'latin1'); },
'"string" must be a string, Buffer, or ArrayBuffer');
assert.throws(() => { Buffer.byteLength(); },
'"string" must be a string, Buffer, or ArrayBuffer');

assert(ArrayBuffer.isView(new Buffer(10)));
assert(ArrayBuffer.isView(new SlowBuffer(10)));
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