合并所有数据，直到JavaScript中遇到分号为止

Question

I am trying to merge all the data in multiple lines until I encounter semicolon (;).

input

1
09;

8
9;

10
9;

1
00
;

2
0;

output

109
89
109
100
20

How do I achieve this using JavaScript?

This data is not static but dynamic, data is coming in real-time and I need to process one data values until semicolon and push it to browser front-end using sockets. so I am not in need to process all data at once and then push it.

Doing this:

console.log("before: ",receivedData);
console.log("after: ",receivedData.split('\n').join('').split(';').join('\n'));

results in :

after:
before:  2
after:  2
before:  05
after:  05
before:  ;
after:

before:

after:
before:  2
after:  2
before:  12
after:  12
before:  ;
after:

new data comes in every half a second (500ms). I am not sure if its too fast for thing to process? its just real-time I guess so there is no time for computation?

Answer 1

The code you are looking for is probably somthing like that:

 var buffer = ''; function process(data){ var separatorIndex; while((separatorIndex = data.indexOf(';')) !== -1){ send(buffer + data.substr(0, separatorIndex)); buffer = ''; data = data.substr(separatorIndex + 1); } buffer += data; } function send(data){ console.log(data); } process('123'); process('456;789;123'); process(';'); 

If you could accumulate all data and transform it at once, test.replace(/[^0-9;]|;$/g, '').replace(/;/g, '\\r\\n') should do the trick. The first regexp removes everything which is not a number or a semicolon (and just in case the semicolon at the end), the second call replaces all semicolons by line breaks.

Answer 2

Add a string representing your data. Remember to escape (use backslashes) at the end of every line to make it run on (alternatively, use a string template, as I have done below:)

const data =`
1
09;

8
9;

10
9;

1
00
;

2
0;`
const target = []; //Where our results will end up.

Then, use a for loop over the data:

var current = 0;
for (var iterator = 0; iterator > data.length; iterator++) {
    if (!target[current]) {target[current] = '';}
    if (data[iterator] != ";" && data[iterator] != "\n") {
        target[current] += data[iterator]; //Add current data to the target
        continue; //Continue the loop.
    }  
    else if (data[iterator] == ";") {
         current++; //Add one to current, so that further text ends up in the next index
         continue; //Continue the loop.
    }
    else {
         continue;
    }
}

Of course, this isn't efficent , but it will work, and if you are new to JS, you will be going down this route. String manipulation is a task with varying difficulty levels. You can also use regular expressions or .join and .split chains to achieve the same as this loop.

Answer 3

Remove all the whitespace, then split on ;

 var str =`1 09; 8 9; 10 9; 1 00 ; 2 0;` var res = str.replace(/\\s/g, '').split(';').join('\\n') console.log(res)