CODEWITHSUNDEEP
javascriptarraysmapping
Stuart Brown
Stuart Brown

Reputation: 987

Mapping values from two arrays

I am using a text analysis service (pos) which I can pass a string at it tells me whether than string contains verbs, nouns etc.

I have code:

var words = new pos.Lexer().lex(req.body.Text);
var tagger = new pos.Tagger();
var taggedWords =  tagger.tag(words);

taggedWords is then passed to a handlebars template and looped through and printed.

If I console.log(taggedWords) I see a multidimensional array eg:

[ 
  [ 'Interest-only', 'RB' ],
  [ 'deals', 'NNS' ],
  [ 'allow', 'VB' ],
  [ 'only', 'RB' ],
  [ 'ends', 'NNS' ],
  ...
  ...
]

I would like to maintain a separate array which maps the values in the above array to human-readable version:

[
  ['RB', 'adjective'],
  ['NNS', 'noun'],
  ['VB', 'verb'],
  ...
  ...
]

and then be able to rewrite so that the original array (taggedWords) looks like:

[ 
  [ 'Interest-only', 'adjective' ],
  [ 'deals', 'noun' ],
  [ 'allow', 'verb' ]
]

and then pass this new array to my template. What is the most efficient way to do this?

Upvotes: 0

Views: 448

Answers (3)

sam k
sam k

Reputation: 1107

Brute force method would involve going through all the elements in the arrays and find a match for them in another array and push them into a third array. This will require that you don't have the same tag word in an array twice; ie: 'RB', or 'NNS'. Hope this solves your problem for now. The benefits to this method as apposed to the previous answer would be that the order of items in arrays don't matter since you're comparing each element to every other element in the other array.

let array1 = [ 
  [ 'Interest-only', 'RB' ],
  [ 'deals', 'NNS' ],
  [ 'allow', 'VB' ],
  [ 'only', 'RB' ],
  [ 'ends', 'NNS' ]
];

let array2 = [ 
  ['RB', 'adjective'],
  ['NNS', 'noun'],
  ['VB', 'verb'],
];

let array3 = [];

array1.forEach(el => 
{
    array2.forEach(par =>
  {
    if (el[1] === par[0])
    {
        array3.push([el[0], par[1]])
    }
  })
});
console.log(array3);

Upvotes: 0

Herohtar
Herohtar

Reputation: 5613

You can use map() to create a new array with modified elements from your original. This code changes the second item in each tagged word to what is listed in the dictionary for that tag.

let taggedWords = [ 
  [ 'Interest-only', 'RB' ],
  [ 'deals', 'NNS' ],
  [ 'allow', 'VB' ],
  [ 'only', 'RB' ],
  [ 'ends', 'NNS' ]
];

let dict = [
  ['RB', 'adjective'],
  ['NNS', 'noun'],
  ['VB', 'verb']
];

let result = taggedWords.map(tag => {
  tag[1] = dict.find(item => item[0] === tag[1])[1];
  return tag;
});
console.log(result);

Upvotes: 1

romph
romph

Reputation: 487

var taggedWords = [ 
                [ 'Interest-only', 'RB' ],
                [ 'deals', 'NNS' ],
                [ 'allow', 'VB' ],
                [ 'only', 'RB' ],
                [ 'ends', 'NNS' ]
              ];
    
var dico = {
  'RB' : 'adjective',
  'NNS' : 'noun',
  'VB' : 'verb'
};
taggedWords.forEach( elt => { elt[1] = dico[elt[1]] });
console.log(taggedWords);

Upvotes: 1

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