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buffer: improve Buffer.from performance #15178

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buffer: improve Buffer.from performance #15178

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6 changes: 3 additions & 3 deletions lib/buffer.js
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Original file line number Diff line number Diff line change
Expand Up @@ -193,7 +193,7 @@ Buffer.from = function from(value, encodingOrOffset, length) {
if (isAnyArrayBuffer(value))
return fromArrayBuffer(value, encodingOrOffset, length);

if (value == null) {
if (value === null || value === undefined) {
throw new errors.TypeError(
'ERR_INVALID_ARG_TYPE',
'first argument',
Expand All @@ -208,7 +208,7 @@ Buffer.from = function from(value, encodingOrOffset, length) {
);

const valueOf = value.valueOf && value.valueOf();
if (valueOf != null && valueOf !== value)
if (valueOf !== null && valueOf !== undefined && valueOf !== value)
return Buffer.from(valueOf, encodingOrOffset, length);

var b = fromObject(value);
Expand Down Expand Up @@ -322,9 +322,9 @@ function allocate(size) {
function fromString(string, encoding) {
var length;
if (typeof encoding !== 'string' || encoding.length === 0) {
encoding = 'utf8';
if (string.length === 0)
return new FastBuffer();
encoding = 'utf8';
length = byteLengthUtf8(string);
} else {
length = byteLength(string, encoding, true);
Expand Down