CSV Stringify 示例

回调

This source code for this example is available in "./samples/api.callback.js".

The stringifier receive an array and return a string inside a user-provided callback. This example is available with the command node samples/callback.js.

var stringify = require('csv-stringify');

input = [ [ '1', '2', '3', '4' ], [ 'a', 'b', 'c', 'd' ] ];
stringify(input, function(err, output){
  output.should.eql('1,2,3,4\na,b,c,d');
});

流

This source code for this example is available in "./samples/api.stream.js".

// node samples/stream.js
var stringify = require('csv-stringify');

data = '';
stringifier = stringify({delimiter: ':'})
stringifier.on('readable', function(){
  while(row = stringifier.read()){
    data += row;
  }
});
stringifier.on('error', function(err){
  consol.log(err.message);
});
stringifier.on('finish', function(){
  data.should.eql(
    "root:x:0:0:root:/root:/bin/bash\n" +
    "someone:x:1022:1022:a funny cat:/home/someone:/bin/bash"
  );
});
stringifier.write([ 'root','x','0','0','root','/root','/bin/bash' ]);
stringifier.write([ 'someone','x','1022','1022','a funny cat','/home/someone','/bin/bash' ]);
stringifier.end();

管道

This source code for this example is available in "./samples/api.pipe.js".

One usefull function part of the Stream API is pipe to interact between multiple streams. You may use this function to pipe a stream.Readable array or object source to a stream.Writable string destination. The next example available as node samples/pipe.js generate records, stringify them and print them to stdout.

var stringify = require('csv-stringify');
var generate = require('csv-generate');

generator = generate({objectMode: true, seed: 1, headers: 2});
stringifier = stringify();
generator.pipe(stringifier).pipe(process.stdout);

使用 "header" 选项

This source code for this example is available in "./samples/options.header.js". Run it with the command node ./samples/options.header.js.

var stringify = require('../lib');
var generate = require('csv-generate');

var generator = generate({objectMode: true, seed: 1, headers: 2});

var columns = {
 year: 'birthYear',
 phone: 'phone'
};
var stringifier = stringify({ header: true, columns: columns });

generator.pipe(stringifier).pipe(process.stdout);

The output on the console will start with:

birthYear,phone
OMH,ONKCHhJmjadoA
KB,dmiM
B,LF