JSON: filter matching values from array

Question

How I can match every articles object which are containing the matching values from the "tags" array, for example if I want to only list the articles which containing "foo" and "bar" keywords?

[
  {
    "articles": [
      {
        "_id": "0",
        "body": "This is a test article 1.",
        "tags": [ "foo", "bar" ]
      },
      {
        "_id": "2",
        "body": "This is a test article 2.",
        "tags": [ "baz", "bam" ]
      },
      {
        "_id": "4",
        "body": "This is a test article 4.",
        "tags": [ "foo", "bar", "baz", "bam" ]
      }
    ]
  }
]

Here is the router in my Express app which is calling this JSON file:

router.get('/:tag', function (req, res, next) {
  fsAsync(function(err, data) {
    var articles = data[0].articles.reverse();

    var q = articles.filter(function (article) {
      return article.tags === req.params.tag;
    });

    var json = [{ articles: q }];

    // I want the results here
    console.log(json);

    res.render('blog-tag', {
      layout: 'main',
      data: json
    });
  });
});

powerc9000 · Accepted Answer · 2016-02-16 22:28:27Z

1

See if the tag is in the array.

var q = articles.filter(function (article) {
  var tagInArray = false;
  article.tags.forEach(function(tag){
      if(tag === req.params.tag){
         tagInArray = true;
      }
  });
  return tagInArray;
});

IndexOf

answered Feb 16, 2016 at 22:28

powerc9000

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Comments

Muhammad Ali · Accepted Answer · 2016-02-17 12:54:28Z

0

Tags are in Array

 var q = articles.filter(function (article) {
 for (var i = 0;i<article.tags.length;i++){
 if(article.tags[i] === req.params.tag)
 return article.tags === req.params.tag;
 }
});

edited Feb 17, 2016 at 12:54

answered Feb 16, 2016 at 22:28

Muhammad Ali

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1 Comment

Lanti Over a year ago

This code seems more simple, but unfortunately not working for me. Returning only [] in the console. :(

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