javascript中的单词频率 [英] word frequency in javascript

问题描述

怎么能我实现了javascript函数来计算给定句子中每个单词的频率。

How can I implement javascript function to calculate frequency of each word in a given sentence.

这是我的代码：

function search () {
  var data = document.getElementById('txt').value;
  var temp = data;
  var words = new Array();
  words = temp.split(" ");
  var uniqueWords = new Array();
  var count = new Array();


  for (var i = 0; i < words.length; i++) {
    //var count=0;
    var f = 0;
    for (j = 0; j < uniqueWords.length; j++) {
      if (words[i] == uniqueWords[j]) {
        count[j] = count[j] + 1;
        //uniqueWords[j]=words[i];
        f = 1;
      }
    }
    if (f == 0) {
      count[i] = 1;
      uniqueWords[i] = words[i];
    }
    console.log("count of " + uniqueWords[i] + " - " + count[i]);
  }
}

我无法追查问题..任何帮助非常感兴趣。这种格式的
输出：
计数为 - 1
计数 - 2 ..

am unable to trace out the problem ..any help is greatly appriciated. output in this format: count of is - 1 count of the - 2..

输入：这是anil是kum the anil

input: this is anil is kum the anil

推荐答案

我觉得你有多个数组，字符串和频繁参与（并且很难）遵循循环和嵌套循环之间的上下文切换。

I feel you have over-complicated things by having multiple arrays, strings, and engaging in frequent (and hard to follow) context-switching between loops, and nested loops.

以下是我鼓励你考虑采取的方法。我已经在评论中概述了解释过程中的每一步。如果其中任何一项不清楚，请在评论中告诉我，我会重新审视以提高清晰度。

Below is the approach I would encourage you to consider taking. I've inlined comments to explain each step along the way. If any of this is unclear, please let me know in the comments and I'll revisit to improve clarity.

(function () {

    /* Below is a regular expression that finds alphanumeric characters
       Next is a string that could easily be replaced with a reference to a form control
       Lastly, we have an array that will hold any words matching our pattern */
    var pattern = /\w+/g,
        string = "I I am am am yes yes.",
        matchedWords = string.match( pattern );

    /* The Array.prototype.reduce method assists us in producing a single value from an
       array. In this case, we're going to use it to output an object with results. */
    var counts = matchedWords.reduce(function ( stats, word ) {

        /* `stats` is the object that we'll be building up over time.
           `word` is each individual entry in the `matchedWords` array */
        if ( stats.hasOwnProperty( word ) ) {
            /* `stats` already has an entry for the current `word`.
               As a result, let's increment the count for that `word`. */
            stats[ word ] = stats[ word ] + 1;
        } else {
            /* `stats` does not yet have an entry for the current `word`.
               As a result, let's add a new entry, and set count to 1. */
            stats[ word ] = 1;
        }

        /* Because we are building up `stats` over numerous iterations,
           we need to return it for the next pass to modify it. */
        return stats;

    }, {} );

    /* Now that `counts` has our object, we can log it. */
    console.log( counts );

}());

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