Word frequency in Javascript

Blogging helpful tech tips, how-to tutorials since 2020

Code

Here is the solution code:

countWords(text) { //Edge case: an empty array if (text.length === 0) { return {}; } //Normalize words text = text.toLowerCase(); /* regular expression to tokenise by word while ignoring punctuation. */ const pattern = /\w+/g; text = text.match(pattern); let wordsOccurence = {}; /* Output an object with results. */ wordsOccurence = text.reduce((wordsOccurenceMap, word) => { if (Object.hasOwnProperty.call(wordsOccurence, word)) wordsOccurence[word] = 1; else wordsOccurence[word] += 1; return wordsOccurence; }, {}); return wordsOccurence; }

Main Methods

Normalizing text to lower case string

You can see that the text we passed to the functions can be normalized by converting to lower case. This is fully customizable that is if you can consider the upper case and lower case separately by updating the code.

Tokenising words by Regular Expressions

Another main step is to ignore the punctuations or other symbols from using regular expressions. In our current scenario, we're only taking alphabets for consideration by ignoring all others.

I'll suggest using something like Regex101 for testing out your regular expressions.

Reduce words counts into an object

Here, we are using JS reduce function to create JS object of words count.

{ 'Hello':3, 'World':1 }

We created a tool to get the word frequency, please check here.

Conclusion

That's all for now. I hope you got the javascript code solution for creating word frequency. Please like and share this article. Feel free to use the comment option below to give your opinions.

Let's Connect with Makeinfo. Our vision is to create a productive workflow using existing solutions. If you follow us, then you can definitely notice that we are trying our best efforts to make productive solutions with few clicks.

Count words frequency using Javascript

Comments

Coding Challenges

Codesignal Challenge - fileNaming

More from this blog

The Main Issues of Using the Shopify Forms App

Top Free Social Media Monitoring in 2025

Why Turning Google Sheets into a Website Is a Game-Changer

Infinite Suggest: The Ultimate Free Google Keyword Suggestion Tool by RankTank

6 Useful Claude Code YouTubers Every Developer Should Follow

Code

Main Methods

Conclusion

Command Palette

Comments

Coding Challenges

Codesignal Challenge - fileNaming

More from this blog

Code

Main Methods

Conclusion