Function Overloading or Pattern Matching of functions in Ecma

bishwendu kundu bishwenduk029 at
Mon Oct 22 07:08:00 UTC 2018

Hi Kai Zhu,

I agree with you the new proposition should be of value to a web developer
in daily work. If we observe the pattern it more closely resembles a more
declarative form of solution implementation which is easy to code and
understand. For example lets consider below piece of code:
function sum_list(input, result){
        return result;
    [head, ...input] = input;
    return sum_list(input, result + head);
Now the same code in the new proposal form

function sum_list([head, ...tail], result){
    result = result + head;
    return sum_list(tail, result);

function sum_list([], result){
    return result;

This declarative model of coding also forces an immutable form of state
management allowing for removing a family of bugs.

Thanks & Regards,

On Wed, Oct 17, 2018 at 12:57 PM kai zhu <kaizhu256 at> wrote:

> hi Bishwendu, javascript is first-and-foremost a tool designed for
> web-product-development, a growing field that has eclipsed low-level
> general-purpose programming (where jobs are harder and harder to find) in
> the IT industry.
> you need to give compelling reasons (for such significant language-change)
> why i, a web-developer would benefit from from having overloaded-functions
> in my (mostly expendable-code) web-projects, as opposed to creating
> confusion and maintennance-headaches, when i typically have to rewrite code
> multiple-times during the web-integration process.
> kai zhu
> kaizhu256 at
> On 17 Oct 2018, at 12:23 PM, bishwendu kundu <bishwenduk029 at>
> wrote:
> Hello All,
> I have been a great fan of the evolution of JavaScript in the recent past.
> The language is steadily closing the gap to ideal functional paradigm. One
> of the things that I have liked the most about languages like
> Erlang/Elixir/Haskell is their ability to define functions with same name
> and different airty. The decision of invoking the correct function-argument
> pattern is dependent on the invocation of the function. Implicit pattern
> matching in aforementioned languages helps avoid costly cognitive loads
> introduced by explicit if/else based pattern of logic flow branching.
> The greatest power of the pattern matching which amazed me was, dropping
> the whole of looping construct, altogether. Elixir/Erlang have no LOOPS.
> Stack based recursive calls combined with JavaScript's closures suddenly
> strikes me as a very powerful programming model that not only increases
> readability of code but also promotes immutability of the data structures
> in use. The loops would continue to exist but more modern codes can be
> written leveraging the recursive model of JavaScript.
> With de-structuring of arrays & objects already in place in JavaScript,
> pattern-matching of functions can fit right in perfectly, thereby taking
> JavaScript another step closer to ideal functional programming model.
> Looking forward to your response.
> Thanks & Regards,
> Bishwendu.
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