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code cleanup #19896

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code cleanup #19896

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ce30b27
stream: highWaterMark checks fix
Apr 10, 2018
1d461cb
stream: removed parentheses and changed comparison operator to <= in …
Apr 11, 2018
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6 changes: 2 additions & 4 deletions lib/_stream_readable.js
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Original file line number Diff line number Diff line change
Expand Up @@ -310,9 +310,7 @@ function chunkInvalid(state, chunk) {
// needReadable was set, then we ought to push more, so that another
// 'readable' event will be triggered.
function needMoreData(state) {
return !state.ended &&
(state.length < state.highWaterMark ||
state.length === 0);
return !state.ended && state.length <= state.highWaterMark;
}

Readable.prototype.isPaused = function() {
Expand Down Expand Up @@ -434,7 +432,7 @@ Readable.prototype.read = function(n) {
debug('need readable', doRead);

// if we currently have less than the highWaterMark, then also read some
if (state.length === 0 || state.length - n < state.highWaterMark) {
if (state.length - n < state.highWaterMark) {
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Please note that state.highWaterMark, state.length and n maybe equal 0. So if they all equal 0, state.length - n < state.highWaterMark doesn't equal to state.length === 0 || state.length - n < state.highWaterMark.

I suggest that this change would be with another PR because code cleaning shouldn't change code logic.

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Nice catch @MoonBall

doRead = true;
debug('length less than watermark', doRead);
}
Expand Down