英文:
Javascript: String comparison returns true although the strings are different (intermittent issue)
问题
我正在使用WritableStream以块的方式处理数据。解码后的数据是一个JSON字符串，如果以,开头，我需要删除逗号。
但问题在于，当块被解码为字符串后，我会检查第一个字符
const startsWithComma = chunk.at(0) === ',';
有时它会返回true，尽管块并不以,开头，这会导致后续的JSON.parse失败。请参见附加的图片。
我尝试过的方法：
- 使用
.at()的替代方法，如.charAt()、.startsWith()、chunk[0]
问题是间歇性的，意味着有时它可以处理整个数据，有时可能会在中途失败。
英文:
I'm processing the data in chunks using WritableStream. The decoded data is a json string and in case it starts with , I need to remove the comma.
But here's the problem, after the chunk is being decoded to string I'm checking the first character
const startsWithComma = chunk.at(0) === ','
and SOMETIMES it returns true although the chunk doesn't start with , and causes the JSON.parse to fail later on. See the attached image.
Things I tried:
- used
.at()alternatives like.charAt(),.startsWith(),chunk[0]
The issue is intermittent meaning sometimes it can process the entire data and sometimes might fail mid through.
答案1
得分: 1
所以，扩展我的评论：
从你的图片来看，是否有可能在逗号被移除之后才运行调试？也有可能这个块可能以多于1个逗号开头，所以有时在这个确切位置进行调试仍然会显示一个逗号？
解决方案是使用类似以下的 while 循环去掉逗号：
while (chunk.at(0) === ',') {
chunk = chunk.slice(1).trim();
}
现在我不知道如果 isFirstChunk 而做这个的原因，所以我会不管它，但上面的循环应该解决你的 startsWithComma 问题 
英文:
so, expanding on my comment:<br>
> from your image, is it possible that the debug is running after the comma was already taken out? is it also possible that the chunk may begin with more than 1 comma so sometimes debugging at that exact spot would still show a comma?
The solution would be to take off the commas using a while loop such as
while( chunk.at(0)===',' ){
chunk = chunk.slice(1).trim();
}
now I do not know the reason for doing it if isFirstChunk so I'd leave that alone, but the above loop should solve your startsWithComma issue
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