CODEWITHSUNDEEP
node.js
Mohamed Naguib
Mohamed Naguib

Reputation: 1730

Split and count words in string Node JS

If I have two strings like those

s1 = "This is a foo bar sentence ."
s2 = "This sentence is similar to a foo bar sentence ."

And I want to split the string to be in this format

x1 = ["This":1,"is":1,"a":1,"bar":1,"sentence":1,"foo":1]
x2 = ["This":1,"is":1,"a":1,"bar":1,"sentence":2,"similar":1,"to":1,"foo":1]

It split the string words and count them, to a pair of where each string represent a word and the number represent the count of this word in the string.

Upvotes: 1

Views: 7752

Answers (1)

Tomalak
Tomalak

Reputation: 338158

Remove punctuation, normalize whitespace, lowercase, split at the space, use a loop to count word occurrences into an index object.

function countWords(sentence) {
  var index = {},
      words = sentence
              .replace(/[.,?!;()"'-]/g, " ")
              .replace(/\s+/g, " ")
              .toLowerCase()
              .split(" ");

    words.forEach(function (word) {
        if (!(index.hasOwnProperty(word))) {
            index[word] = 0;
        }
        index[word]++;
    });

    return index;
}

Or, in ES6 arrow-function style:

const countWords = sentence => sentence
  .replace(/[.,?!;()"'-]/g, " ")
  .replace(/\s+/g, " ")
  .toLowerCase()
  .split(" ")
  .reduce((index, word) => {
    if (!(index.hasOwnProperty(word))) index[word] = 0;
    index[word]++;
    return index;
  }, {});

Upvotes: 8

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