JavaScript code to filter out common words in a string

Question

I\'m trying to build JavaScript code that reads one string (say a sentence of English text), then outputs another string of (comma-separated) words that were \"uncommon\". S

Answer 1

Build an associative array of common words first, then tokenize sequence to output any words not contained in it. E.g.

var excluded = new Object();
common_words = common_words.split(",");
for (var i in common_words) {
    excluded[common_words[i].trim().toLowerCase()] = true;
}
var result = new Array();
var match = sentence.match(/\w+/g);
for (var i in match) {
    if (!excluded[match[i].toLowerCase()]) {
        result.push(match[i]);
    }
}
var uncommon_words = result.join(", ");