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Dr. Axel Rauschmayer is a freelance software engineer, blogger and educator, located in Munich, Germany. Axel is a DZone MVB and is not an employee of DZone and has posted 246 posts at DZone. You can read more from them at their website. View Full User Profile

What Are the Most Popular JavaScript Keywords? and What This Means for ECMAScript 6

03.20.2012
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Ariya Hidayat has used his Esprima parser to count the most popular keywords in a corpus of JavaScript libraries.

The five most popular ones are (by far):

  • 19.2%: this
  • 18.5%: function
  • 18.2%: if
  • 17.1%: return
  • 12.6%: var
Quoting a comment by Thomas Fuchs:

As an interesting aside, CoffeeScript eliminates two out of the first five completely (return and var), and has much shorter ways to express function (->) and this (@).

Functional-programming-style implicit return of the last value in a block is indeed a good idea and will probably make it into ECMAScript 6 in one form or another. One should not forget that the brain recognizes tokens, not characters, which means that for reading code (which is much more important than writing code), shorter tokens don’t matter much. That being said, a shorter function notation will probably also be part of ECMAScript 6 and is appreciated. I do like that JavaScript has a keyword for declaring variables (var now, let soon), because that helps with checking for typos.

For more information, including a diagram of the distribution of the keywords, consult Ariya Hidayat’s article.

Published at DZone with permission of Axel Rauschmayer, author and DZone MVB. (source)

(Note: Opinions expressed in this article and its replies are the opinions of their respective authors and not those of DZone, Inc.)

Comments

Techni Space replied on Tue, 2012/03/20 - 6:50am

Quiet interesting

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